Thanks Jehu for the video. When powered over USB you can just play with the menu for the Parameter settings to be saved it will need to be connected to a battery as the main IC the ISL94203 is not powered when on USB power and all those parameter settings are saved directly inside the ISL94203 EEPROM and then it will need a power cycle as at power up ISL94203 will load the EEPROM content in to a working RAM memory. I think for most the new low cost SBMS0 is the best solution as it is just around $120 and it has all the future's of this other chargers including the BMS with cell balancing and LCD with all the energy logging futures (will internally log last year of data and it can be downloaded over serial) but is just missing the PV charger functionality that can easily and inexpensively be done with an external DC SSR controlled by SBMS0 or if you want one of the Victron MPPT Smart solar as they have a remote ON/OFF port that will integrate with SBMS0 Any inverter up to 12KW can be used with SBMS0 as SBMS0 will be used with up to a 500A 75mV external current shunt. The inverter will need to support remote ON/OFF (most do) like Victron, Cotek and I use the low cost PIP2424 all this and other support remote ON/OFF or can be made to but not all (you can ask me if not sure). All my projects are open source so if you have the knowledge you can build an SBMS yourself but if you only need one or two then it will be much more cost effective to get one from me.
i will like to get this for my 18650 14s 80p power wall, i am running my home whit this. so i will need to run 2 of this BMS on series? oh i am building 14 more packs so i can be on the 20k range what you can recommend ? by the way thank you for your work and jehu for be a O.C.D. Freak! On Building DiY Stuff lol
While it is possible to use two SBMS0 for a 14s 48V setup is not that elegant as there will be two SBMS0 each with is own LCD and is own current shunt both showing almost the same thing. Assuming those are 2Ah cells you will have a 160Ah 51.8V = 8.22kWh pack and that is not particularly large. Even a 20kWh pack can be on 24V as typical charge rate should be around 0.2C for long battery life and discharge is typically less than 0.5C. Since SBMS supports an external up to 500A current shunt that means loads of up to 12kW can be connected. One of the larger systems made with SBMS that I know of is an offgrid setup with a 8s3p LiFePO4 25.6V 900Ah = 23kWh and it has 3x 3000W Victron inverters in parallel for 9000W AC
Hi Dacian :) I have the SBMS 100. Great product, great support. Really smart developer. And this product is built to last. If I remember correctly I think the design was created with a 25 year life expectancy on the hardware. Pretty impressive. Keep up the good work. Thanks.
Hello, I think this might be the perfect product for our home. Been looking for a BMS / charge controller with adjustable battery charge voltage cut off. QUick question: if I have a 18650 Battery and I want a 12 v system and limit the charge to 4v for battery longevity, would you recommend running at 3s or 4s set up with this device? Many thanks and wonderful product!
Timing is amazing. Just yesterday watched a build of a DIY solar generator using this solar controller and BMS. I am planning my build and was bummed this won't be available until 5+ months from now.
I just went on his kickstarter and pledged for the SBMS0, exactly what I needed. I actually will be using a Victron charge controller, wanted that for the Bluetooth.
I’m sure you have plenty on your plate, but have you reached out to the creator perhaps at some point you could license the software and design from the creator so others can purchase what that needed to build their own. Maybe even release a board in your own form factor that can utilize the ElectroDacus software. Not for free of course but something mutually beneficial. Either way get some control of release and production for use with your solution; it’s seems perfect.
Glad you got to get a review out on this amazing product with loads potential! I hope this helps get him to his Kickstarter goal so he can start mass production!
you have not done this bms any justice you should do a full vid and a build just to show what this can do it should be mass produced in china so that thousands can be made and all can get there hands on one. of course ElectroDacus should be fully compensated for all his hard work and years of time he has put into this project very cool product very big like.
Jehu Garcia, you're a saint. Honestly. You are working hard to give something that does not come easily to many. Watch out for lizard people. They like round Earth money.
Will this work with 2 Tesla batteries, either in series or parallel? How many would I need for the 2 batteries and what size? Thanks for the great video and information.
Hey Jehu >> I'm way behind but I won't lose track of you again..... A Power Wall is something EVERYbody needs whether they know it or not..... lol, I desperately need all the help I can get on this journey. I want to CUT the Electric Company out of the equation. Batteries have been the problem & I thank you for the heads up on all the components too. I'm getting ready to set-up a Hydroponic Garden whereas I've got fish growing & the waste feeds the plants as they filter the water for the next cycle. OFF the Grid is the only way to go..... I'm with you, so glad you're doing this and I need help sizing & other stuff...... thanks man
For many / most people generating your own power can be more expensive than the Grid. You will need a huge power wall to run an ALL ELECTRIC home - especially in the winter time when there is no sun for many consecutive days and it is below zero outside. The average home consumes 30 kilowatt-hours per DAY !!!
I watched ur videos I like it and I need 700-800 w portable solar generator for cooking and other household purposes while camping can u suggest what type,brand and size of solar panel and solar generator to buy and the solar panel should fit in my sedan car. And I'm in india
William I bought 32 cells of Yinlong Lithium 66160h 2.3v Titanate & the BMS I got their processing still was DYKB 7S - 20S Smart Bluetooth 80A , 100A , 320A , 300A , 400A lithium Ali-ion Lipo LifePo4 Battery BMS protection board 48v , 36v , 24v , 16S I ordered 2 “ I could not find what you had recommended on Ali Express ! Was this a good choice ? I lost the link to buy them through you , although I did message the sellers I was vying because of you DIY Willian
You need to avoid the cheap,cheap battery mismanagement systems! I been looking in to Dacians BMS. Just didn't know how to get it... Lost touch with him he has some really good ideas and systems..
Does this negate the need for a solar charger? When buying a bms what is the "amp rating" relating too? the charging max amps the battery is outputting or the max amps the bus can handle from the solar system? Thank you for you videos and you time if you answer this question!
I was trying to decide on whether or not to use a commercial BMS. I assume any BMS will have a current drain on each cell to achieve balancing. My voltage regulator limits charging voltage to 14.5v. On a 12v 4 cell LIFEPO4 battery, I think I can get by with 4 x 330 OHM resistors as a voltage divider between cells, which will have a 10ma drain and passively balance each cell to the same voltage.
what is the current status of these BMS units? The URL has no info on buying, just people complaining that they didn't receive the orders. I would love to use one of these for my S20 72v pack, I'm ready to buy but no idea the state of where we are with this unit.
Jehu you should do a vlog on adding this bms to your vw van so it’s battery doesn’t die in only a couple years it will last 10 years with 90% range capacity
MrSummitville For high amp protection, you connect each cell with a solid bare wire than will melt when more than X (5 or 10?) amps tries to pass thru it at any given instant.
Thanks! Something like this is an overkill if you already have a solar inverter with MPPT controller included or it goes well with it as a middle point BMS for the pack?
Did this thing die? It doesn't look like its still viable on the links provided. Seems like a really fantastic idea.. combining BMS and balancing with charging is ideal..
