I knew there was a way to get away from using everybody’s expensive proprietary crap batteries. Just hadn’t had the chance to prove the theory yet myself. Thanks John! 😊
The batteries are not necessarily crap but we pay a super premium for the proprietary connections! Great video and flawless work in the disassembly and installation of terminals and reassembly . Great teamwork!!!❤
You are the man, i always wanted to hack into my power station rather than buying the batteries. This is amazing thank you for performing this great task y'all.
These fit nice where a Koolatron 2.3 in a semi goes. And his truck has 108" sleeper on it, with micro bath. With the HOS rules this will allow him to drive all night and sleep all day under AC and heat using the extra battery.
I picked up a factory refurbished Bluetti AC50B, I use it to power my cpap every night. It also pulls duty to run my soldering iron, heat gun, charge all my portable devices. They are certainly quality units. I will wait for big sales events to grab more of them. I do like the idea of having small units running specific appliances and trickle charging them from my main battery bank.
Do a video on it, make a full list including manufacturers and product. Not enough folks understand this. Hopefully RF Kennedy can bust that scam as well.
It will as if the main is taking longer just charge much slower and the percentage is expected to show the total of both batteries. Have not tried a big 105ah on it yet but using 4 of my 7 ah to make 48v I got a immediate drop of 8% then it hit up to 100% about 10 minutes later.
Massive adverts for Ecoflow, online here in Australia. Price drop??? Could be wrong. I highly doubt it. I couldn't believe how much they cost! Bluetti looks to be Highly rated. Haven't seen any Ads for those, Yet... I'm happy with my setup, for now. Can't imagine Needing anything else, so far. Other priorities on my agenda, for my Toyota 2007 Hiace Van, with 744,000+ km. Found some bargain alloy wheels & a mate found some good, barely worn tyres. A big list of things to replace. Brakes done, suspension next.
You should get you a JDM engine on the way for that van, 744,000km is a chunk of wear. I wish they sold them here, I would love a 4x4 van like it to do some converting on, but trying to get one in 2018 from Germany was so expensive I had to pass on it.
@@JOHNDANIEL1 Cool. I bought it about 4 years ago, for $3,000, with 711,000. It was a ex Taxi bus, which ran super clean on a LPG system in Queensland, hence the high milage. I'm north of Newcastle, in Port Stephens NSW. Beautiful Place, almost surrounded by water. I don't travel too much these days. I'll never need to leave here unless I go to visit other family members. I'm the youngest of 6 & most of those had Vans, when I was young. My mum would say "Take him with you please!" Mostly trips down the South coast. 2 brothers still live down that way, by the water. Great memories! The old VW Combis took double the time to get there & back. Good times!
My self wouldnt even try to open unless i could balance unbalanced battery. Or if the battery is damaged and do a diy project that most component's were usable. Great video for referance. Otherwise i would do a full diy power station.
If you are connecting a battery with it's own BMS your doing nothing more than adding that extra available watt hours to the main unit. No balancing or alterations to the internal battery are done or will need to be done. You can add four 50 amp hour 4S for 48V to it, no difference in how it sees the power. Already a few viewers have emailed me their success on adding over 150AH to a Jackery and a EcoFlow following the same basics. Only the "proprietary" tracking to the power stations maker via wifi and bluetooth tracking is being monkied with.
@JOHNDANIEL1 just mean if by accident I caused an unbalance or over discharge and the solar generator was old and got damaged. My first station was a mebo that became unusable. I used it before it was charged at all. Seams like it took a few charges than the thing went up to 100 percent after couple minutes when half depleted from microwave. Thing would not charge more the battery was imbalanced. Took it back because it was unusable and already order and arrived bluetti. If they didn't take it back I would try to balance it. If that didn't work I would diy the thing to work with other batteries.
I like to see the follow up video to show the run time with added battery and how much current is being pull from the added battery at full load and how much current goes into the battery during charging.
It would be a balanced amount based on either ones ability. Each one will defer to the other as voltage support as their storage levels drop in use or Charge in refill.
Those are a different story, the prismatic welds are a issue, so you take the cell out, leaving as much of the tab as you can and then using a bolt style cell replace it with large washers to fill the hole your making working off the old cells weld.
@@JOHNDANIEL1 Just a thought...Could one cut the busbar at the 90 ( where it begins to hump) then guesstimate - with some looking and penciling - where the original bolt hole was, drill down lightly, hoping to hit center of the hole then tap a new M6/M8/M10 hole ( as there appears to be sufficient "meat" around the hole just NOT down into the hole at the base).
I considered adding another external battery to the EB3A, but as it turns out, it's got a "24v" 7s2p LiFePO4 internal battery. Not sure how to balance that with an external 8s2p 24v. I figure it was originally designed to a different lithium chemistry cell.