Jehu, when are you gonna, do a hook up a test which the SBMS? Really enjoying your videos also learning a lot from and other RUclipsrs although am late on some of your videos due to work I may be the only person in Jamaica that is trying to do something different started gathering cell even tho it's hard to do so look to buy from you guys at some point starting small for my first project hopefully will be a portable power pack just to like charger my phone and run maybe an led light it the case of an outage for the day. Thanks for the great content.
hi garcia, ive watch a few of your vids and u seem like a very knowledgeable person using these batteries, but i have to add something that ive noticed has never actually been mentioned, now we all know that 18650 cells are different in chemistry and milli-amps, (1) if u over charge a 18650 battery it releases the top vent(built under the cap) and shuns off the over charge pressure which can result in the battery going bad(never seen you guys mention that) (2) when packing multiple 18650 cells, lets say 80 in 1 pack thats 4/20, we do not have all cells at the same charge capacity(even if the cells are new from factory, so when they charge as soon as 1 reaches full the power is vented off to the other battery that's not full, ive tested this theory of the repackr method against just randomly putting known good cells in a pack and they both charge excellent, what i do notice is u guys say u want each cell being as close in milli amps as possible which is a very wise choice in my opinion but i myself have done tests where a cell varies off buy 1amp and it does work flawless when charging using my solar panels, so the repackr to me is not a must, but its a good thing still, (3) ive seen you show the concept of buss bars and ive never seen anyone explain why using certain thickness in bus bars can lead to under charging or low power output,wires are rated in ohms to carry a certain amount of power, and when using 12v, 24v, 48v etc etc the wires are rated differently. i could go on about a few stuff but i'll leave that for some other time, cheers
Dacian has the SBMS0 which is a unit like the 120 and 40 only without the ability to take the power from your PV panels and put it into the battery. What he has now is the DSSR20 which is basically a charge controller for 2 PV panels that you run to your battery bank. That means every two panels are independent. If you have 12 panels and one gets shaded only that pair will stop making power the other 10 panels will continue to send power to the battery bank. The closest thing I can compare it to is a mini inverter but for your battery bank. The other thing is they are for lithium batteries so they charge to the set point and stop charging as lithium batteries only want constant current and then nothing. This system will extend the life of your battery big time. If you are using a system that give the three levels of charge like float etc then you are hurting your lithium batteries and most people do not even know it. Stop using any other charger system for your lifepo4 batteries because you are shortening their life. This is for a 24v off grid system and it works perfectly. you will save so much money and kick yourself for not doing this sooner.
Hey there Jehu. I was wondering. Can you use for instance a 4S 5P BMS (18650) in a 3P configuration? Then add the other 2P later? Like a day or so? Or does the whole BMS need to be populated for it to work??? My goal is a 4S 14.8v board that hopefully I can expand later to increase the amperage/storage.Thank you!
I'm confused...If you go to the kickstarter page and look at the comments you will see someone asked if this BMS will work well with reclaimed 18650's. ElectroDacus responded that nothing works well with reclaimed 18650's and that when new, their expected cycle life is only 500 cycles. He stated that this would protect them from over charge and overdischarge but not be able to balance very well. The exact quote was "In any case SBMS (any models) will work with any type of Lithium cells is just that I do not recommend wasting time with reclaimed 18650." I find it odd that this wasn't mentioned in the video.
if you have a SMART BMS in your ebike battery pack... Do you need a separate BMS if the ebike battery is charged by a GVB-8 LI-MPPT-boost/charge controller connected to the Solar panel.
Thanks for your informative videos. All we need is for you to get to the point where you develope and market a Plug & Play Solar System for the average Joe, upscalable of course. Wreaking terror on the utility companies that hold their monopolies in many states. We are not there yet, but we are slowly, but steadily marching in that direction. We are still stuck in "research and developement" stages. The next Elon Musk will have Plug and Play available for say lighting systems and perhaps whole house power generation. Let's pool our knowledge, so we can speed up the plug and play reality, we have less than a 100 years each, to make our "mark/difference".
Hello thank you for your quite informative channel I would like some information, I cannot understand how to choose my BMS as an example I made a 12v 3S4P battery with 12 18650 batteries (recovery from 2.5ah to 1.8ah) to operate a 20w led ... I understand for the 3S but how to determine the current (A) of the BMS? knowing that the led consumes about 1.6ah ... thank you so much
Hello Jehu, I’m planning to build an off-grid solar system with +/- 4KW battery (24V). You offer a number of components which I’m looking for. A few questions: Do you ship from your shop to Belgium? Can I use a grid tie converter for an off-grid system? Thanks for your reply.
Thanks so much for the video! I was wondering about the following: if I want to connect 12 3.2V 100ah cells to produce a 12V 300ah battery, how would I ideally connect a BMS? Will I connect a BMS for each of the 12V 100ah batteries and then another one for the battery as a whole? Or just for each of the 12V 100ah batteries? Or just for the battery as a whole? Thanks so much!
If each BMS does only 100 Amps then you would design three different 4S1P batteries and then connect those three batteries in parallel using 3 @ 100 AMP FUSES ...
Hello sir, as a newcomer to the building of lithium ion batteries I have stumbled across a problem you may be able help with please if not too much trouble, I have built a 3s 8p battery and went down the path of installing PREBUILT BMS`s onto them, my BMS was attached to the end of the battery and connected to the cells as I was advised, on completing them and having a I noticed on each BMS some of the components were getting ridiculously hot to the point they were untouchable, is it possible I have wired the BMS up wrongly and would you consider them now to be burnt out and useless? many thanks and eagerly awaiting your reply,
@electrodacus, I’m new to this but have been reading for a few months. I have access to a few large (ones that go on the roof of the house, maybe 200-300W) PV solar panels and want to hook them up in my back yard to run some hydroponics pumps and to charge some power tool batteries (120V AC). I will probably add more panels later as well. I’m not sure what kind of batteries I will use, but I’m leaning towards building them with 18650’s and Jehu’s PCB kit. I like the idea of have an all in one integrated unit without having to buy any separate inverters or anything else. Does it sound like the SBMS120 is the right unit for me to buy? I’m hoping you can reply soon so I can join the Kickstarter. Thanks!
Hey Jehu I love all your videos and the information you share.. when will your kits become available again? I have emailed you but have yet to get a response. I want to build my own and your kit would make it so much easier to get going.
I watch your videos for a short time and i love it .... you do a great job.... i love your system for the battery packs ... 🤗🤗🤗😎😎 very very good... The vruzend system is also great but yours is a bit more prof. Very good 🤙🤙☝️ Greets grom Austria in Europe
Hey, I am having problem with LiFePo4 battery pack 10A BMS. It cut off due to my 300w inverter capacitor charging even when its drawing 15w only. I am thinking of using BMS for charging and another way for 20A discharging. What battery protect system should I use, Victron BP-65 is not easily available & is expensive in India.
Hi Jehu ,I'm interested in your dig power wall but I can't find the right link that will bring me to shop for battery boxes, PCB boards ,brass legs etc... Can you post the link ...Thanks ! Hey i saw the the video Wests Rebuilds and happy to see you with Will Profuse from mobilesolarpower.com . you and him are really helping the solar community get started ! I don't know how well you know him but he seems to be an expert from experience ...really smart and no b.s. thanks and take care !
Have seen your videos and enjoy them. Need some help hoping you can solve my dilemma. I purchased a volt bike about 2 years ago which is no longer sold. Since then the 48VDC battery pack will not take a charge. It is to my credit they do not charge as they were left for about a year without charging. The system consists of a power brick (115VAC-Input to 48VDC-output) which plugs into the battery pack on the output side of the battery pack are some terminals for output. I have been informed for this situation I could connect an ordinary 12VDC battery charger to the output of the battery pack and allow it to slow charge. Is there any truth to this theory?
It's a long time I'm waiting to start a project because I want this ElectroDacus SBMS120 wich I think will be the best fit to stay as simple as possible. I am not yet sure if I go 7S on LiCoO2 or 8s on LiFePO4 But I have more than max solar panels already. I'm in now. This will power my office except inverter for a/c and heating (as a begining) all the machines computers and lighting fit the envelope.
Thanks for supporting the Solar BMS project. I recommend using LiFePO4 as those will be more cost effective over the life time in off grid type applications. LiCoO2 make sense if you are interested in a portable system as they have higher energy density but they will have higher cost amortization due to lower cycle life.
Thanks, yes, that was in my mind, but as I may find a lot of used 18650 by my job, I might go for this opportunity instead. Currency is becoming rare this days ... and I have plenty of time.
quick question - What size mppt charge controler should i use for a 500W - 4 solar panel 30V total so max 20 AMP? should i use a 20 AMP one like the cheap kinds on ebay for about 20$ or else? Thanks
It is cool that Rich put that out there for everyone to see. It looks like the only real way to have a catastrophic failure is to overcharge them. And I was thinking the same ;^)
According to the Batrium BMS 7s Battery cell wiring diagram, the 7 leads are tied to 7 lithium cells (or parallel cell groups) in series for a 24V system. But, your PCB 7s cell boards are 7 cells in series. And when you connect multiple PCBs together, you're paralleling them as 7sXp systems. So how would you connect this or any BMS to balance each cell in each PCB module? Does each PCB BMS connector operate in parallel with all other PCB BMS connectors? And do you provide BMS connector assemblies or instructions on how to make them up?
Quick question: Would it be better to have smaller packs each with a protection board wired in parallel or one large pack? My thought is that I could add packs later on to add to the total capacity.
I have a Canon T7i and I want to build an external power pack with 4 18650 batteries. I have the Canon AC adapter and rather than using the power brick I want to connect a 2S system with 4 batteries. Just not sure what I need. I can easily charge the batteries in a charger so it doesn't need to charge. I need to output 8vdc.
Hi Jehu! And thanks for this video! Maybe finally a bms for my Rv’s diy 3s battery..! Sorry for my English But I did not understand if it can handle 3s 12,6v..can it? Best thanks
@@electrodacus Ill go for the 40A So, my 2x100w solar pannel system will work if understand. In an other way ..can we imagine to use it too, with an other dc input like the engine alternator 14v..? My 3s battery is a 12.6 v max
Yes your 2x 100W will work with a 3s and SBMS40. Since your battery is 240Ah you can maybe add more panels in the future up to 6x 100W with SBMS40. Is not economical at all to use the alternator as a source of charging the battery as it is very expensive. Pv panels have a cost amortization as low as 2 cent/kWh over their lifetime but each kWh you get out of your alternator will cost you at least 1 liter of fuel that will be at least around $1/kWh. So if you drive your vehicle will use about 1 liter more of fuel for each kWh you get out of the alternators it is the same idea as using the air conditioning increases the fuel consumption as it is adding more load to the motor. Even if you do not care about the cost you will need something like a battery to battery charger as that will know when engine is off not to charge your lithium battery and drain the small starter battery and also limit the current else alternator will push as much as possible and get damaged from overheating as it was designed for charging just a small Lead Acid starter battery.
I guess I could add a relay from the load + from the advanced bms to allow for a direct connection to the batteries to run inverters as it says not to run inverters from the bms. Would this be safe and allow the undervoltage protection?
Inverters are all designed to be directly connected to battery and many have a remote ON/OFF connection that is typically just a parallel connection to the mechanical ON/OFF switch that only switches 10 to 20mA at around battery voltage to power on the inverter. That remote ON/OFF will connect to a BMS for undervoltage protection in case of SBMS0 that connection is called EXT IO3 and set as type 2 meaning open circuit thus turning inverter OFF when any cell is below set voltage.
How many boards can you put on one Dacus BMS? Is it one board with 7 cells per Dacus BMS? Just asking because I am building a powerwall that will require many boards.
Any number of parallel cells will be no different from a single large capacity cell so if your system will be 24V so 7s with those sort of cells then just one SBMS will be needed likely you will want the new low cost SBMS0
I want it to start balancing when it starts charging. They was a guy who had a lipo fire at 4.7v!!! I only want to charge to 4.0-4.1v and discharge to 3.0-3.2v
Yes SBMS will start to balance when two conditions are meat. One is a minimum charge current about 400mA for SBMS40 around 1A for SBMS120 and SBMS0 will depend on external current shunt ans settings and the second condition will be a delta of at least 10mV between cells. This way cell balancing can be done for up to a few hours each day allowing a small cell balancing current to keep in balance even very large battery packs 20kW to 100kWh are not problem for SBMS. The above are just default settings user can chose to have cell balancing at any delta between cells and even do cell balancing during discharge (not that will be very useful in many setups).
Jehu, do you know anything about Orbisdriven.com or ORBIS Wheels in Mill Valley, CA. They have developed a highly efficient ring drive technology which they put on a Honda giving it 4 wheel electric drive. I’m thinking it would be ideal for a VW bus, getting rid of the transmission entirely. And it’s super efficient, better than a Prius. Thanks, Clyde.
I understand these are really cool charge controllers, but I don't understand why he did not make one that was MPPT? One would get about 15% to 20% more out of the solar panels. There are some very nice BMS with bluetooth capability to monitor including many verynice charge controllers that this would compete against. These SBMS charge controllers were pretty much obsolete when they first came out simply because they had no MPPT capability. They are unique with the screen and processor but also a step backward in charging capability. If one is concerned about a BMS handling a large amp load one can easily have a BMS control a 300 to 500 amp relay. The only reason I can think of for him not including the hardware to make this an MPPT is because these PWM controllers are somewhat simple in number of parts and did not cost much to make. A fancy PWM charge controller is not any more efficient than any other cheap PWM controller but still cost as much as a good quality MPPT controller and separate BMS, I just don't see the advantage.