The eb3a accepts 12-28v through the solar input you can connect a 24v battery or 2 12v batteries in series to charge at 24v . You are only limited to the watts the bms will accept.
@williamirelan9332 While true, neither option actually increases the battery capacity for the device in a commonly rechargeable manner like a parallel group of cells would.
So I assume you could pull the 48v from the internal bluetti battery...if so would the amperage be limited by the bms or is it bypassed ? Great video, thanks
I haven't watched the whole video yet but my first impression is why void the warranty on a $1200 piece of equipment when you can attach the 48v battery to the solar input ?
You can't direct attach a 48 volt to the solar. Anything over 15 volts is considered by the unit as open volt solar MPPT range and you will destroy it sending it unlimited "solar watts" and amps. Feel free to try though. As for warranty, the reason we selected Bluetti is they have one of the lowest fail rates already in the industry. Was worth the extra $90 to buy the popular one.
@JOHNDANIEL1 According to the manual page 16, the solar input accepts 12v-145v the bms limits the input to 15a 1200w . There's no reason you can't input 48v .
@@williamirelan9332 I agree. You can simulate solar with batteries or a DC power supply. All you have to ensure is a) the source power is capable of the charge rate set (adjustable in the power station app) and the voltage of the source power is within voltage spec for the solar input. Off topic: A modification video worth doing would be to attach a wifi board (ESP8266) to the Swipower inverters remote port so that it can be turned on and off via phone app without having to be close by.
@@williamirelan9332 That is true but you will lose power going through the mppt port. That is, using the external battery, you have a conversion efficiency loss through that port to charge the internal battery. So, for example, if you connect a 2048Whr external battery, it will only add 1843Whr of charge to the internal battery at a 90% conversion efficiency. Also, you will need to charge the external battery separately but it looks like if you add the extra battery using his method, the extra battery will also be charged up by the bluetti. Precautions need to be taken when attaching his extra battery.
Exactly. Now you see why the added terminals for mass expansion options so the "car charging limits" do not hold it back. The semi truck this will go in next month has the Etaker 2000 charger going in it, 500 watts from auto input. So while he drives it will bank it all.
I do RV power systems for people. This was purchased by a person to use in a semi truck he basically lives in to be the power for it. Due to the battery being small I modified it so he could double the run time with a cheaper $350 battery plan without buying their $1100 battery that will not fit in the truck easily. I don't think the folks who made it would like my modifying it even though when they saw the video they offered me a discount code to share and $200 off on buying myself one.
Hi John and Kira. You are GENIUS. You just did what was swirling around in my head for a long time since these powerstation guys came up with the idea to get us hooked with their $$$$proprietary$$$$ extension batteries. Unfortunately I only have limited skills and I am not an electronic wizkid. Now this really allows to get creative. What I like about power stations is it´s all very compact. The whole wiring and connector story is professional engineered. AND it's portable. What really surprised me is the engineering quality and the little tools required for assembly.. Of course my thoughts go in direction of using 16 units big cells for 48V. The limits for solar will be the capacity of the charge controller of the power station or if more is required get the extension battery charged with a seperate system. There are two questions I have. Nº1 Will the charging system of the powerstation have enough capacity to charge a 15 kWh battery ? Of course it takes more time but I see no problem with that as long as the extension battery is controlled by it´s own BMS. Nº2 Why not completely eliminating the small battery of the powerstation and replacing it with just one big external battery to simplify the whole system.....So the new big battery bank gets controlled completely by the powerstation...meaning the BMS and AC-DC charging circuit ? In this case all the indicators should function perfectly because it´s the same BMS. BTW, I am a subscriber of Yours even before the wind turbines. Always enjoyed Your creative OUT of the box thinking. This is going to be exciting and BIG THXs. Looking forward to Your next videos and wish You a MERRY CHRISTMAS.
I think the fans and likely the Mosfets would age horribly bad using the internal charger to do all the work. Get a good 20 amp 48 volt charger or a 40 amp MPPT and 1000 watts solar to feed your spare. It will try to charge it, and it will show the total percentage of both as being one.