I would like to ask. Normally 18650 is max at 4.2 volts.and now i got bms for 26s config. Now how can i under volt them charging them at 4volts. Should i supply 102v and bms will balance them at 4v each cell or some cell will be 4.2 and some cell are lower
Tu ingles es perfecto, podrias hablar mas despacio y que el traductor le diera tiempo a traducir?? No te pillo ni una y es interesante lo que dices. Gracias.
While it is not elegant and normally do not recommend two SBMS0 can be used in series for a 48V system. But a single 7s 24V with up to 500A will allow for 12kW max size inverter and not sure how many will need more than 12kW.
Lithium ion battery of 351 volts of 95 cells came with its BMS but I'm converting it from 351 volt to 48 volts for my inverter. Can the stock BMS still work with it if stepped down to 48 volts configuration?
If it doesn't have a transformer or any kind of inductive element, it is a battery MONITORING system. Passive balancing via discharge is essentially useless at balancing cell voltages. A battery MONITORING system is still useful because it prevents damage to individual cells.
The passive cell balancing system used in the SBMS is the most advanced possible and can keep in balance a battery as high as 100kWh in capacity. Same type of cell balancing is used on all commercially available EV's including Tesla and their huge packs are perfectly balanced.
@@electrodacus There's really no point in keeping a pack in balance using a passive balancing system while the battery pack is in use since you'll get the exact same capacity out of the pack (assuming you are still using a monitoring system) regardless of whether the balancing algorithm runs (unless the cells are BADLY out of balance). A passive balancing architecture just burns off useful energy as heat. Unless you use an active balancing architecture, you really only need a battery monitoring system and manually top/bottom balance a pack every one or two hundred cycles or when the monitoring system reports that two different cell-layers are bottle-necking charge and discharge. A passive balancing system that can keep large packs in balance by voltage is wasting money on superfluous power MOSFETs and the associated thermal management. To get the most out of a battery pack without an active balancing architecture, top balance the pack and stop discharging when one cell-layer hits 3V (or 2.8V for LiFePO4). If manually balancing the pack at any point in its lifetime is not an option, that's when a passive balancing system that only runs during charging would be needed (in which case, the unit manually top balances the pack every charge cycle, but it has all the time in the world to top balance, so it wouldn't need excessively large power MOSFETs and thermal management). Honestly, the resources required for a sophisticated passive system could be used to make a sufficient active system, just add a flyback transformer and isolated mosfet drivers.
I had a 100Ah 8s GBS LiFePO4 battery and used that for 4 months with the SBMS but cell balancing disabled. Battery started perfectly top balanced and after 4 months of normal offgrid usage about 50% of battery capacity used every day the cells where 2Ah out of balance meaning than when the highest cells was fully charged the lowest cell needed additional 2Ah to get fully charged. So basically 2% of battery capacity was lost over 4 months of normal use or around 0.5% per month. Now if the cell balancing will have been enabled on SBMS then charging will have been done just during the day when charge current was above 1A that is most of the day as more than that will typically get in to battery while charging. Now the cell balancing is around 150mA so that means all all energy for cell balancing comes from PV panels directly and not from battery so cells that are higher and need balancing will see a charge current that is 150mA smaller than the other cells so no energy is extracted from any battery. Say charge current is 10A then some cells will see full 10A and the higher cells will see 9.85A. Based on the GBS example the cells will only need about 3 to 4h of cell balancing over a full month to be maintained fully balanced. All that energy "wasted" for cell balancing that will not be much is directly from PV panels so say the 0.5Ah per month for the 100Ah battery means say 24V x 0.5Ah = 12Wh /month that will be 144Wh over a year and say over 10 years that will be 1.44kWh and at a just 2 cent/kWh cost amortization for PV panels that will be around 3 cent total over 10 years period (actually nothing as there will be plenty of excess energy from PV in an offgrid application). While this 2.5kWh is a small battery even a 2.5kWh will only cost 30 cent in wasted energy over 10 years period and you will not want to manually balance your pack energy few months for less than $1 in 10 years :) You will also need that energy when you do the manual cell balancing so not even a few cents of savings. Same will be the case for anything other than restive cell balancing (it is just not economical).
How does one unit manage to balance more than 7 batteries? Seems like you would have to invest 300$ per 7pack of batteries... which would get very expensive very fast... Is there a way of multiplexing the different clusters of batteries? Like with relays or somthing like that, you could balance one pack at a time autonomously...
Glad you gave ElectroDacus a shout out. Creator is a great guy. He has a new product that is BMS only for less cost.
Do you have a link
Thanks Jehu for the video. When powered over USB you can just play with the menu for the Parameter settings to be saved it will need to be connected to a battery as the main IC the ISL94203 is not powered when on USB power and all those parameter settings are saved directly inside the ISL94203 EEPROM and then it will need a power cycle as at power up ISL94203 will load the EEPROM content in to a working RAM memory.
I think for most the new low cost SBMS0 is the best solution as it is just around $120 and it has all the future's of this other chargers including the BMS with cell balancing and LCD with all the energy logging futures (will internally log last year of data and it can be downloaded over serial) but is just missing the PV charger functionality that can easily and inexpensively be done with an external DC SSR controlled by SBMS0 or if you want one of the Victron MPPT Smart solar as they have a remote ON/OFF port that will integrate with SBMS0
Any inverter up to 12KW can be used with SBMS0 as SBMS0 will be used with up to a 500A 75mV external current shunt. The inverter will need to support remote ON/OFF (most do) like Victron, Cotek and I use the low cost PIP2424 all this and other support remote ON/OFF or can be made to but not all (you can ask me if not sure).
All my projects are open source so if you have the knowledge you can build an SBMS yourself but if you only need one or two then it will be much more cost effective to get one from me.
i will like to get this for my 18650 14s 80p power wall, i am running my home whit this. so i will need to run 2 of this BMS on series? oh i am building 14 more packs so i can be on the 20k range what you can recommend ? by the way thank you for your work and jehu for be a O.C.D. Freak! On Building DiY Stuff lol
While it is possible to use two SBMS0 for a 14s 48V setup is not that elegant as there will be two SBMS0 each with is own LCD and is own current shunt both showing almost the same thing. Assuming those are 2Ah cells you will have a 160Ah 51.8V = 8.22kWh pack and that is not particularly large. Even a 20kWh pack can be on 24V as typical charge rate should be around 0.2C for long battery life and discharge is typically less than 0.5C. Since SBMS supports an external up to 500A current shunt that means loads of up to 12kW can be connected.
One of the larger systems made with SBMS that I know of is an offgrid setup with a 8s3p LiFePO4 25.6V 900Ah = 23kWh and it has 3x 3000W Victron inverters in parallel for 9000W AC
Hi Dacian :)
I have the SBMS 100. Great product, great support. Really smart developer. And this product is built to last. If I remember correctly I think the design was created with a 25 year life expectancy on the hardware. Pretty impressive. Keep up the good work. Thanks.
Thanks for the comment Anthony.
Hello, I think this might be the perfect product for our home. Been looking for a BMS / charge controller with adjustable battery charge voltage cut off. QUick question: if I have a 18650 Battery and I want a 12 v system and limit the charge to 4v for battery longevity, would you recommend running at 3s or 4s set up with this device? Many thanks and wonderful product!
I have the sbms 40. I have had it setup for about 1.5 years. It is a wonderful product.
I have a sbms 120. It is a quality product. Much more advanced than any other bms I've used.
Timing is amazing. Just yesterday watched a build of a DIY solar generator using this solar controller and BMS. I am planning my build and was bummed this won't be available until 5+ months from now.
I just went on his kickstarter and pledged for the SBMS0, exactly what I needed. I actually will be using a Victron charge controller, wanted that for the Bluetooth.
Mad props, content like this is gold.
Good luck
Subbed
Can you collaborate with SBMS's team to custom design that spesifically fit to battery PCB system? That would be ultra-cool.
I’m sure you have plenty on your plate, but have you reached out to the creator perhaps at some point you could license the software and design from the creator so others can purchase what that needed to build their own. Maybe even release a board in your own form factor that can utilize the ElectroDacus software. Not for free of course but something mutually beneficial. Either way get some control of release and production for use with your solution; it’s seems perfect.
I know I am kind of randomly asking but do anybody know of a good place to stream newly released series online ?
Finally I've been wanting you to talk about the electrodacus!
Glad you got to get a review out on this amazing product with loads potential! I hope this helps get him to his Kickstarter goal so he can start mass production!
you have not done this bms any justice you should do a full vid and a build just to show what this can do it should be mass produced in china so that thousands can be made and all can get there hands on one. of course ElectroDacus should be fully compensated for all his hard work and years of time he has put into this project very cool product very big like.
Jehu Garcia, you're a saint. Honestly. You are working hard to give something that does not come easily to many. Watch out for lizard people. They like round Earth money.
Dacian... I have been following that guy. Really gentleman.
Will this work with 2 Tesla batteries, either in series or parallel? How many would I need for the 2 batteries and what size? Thanks for the great video and information.
Hey Jehu >> I'm way behind but I won't lose track of you again..... A Power Wall is
something EVERYbody needs whether they know it or not..... lol, I desperately need
all the help I can get on this journey. I want to CUT the Electric Company out of the
equation. Batteries have been the problem & I thank you for the heads up on all the
components too. I'm getting ready to set-up a Hydroponic Garden whereas I've got
fish growing & the waste feeds the plants as they filter the water for the next cycle.
OFF the Grid is the only way to go..... I'm with you, so glad you're doing this and I
need help sizing & other stuff...... thanks man
For many / most people generating your own power can be more expensive than the Grid. You will need a huge power wall to run an ALL ELECTRIC home - especially in the winter time when there is no sun for many consecutive days and it is below zero outside. The average home consumes 30 kilowatt-hours per DAY !!!
I watched ur videos I like it and I need 700-800 w portable solar generator for cooking and other household purposes while camping can u suggest what type,brand and size of solar panel and solar generator to buy and the solar panel should fit in my sedan car. And I'm in india
Great video. The sbms and mppt450 will be on my next house
William I bought 32 cells of Yinlong Lithium 66160h 2.3v Titanate & the BMS I got their processing still was DYKB 7S - 20S Smart Bluetooth 80A , 100A , 320A , 300A , 400A lithium Ali-ion Lipo LifePo4 Battery BMS protection board 48v , 36v , 24v , 16S I ordered 2 “ I could not find what you had recommended on Ali Express ! Was this a good choice ? I lost the link to buy them through you , although I did message the sellers I was vying because of you DIY Willian
You need to avoid the cheap,cheap battery mismanagement systems! I been looking in to Dacians BMS. Just didn't know how to get it... Lost touch with him he has some really good ideas and systems..
Does this negate the need for a solar charger? When buying a bms what is the "amp rating" relating too? the charging max amps the battery is outputting or the max amps the bus can handle from the solar system? Thank you for you videos and you time if you answer this question!
I was trying to decide on whether or not to use a commercial BMS. I assume any BMS will have a current drain on each cell to achieve balancing. My voltage regulator limits charging voltage to 14.5v. On a 12v 4 cell LIFEPO4 battery, I think I can get by with 4 x 330 OHM resistors as a voltage divider between cells, which will have a 10ma drain and passively balance each cell to the same voltage.
what is the current status of these BMS units? The URL has no info on buying, just people complaining that they didn't receive the orders. I would love to use one of these for my S20 72v pack, I'm ready to buy but no idea the state of where we are with this unit.
Jehu you should do a vlog on adding this bms to your vw van so it’s battery doesn’t die in only a couple years it will last 10 years with 90% range capacity
My bus is 111v nominal, how do you suggest I use a 24v bms system?
111V is 30S. Is there a bms available to balance a 30S battery?
@@christothegreat1 Yes there is a 30S BMS, but the AMPS !!!
MrSummitville
For high amp protection, you connect each cell with a solid bare wire than will melt when more than X (5 or 10?) amps tries to pass thru it at any given instant.
@@christothegreat1 Yes, I know about individual cell protection, I am talking about the total amps for the 100 kw electric motor !
Thanks! Something like this is an overkill if you already have a solar inverter with MPPT controller included or it goes well with it as a middle point BMS for the pack?
Did this thing die? It doesn't look like its still viable on the links provided. Seems like a really fantastic idea.. combining BMS and balancing with charging is ideal..
Jehu, when are you gonna, do a hook up a test which the SBMS? Really enjoying your videos also learning a lot from and other RUclipsrs although am late on some of your videos due to work I may be the only person in Jamaica that is trying to do something different started gathering cell even tho it's hard to do so look to buy from you guys at some point starting small for my first project hopefully will be a portable power pack just to like charger my phone and run maybe an led light it the case of an outage for the day. Thanks for the great content.
But hey have you seen the new SBMS0?! It seems like a really smart update to make it more widely applicable.
Good video & could you please provide some free E books to learn more basics about it.
hi garcia, ive watch a few of your vids and u seem like a very knowledgeable person using these batteries, but i have to add something that ive noticed has never actually been mentioned, now we all know that 18650 cells are different in chemistry and milli-amps, (1) if u over charge a 18650 battery it releases the top vent(built under the cap) and shuns off the over charge pressure which can result in the battery going bad(never seen you guys mention that) (2) when packing multiple 18650 cells, lets say 80 in 1 pack thats 4/20, we do not have all cells at the same charge capacity(even if the cells are new from factory, so when they charge as soon as 1 reaches full the power is vented off to the other battery that's not full, ive tested this theory of the repackr method against just randomly putting known good cells in a pack and they both charge excellent, what i do notice is u guys say u want each cell being as close in milli amps as possible which is a very wise choice in my opinion but i myself have done tests where a cell varies off buy 1amp and it does work flawless when charging using my solar panels, so the repackr to me is not a must, but its a good thing still, (3) ive seen you show the concept of buss bars and ive never seen anyone explain why using certain thickness in bus bars can lead to under charging or low power output,wires are rated in ohms to carry a certain amount of power, and when using 12v, 24v, 48v etc etc the wires are rated differently. i could go on about a few stuff but i'll leave that for some other time, cheers
Dacian has the SBMS0 which is a unit like the 120 and 40 only without the ability to take the power from your PV panels and put it into the battery. What he has now is the DSSR20 which is basically a charge controller for 2 PV panels that you run to your battery bank. That means every two panels are independent. If you have 12 panels and one gets shaded only that pair will stop making power the other 10 panels will continue to send power to the battery bank. The closest thing I can compare it to is a mini inverter but for your battery bank. The other thing is they are for lithium batteries so they charge to the set point and stop charging as lithium batteries only want constant current and then nothing. This system will extend the life of your battery big time. If you are using a system that give the three levels of charge like float etc then you are hurting your lithium batteries and most people do not even know it. Stop using any other charger system for your lifepo4 batteries because you are shortening their life. This is for a 24v off grid system and it works perfectly. you will save so much money and kick yourself for not doing this sooner.