@@JOHNDANIEL1 At first sight I share Your concerns but I pretend a full off grid mobile system. So 99% of the charging is done by the DC solar charge controller of the power station. Don´t see a problem there. What certainly might be a problem is the mosfets of the BMS that will be on full power all the time to balance the much bigger cells. I wonder...could this be offset by connecting an active balancing board directly to the cells? That would also have the advantage to balance the cells when not being charged by solar. Of course that active balancer needs to be monitored seperate or it might create a negative effect and imbalance the cells. Let´s think of it like a maintenance balancing once in a while to take off the load of hard work from the mosfets of the BMS. Off course as a starter this needs A Grade cells that are perfectly balanced. Let´s say start active balancing somewhere in the upper curve above 3,5V of the cell. I believe those Powerstation BMS also do not start to balance at a lower voltage and usually they have a mosfet limiting capacity of 150-200 mAmp to prevent creating excessive heat. Those active balancing boards have a 2 Amp capacity. So for well balanced cells that should be more than plenty. I see the biggest problem from under sized solar. The cells are drifting away when not fully charged during prolonged time. What if the active balancer is programmable and starts balancing at the same voltage as the mosfets of the BMS ?Of course Your suggestion to charge the extension battery separately also has advantages...Meaning the battery of the power station is always full as long as the big extension battery has some juice.... OR will both batteries equalize after some time as You propose in Your video ???? Would be a $$$pity$$$ not using the charge controller of the power station. Of course with higher power demands an extra solar charge controller for the extension battery would be required to keep up with the loads as well as an extra AC 48V battery charger as You suggested or a DC 48V alternator. Being realistic with a 15kWh battery and 1000W solar in mobile application... this is plenty capacity to keep up with the loads and external charging will be an isolated case. Of course if we bring such loads like induction cooking, hot water and heating/air conditioning in the equation that would require thinking in other dimensions.
At first sight I share Your concerns but I pretend a full off grid mobile system. So 99% of the charging is done by the DC solar charge controller of the power station. Don´t see a problem there. What certainly might be a problem is the mosfets of the BMS that will be on full power all the time to balance the much bigger cells. I wonder...could this be offset by connecting an active balancing board directly to the cells? That would also have the big advantage to balance the cells when not being charged by solar. Of course that active balancer needs to be monitored seperate or it might create a negative effect and imbalance the cells. Let´s think of it like a maintenance balancing once in a while to take off the load of hard work from the mosfets of the BMS. Off course as a starter this needs A Grade cells that are perfectly balanced. Let´s say start active balancing somewhere in the upper curve above 3,5V of the cell. I believe those Powerstation BMS also do not start to balance at a lower voltage and usually they have a mosfet limiting capacity of 150-200 mAmp to prevent creating excessive heat. Those active balancing boards have a 2 Amp capacity. So for well balanced cells that should be more than plenty. I see the biggest problem from under sized solar. The cells are drifting away when not fully charged during prolonged time. What if the active balancer is programmable and starts balancing at the same voltage as the mosfets of the BMS ?Of course Your suggestion to charge the extension battery separately also has advantages...Meaning the battery of the power station is always full as long as the big extension battery has some juice.... OR will both batteries equalize after some time as You propose in Your video ???? Would be a $$$pity$$$ not to use the charge controller of the power station. Of course with higher power demands an extra solar charge controller for the extension battery would be required to keep up with the loads as well as an extra AC 48V battery charger as You suggested or a DC 48V alternator. Being realistic with a 15kWh battery and 1000W solar in mobile application this is plenty capacity to keep up with the loads and external charging will be an isolated case. Of course if we bring such loads as induction cooking, hot water and heating/air conditioning into the equation that would require thinking in other dimensions.
The BMS in the Power Station will not be affected by the additional battery. Both have their own BMS and the connection is made after the BMS and before the inverter.
@@JOHNDANIEL1 If you're not worried about charging speed, using the bluetti charger to charge both batteries shouldn't be a problem if you set the unit to a low (silent) charging speed.
I knew there was a way to get away from using everybody’s expensive proprietary crap batteries. Just hadn’t had the chance to prove the theory yet myself. Thanks John! 😊
Great point!
The batteries are not necessarily crap but we pay a super premium for the proprietary connections! Great video and flawless work in the disassembly and installation of terminals and reassembly . Great teamwork!!!❤
You are the man, i always wanted to hack into my power station rather than buying the batteries. This is amazing thank you for performing this great task y'all.
Super clean modification and installation. Now you can build your own battery bank without breaking the bank.👍👍👍👍👍
These fit nice where a Koolatron 2.3 in a semi goes. And his truck has 108" sleeper on it, with micro bath. With the HOS rules this will allow him to drive all night and sleep all day under AC and heat using the extra battery.
Great content as always! Thanks!
Very Nice teardown and Tips !!!!~~~~~~~~~
I picked up a factory refurbished Bluetti AC50B, I use it to power my cpap every night. It also pulls duty to run my soldering iron, heat gun, charge all my portable devices. They are certainly quality units. I will wait for big sales events to grab more of them. I do like the idea of having small units running specific appliances and trickle charging them from my main battery bank.
They sent me a discount code so I put it under the video. Not sure how much.
Stop eating the processed garbage food they're killing us with and you won't need a CPAP .
Do a video on it, make a full list including manufacturers and product. Not enough folks understand this. Hopefully RF Kennedy can bust that scam as well.
how is the anker compare?
watched the whole video looks interesting, nice to see the tear down how come you did not show how you added the new expansion battery terminals?