Hey there Jehu. I was wondering. Can you use for instance a 4S 5P BMS (18650) in a 3P configuration? Then add the other 2P later? Like a day or so? Or does the whole BMS need to be populated for it to work??? My goal is a 4S 14.8v board that hopefully I can expand later to increase the amperage/storage.Thank you!
I'm confused...If you go to the kickstarter page and look at the comments you will see someone asked if this BMS will work well with reclaimed 18650's. ElectroDacus responded that nothing works well with reclaimed 18650's and that when new, their expected cycle life is only 500 cycles. He stated that this would protect them from over charge and overdischarge but not be able to balance very well. The exact quote was "In any case SBMS (any models) will work with any type of Lithium cells is just that I do not recommend wasting time with reclaimed 18650."
I find it odd that this wasn't mentioned in the video.
I also recommend using new cells with my PCB kits, where is the confusion?
😎😎😎👍👍👍 thanks for this new video sharing your knowledge.
BMS placement with the hoodie draw strings kinda reminds me of the flava Flav clock necklace only with BMS. 😜
10,000! You da man... Jehu bird-dogging another special! Thanks for your hard work.
I almost always charge to max 80% for li-ion and discharge to no less then 40%. Gives good run time for most applications and maximizes battery life.
Also, only gives you 40% of stated Battery Capacity ... And my car would last a lot longer, if I only drove 1 mile per day !
i ordered that lithium book ,cant wait to put my nose in it ,I like this setup
if you have a SMART BMS in your ebike battery pack... Do you need a separate BMS if the ebike battery is charged by a GVB-8 LI-MPPT-boost/charge controller connected to the Solar panel.
Thanks for your informative videos. All we need is for you to get to the point where you develope and market a Plug & Play Solar System for the average Joe, upscalable of course. Wreaking terror on the utility companies that hold their monopolies in many states. We are not there yet, but we are slowly, but steadily marching in that direction. We are still stuck in "research and developement" stages. The next Elon Musk will have Plug and Play available for say lighting systems and perhaps whole house power generation. Let's pool our knowledge, so we can speed up the plug and play reality, we have less than a 100 years each, to make our "mark/difference".
Hello
thank you for your quite informative channel
I would like some information, I cannot understand how to choose my BMS
as an example I made a 12v 3S4P battery with 12 18650 batteries (recovery from 2.5ah to 1.8ah) to operate a 20w led ... I understand for the 3S but how to determine the current (A) of the BMS? knowing that the led consumes about 1.6ah ...
thank you so much
Hello Jehu,
I’m planning to build an off-grid solar system with +/- 4KW battery (24V).
You offer a number of components which I’m looking for.
A few questions:
Do you ship from your shop to Belgium?
Can I use a grid tie converter for an off-grid system?
Thanks for your reply.
Thanks so much for the video! I was wondering about the following: if I want to connect 12 3.2V 100ah cells to produce a 12V 300ah battery, how would I ideally connect a BMS? Will I connect a BMS for each of the 12V 100ah batteries and then another one for the battery as a whole? Or just for each of the 12V 100ah batteries? Or just for the battery as a whole? Thanks so much!
If each BMS does only 100 Amps then you would design three different 4S1P batteries and then connect those three batteries in parallel using 3 @ 100 AMP FUSES ...
Does it have low-temperature cut-off ? Do you have a 12V BMS with 300 amps ?
Hello sir, as a newcomer to the building of lithium ion batteries I have stumbled across a problem you may be able help with please if not too much trouble, I have built a 3s 8p battery and went down the path of installing PREBUILT BMS`s onto them, my BMS was attached to the end of the battery and connected to the cells as I was advised, on completing them and having a I noticed on each BMS some of the components were getting ridiculously hot to the point they were untouchable, is it possible I have wired the BMS up wrongly and would you consider them now to be burnt out and useless? many thanks and eagerly awaiting your reply,
@electrodacus, I’m new to this but have been reading for a few months. I have access to a few large (ones that go on the roof of the house, maybe 200-300W) PV solar panels and want to hook them up in my back yard to run some hydroponics pumps and to charge some power tool batteries (120V AC). I will probably add more panels later as well. I’m not sure what kind of batteries I will use, but I’m leaning towards building them with 18650’s and Jehu’s PCB kit. I like the idea of have an all in one integrated unit without having to buy any separate inverters or anything else. Does it sound like the SBMS120 is the right unit for me to buy? I’m hoping you can reply soon so I can join the Kickstarter. Thanks!
Did these BMS systems become available? Just seeing this video for the first time
What is the right BMS for 4s 10p battery pack ......cells are 18650 3200mah .....what is the current rating of bms ??
Hey Jehu I love all your videos and the information you share.. when will your kits become available again? I have emailed you but have yet to get a response. I want to build my own and your kit would make it so much easier to get going.
Hi how u doing i see u commercial the module ess Samsung
This module come with bms everything complete only think you have to plug to inverter
I watch your videos for a short time and i love it .... you do a great job.... i love your system for the battery packs ... 🤗🤗🤗😎😎 very very good...
The vruzend system is also great but yours is a bit more prof.
Very good 🤙🤙☝️
Greets grom Austria in Europe
Hey, I am having problem with LiFePo4 battery pack 10A BMS. It cut off due to my 300w inverter capacitor charging even when its drawing 15w only. I am thinking of using BMS for charging and another way for 20A discharging.
What battery protect system should I use, Victron BP-65 is not easily available & is expensive in India.
Have any suggestions on solar/wind combos ? Are they suggested?
Hi Jehu ,I'm interested in your dig power wall but I can't find the right link that will bring me to shop for battery boxes, PCB boards ,brass legs etc... Can you post the link ...Thanks !
Hey i saw the the video Wests Rebuilds and happy to see you with Will Profuse from mobilesolarpower.com . you and him are really helping the solar community get started ! I don't know how well you know him but he seems to be an expert from experience ...really smart and no b.s. thanks and take care !
kit.com/jehu/jehu-s-diy-powerwall-pcb-project
Have seen your videos and enjoy them. Need some help hoping you can solve my dilemma. I purchased a volt bike about 2 years ago which is no longer sold.
Since then the 48VDC battery pack will not take a charge. It is to my credit they do not charge as they were left for about a year without charging.
The system consists of a power brick (115VAC-Input to 48VDC-output) which plugs into the battery pack on the output side of the battery pack are some terminals for output.
I have been informed for this situation I could connect an ordinary 12VDC battery charger to the output of the battery pack and allow it to slow charge. Is there any truth to this theory?
It's a long time I'm waiting to start a project because I want this ElectroDacus SBMS120 wich I think will be the best fit to stay as simple as possible. I am not yet sure if I go 7S on LiCoO2 or 8s on LiFePO4 But I have more than max solar panels already. I'm in now. This will power my office except inverter for a/c and heating (as a begining) all the machines computers and lighting fit the envelope.
Thanks for supporting the Solar BMS project. I recommend using LiFePO4 as those will be more cost effective over the life time in off grid type applications. LiCoO2 make sense if you are interested in a portable system as they have higher energy density but they will have higher cost amortization due to lower cycle life.
Thanks, yes, that was in my mind, but as I may find a lot of used 18650 by my job, I might go for this opportunity instead. Currency is becoming rare this days ... and I have plenty of time.
quick question - What size mppt charge controler should i use for a 500W - 4 solar panel 30V total so max 20 AMP? should i use a 20 AMP one like the cheap kinds on ebay for about 20$ or else?
Thanks
Any suggestions for lifepo4 sources for great prices? Looking for 18650s and larger storage. Thanks!
Will it do 48v sistoms???
Maybe you can have a word with Rich about BMS's..
It is cool that Rich put that out there for everyone to see. It looks like the only real way to have a catastrophic failure is to overcharge them. And I was thinking the same ;^)
wich more good for price per capacity between lithium battery and car battery for solar system power?
How does it handle high Amp loads like a 12 volt 4000 watt inverter/charger I'm going to be using 320 ah life4o cells
According to the Batrium BMS 7s Battery cell wiring diagram, the 7 leads are tied to 7 lithium cells (or parallel cell groups) in series for a 24V system. But, your PCB 7s cell boards are 7 cells in series. And when you connect multiple PCBs together, you're paralleling them as 7sXp systems. So how would you connect this or any BMS to balance each cell in each PCB module? Does each PCB BMS connector operate in parallel with all other PCB BMS connectors? And do you provide BMS connector assemblies or instructions on how to make them up?
The ribbon cable ( balance leads ) connects all of the cells, on one battery board in parallel with all of the cells on the adjacent battery board...
Awesome video. Like the product not the delay on shipment.
Did you finish the SAMBA?
My lead acid can’t hold a charge above 20%. Even 20% is not stable. Does that mean my battery have reached its end period
How old is the batterry? How many CYCLES? Flooded, or AGM?
7:38 You meant to say will NOT last longer. Just to avoid confusion for others.
Quick question: Would it be better to have smaller packs each with a protection board wired in parallel or one large pack? My thought is that I could add packs later on to add to the total capacity.
Both
Do they make these for 12v systems?
Jehu, do you see solar panel kits?
that's my boi. Dishing out that good info.
I've run a sbms40 for a year now I believe you commented on a video I made I mad a new video with a small 72ah 24v bank
I have a Canon T7i and I want to build an external power pack with 4 18650 batteries. I have the Canon AC adapter and rather than using the power brick I want to connect a 2S system with 4 batteries. Just not sure what I need. I can easily charge the batteries in a charger so it doesn't need to charge. I need to output 8vdc.
Where can i buy 5he plastic battery holders.to.make battery.pack builds.easier.
What system does Tesla use for a 400 V battery pack?
what bms are you using on your power wall
Hi jehu I own a litle farm is it posible to put a reliable midium farm tractor with the most powerfull panels
Hi Jehu! And thanks for this video! Maybe finally a bms for my Rv’s diy 3s battery..!
Sorry for my English
But I did not understand if it can handle 3s 12,6v..can it?
Best thanks
Yes it can handle 3s that is the minimum configuration but anything between 3s and 8s is possible.
electrodacus , thanks I’ll go for a 120A, my rv diy is a 240amph
👍🏻👍🏻
You also need to now that PV panels need to match the battery voltage so just 32 or 36 cell panels will work efficient with 3s or 4s
@@electrodacus
Ill go for the 40A
So, my 2x100w solar pannel system will work if understand.
In an other way ..can we imagine to use it too, with an other dc input like the engine alternator 14v..? My 3s battery is a 12.6 v max
Yes your 2x 100W will work with a 3s and SBMS40. Since your battery is 240Ah you can maybe add more panels in the future up to 6x 100W with SBMS40.
Is not economical at all to use the alternator as a source of charging the battery as it is very expensive. Pv panels have a cost amortization as low as 2 cent/kWh over their lifetime but each kWh you get out of your alternator will cost you at least 1 liter of fuel that will be at least around $1/kWh. So if you drive your vehicle will use about 1 liter more of fuel for each kWh you get out of the alternators it is the same idea as using the air conditioning increases the fuel consumption as it is adding more load to the motor.
Even if you do not care about the cost you will need something like a battery to battery charger as that will know when engine is off not to charge your lithium battery and drain the small starter battery and also limit the current else alternator will push as much as possible and get damaged from overheating as it was designed for charging just a small Lead Acid starter battery.
@jehugarcia would love to see it hooked up with a load and see it work with the pcb system
hi,
i'm wondering if i can use a 10s BMS as a 8s ?
@jehugarcia can i use this for a DIY mini EV solution
I guess I could add a relay from the load + from the advanced bms to allow for a direct connection to the batteries to run inverters as it says not to run inverters from the bms. Would this be safe and allow the undervoltage protection?
Inverters are all designed to be directly connected to battery and many have a remote ON/OFF connection that is typically just a parallel connection to the mechanical ON/OFF switch that only switches 10 to 20mA at around battery voltage to power on the inverter. That remote ON/OFF will connect to a BMS for undervoltage protection in case of SBMS0 that connection is called EXT IO3 and set as type 2 meaning open circuit thus turning inverter OFF when any cell is below set voltage.
How about hooking that think up, show us how it works!!!! And what it do!
How many boards can you put on one Dacus BMS? Is it one board with 7 cells per Dacus BMS? Just asking because I am building a powerwall that will require many boards.
Any number of parallel cells will be no different from a single large capacity cell so if your system will be 24V so 7s with those sort of cells then just one SBMS will be needed likely you will want the new low cost SBMS0
@@electrodacus Thank You very much for your response AND advice. Looking forward to the future of your product.
I want it to start balancing when it starts charging. They was a guy who had a lipo fire at 4.7v!!! I only want to charge to 4.0-4.1v and discharge to 3.0-3.2v
Yes SBMS will start to balance when two conditions are meat. One is a minimum charge current about 400mA for SBMS40 around 1A for SBMS120 and SBMS0 will depend on external current shunt ans settings and the second condition will be a delta of at least 10mV between cells. This way cell balancing can be done for up to a few hours each day allowing a small cell balancing current to keep in balance even very large battery packs 20kW to 100kWh are not problem for SBMS. The above are just default settings user can chose to have cell balancing at any delta between cells and even do cell balancing during discharge (not that will be very useful in many setups).
Jehu, do you know anything about Orbisdriven.com or ORBIS Wheels in Mill Valley, CA. They have developed a highly efficient ring drive technology which they put on a Honda giving it 4 wheel electric drive. I’m thinking it would be ideal for a VW bus, getting rid of the transmission entirely. And it’s super efficient, better than a Prius.
Thanks, Clyde.
I understand these are really cool charge controllers, but I don't understand why he did not make one that was MPPT? One would get about 15% to 20% more out of the solar panels. There are some very nice BMS with bluetooth capability to monitor including many verynice charge controllers that this would compete against. These SBMS charge controllers were pretty much obsolete when they first came out simply because they had no MPPT capability. They are unique with the screen and processor but also a step backward in charging capability. If one is concerned about a BMS handling a large amp load one can easily have a BMS control a 300 to 500 amp relay. The only reason I can think of for him not including the hardware to make this an MPPT is because these PWM controllers are somewhat simple in number of parts and did not cost much to make. A fancy PWM charge controller is not any more efficient than any other cheap PWM controller but still cost as much as a good quality MPPT controller and separate BMS, I just don't see the advantage.
When soldering a recycled cell... Does it have to be discharge?
No ...
I would like to ask. Normally 18650 is max at 4.2 volts.and now i got bms for 26s config. Now how can i under volt them charging them at 4volts. Should i supply 102v and bms will balance them at 4v each cell or some cell will be 4.2 and some cell are lower
No bms usually only balance once any cell hits 4.3v
@@jehugarcia have you tried smart BMS before.? do undervolting or can i set 4 volts on max voltage settings. ?
Tu ingles es perfecto, podrias hablar mas despacio y que el traductor le diera tiempo a traducir??
No te pillo ni una y es interesante lo que dices.
Gracias.
any chance for the 14s 48v people systems? for this BMS
While it is not elegant and normally do not recommend two SBMS0 can be used in series for a 48V system. But a single 7s 24V with up to 500A will allow for 12kW max size inverter and not sure how many will need more than 12kW.
Lithium ion battery of 351 volts of 95 cells came with its BMS but I'm converting it from 351 volt to 48 volts for my inverter. Can the stock BMS still work with it if stepped down to 48 volts configuration?
Not likely
Hey jehu can we connect passive and active BMS togather on one battery. Like i want to connect active equaliser and bms. Pls reply
Usually no, but it all depends upon how each one functions ...
If it doesn't have a transformer or any kind of inductive element, it is a battery MONITORING system. Passive balancing via discharge is essentially useless at balancing cell voltages. A battery MONITORING system is still useful because it prevents damage to individual cells.
The passive cell balancing system used in the SBMS is the most advanced possible and can keep in balance a battery as high as 100kWh in capacity. Same type of cell balancing is used on all commercially available EV's including Tesla and their huge packs are perfectly balanced.
@@electrodacus There's really no point in keeping a pack in balance using a passive balancing system while the battery pack is in use since you'll get the exact same capacity out of the pack (assuming you are still using a monitoring system) regardless of whether the balancing algorithm runs (unless the cells are BADLY out of balance). A passive balancing architecture just burns off useful energy as heat. Unless you use an active balancing architecture, you really only need a battery monitoring system and manually top/bottom balance a pack every one or two hundred cycles or when the monitoring system reports that two different cell-layers are bottle-necking charge and discharge. A passive balancing system that can keep large packs in balance by voltage is wasting money on superfluous power MOSFETs and the associated thermal management. To get the most out of a battery pack without an active balancing architecture, top balance the pack and stop discharging when one cell-layer hits 3V (or 2.8V for LiFePO4). If manually balancing the pack at any point in its lifetime is not an option, that's when a passive balancing system that only runs during charging would be needed (in which case, the unit manually top balances the pack every charge cycle, but it has all the time in the world to top balance, so it wouldn't need excessively large power MOSFETs and thermal management). Honestly, the resources required for a sophisticated passive system could be used to make a sufficient active system, just add a flyback transformer and isolated mosfet drivers.
I had a 100Ah 8s GBS LiFePO4 battery and used that for 4 months with the SBMS but cell balancing disabled. Battery started perfectly top balanced and after 4 months of normal offgrid usage about 50% of battery capacity used every day the cells where 2Ah out of balance meaning than when the highest cells was fully charged the lowest cell needed additional 2Ah to get fully charged. So basically 2% of battery capacity was lost over 4 months of normal use or around 0.5% per month.
Now if the cell balancing will have been enabled on SBMS then charging will have been done just during the day when charge current was above 1A that is most of the day as more than that will typically get in to battery while charging. Now the cell balancing is around 150mA so that means all all energy for cell balancing comes from PV panels directly and not from battery so cells that are higher and need balancing will see a charge current that is 150mA smaller than the other cells so no energy is extracted from any battery.
Say charge current is 10A then some cells will see full 10A and the higher cells will see 9.85A.
Based on the GBS example the cells will only need about 3 to 4h of cell balancing over a full month to be maintained fully balanced.
All that energy "wasted" for cell balancing that will not be much is directly from PV panels so say the 0.5Ah per month for the 100Ah battery means say 24V x 0.5Ah = 12Wh /month that will be 144Wh over a year and say over 10 years that will be 1.44kWh and at a just 2 cent/kWh cost amortization for PV panels that will be around 3 cent total over 10 years period (actually nothing as there will be plenty of excess energy from PV in an offgrid application).
While this 2.5kWh is a small battery even a 2.5kWh will only cost 30 cent in wasted energy over 10 years period and you will not want to manually balance your pack energy few months for less than $1 in 10 years :) You will also need that energy when you do the manual cell balancing so not even a few cents of savings.
Same will be the case for anything other than restive cell balancing (it is just not economical).
How does one unit manage to balance more than 7 batteries?
Seems like you would have to invest 300$ per 7pack of batteries... which would get very expensive very fast...
Is there a way of multiplexing the different clusters of batteries?
Like with relays or somthing like that, you could balance one pack at a time autonomously...
You connect many batteries in parallel
@@jehugarcia I see, tyvm.
hello
can i connect 2of 3s BMSs in series to get a 6s BMS ??
thanks
Do you need a BMS when having a MPPT charge controller??
yes, BMS has safety features like controlling discharge, temps(not charging below freezing or if it's overheated) etc.
I have a question. Can that 7s battery module system be used as a power bank setup or not
Huh ?
anyone knows if there is a difference in bms between lithium ion batteries and those lithium iron phosphate ???
Please put the the video to how to make a DIY battery at home.....
.
Ya and they are super well though out
Create Content as always, 🙏🏽 thanks jehu