Did you connect the terminals you added in parallel to the battery or bms?
Looks good
Will the main unit's battery display account for the added capacity of the external battery you've connected?
It will as if the main is taking longer just charge much slower and the percentage is expected to show the total of both batteries. Have not tried a big 105ah on it yet but using 4 of my 7 ah to make 48v I got a immediate drop of 8% then it hit up to 100% about 10 minutes later.
I want The Eco Flow Delta 2 and 1300 Expanded now
Right on!
The new elite v2 teardown would be interesting
beautiful
Massive adverts for Ecoflow, online here in Australia. Price drop??? Could be wrong. I highly doubt it. I couldn't believe how much they cost! Bluetti looks to be Highly rated. Haven't seen any Ads for those, Yet... I'm happy with my setup, for now. Can't imagine Needing anything else, so far.
Other priorities on my agenda, for my Toyota 2007 Hiace Van, with 744,000+ km. Found some bargain alloy wheels & a mate found some good, barely worn tyres. A big list of things to replace. Brakes done, suspension next.
@vaughan7835 yeah Ecoflow ads everywhere but not many Bluetti
You should get you a JDM engine on the way for that van, 744,000km is a chunk of wear. I wish they sold them here, I would love a 4x4 van like it to do some converting on, but trying to get one in 2018 from Germany was so expensive I had to pass on it.
@@JOHNDANIEL1 Cool. I bought it about 4 years ago, for $3,000, with 711,000. It was a ex Taxi bus, which ran super clean on a LPG system in Queensland, hence the high milage. I'm north of Newcastle, in Port Stephens NSW. Beautiful Place, almost surrounded by water. I don't travel too much these days. I'll never need to leave here unless I go to visit other family members. I'm the youngest of 6 & most of those had Vans, when I was young. My mum would say "Take him with you please!" Mostly trips down the South coast. 2 brothers still live down that way, by the water. Great memories! The old VW Combis took double the time to get there & back. Good times!
My self wouldnt even try to open unless i could balance unbalanced battery. Or if the battery is damaged and do a diy project that most component's were usable. Great video for referance. Otherwise i would do a full diy power station.
If you are connecting a battery with it's own BMS your doing nothing more than adding that extra available watt hours to the main unit. No balancing or alterations to the internal battery are done or will need to be done. You can add four 50 amp hour 4S for 48V to it, no difference in how it sees the power. Already a few viewers have emailed me their success on adding over 150AH to a Jackery and a EcoFlow following the same basics. Only the "proprietary" tracking to the power stations maker via wifi and bluetooth tracking is being monkied with.
@JOHNDANIEL1 just mean if by accident I caused an unbalance or over discharge and the solar generator was old and got damaged. My first station was a mebo that became unusable. I used it before it was charged at all. Seams like it took a few charges than the thing went up to 100 percent after couple minutes when half depleted from microwave. Thing would not charge more the battery was imbalanced. Took it back because it was unusable and already order and arrived bluetti. If they didn't take it back I would try to balance it. If that didn't work I would diy the thing to work with other batteries.
A good guitar pick is a better wy then a screw driver.
I like to see the follow up video to show the run time with added battery and how much current is being pull from the added battery at full load and how much current goes into the battery during charging.
It would be a balanced amount based on either ones ability. Each one will defer to the other as voltage support as their storage levels drop in use or Charge in refill.
If you add the extra battery connections at the inverter PCB bolts, then you don't have disassemble as much.
How do/would you take apart a laser welded busbar if 1 cell is kaput yet keep the others and add a working battery to that pack for future use?
It's spot weld nickel tab, it'll just peel off with needle nose, you just have to drain the rest to bottom safe volts then do the work.
@@JOHNDANIEL1 Ok, I understand that, what about the "big boys" those prismatic 3.2 100+ amp hour cells in a power queen or ampere or...?
Those are a different story, the prismatic welds are a issue, so you take the cell out, leaving as much of the tab as you can and then using a bolt style cell replace it with large washers to fill the hole your making working off the old cells weld.
@@JOHNDANIEL1 Ok, thanks.
@@JOHNDANIEL1 Just a thought...Could one cut the busbar at the 90 ( where it begins to hump) then guesstimate - with some looking and penciling - where the original bolt hole was, drill down lightly, hoping to hit center of the hole then tap a new M6/M8/M10 hole ( as there appears to be sufficient "meat" around the hole just NOT down into the hole at the base).
I considered adding another external battery to the EB3A, but as it turns out, it's got a "24v" 7s2p LiFePO4 internal battery. Not sure how to balance that with an external 8s2p 24v. I figure it was originally designed to a different lithium chemistry cell.
The eb3a accepts 12-28v through the solar input you can connect a 24v battery or 2 12v batteries in series to charge at 24v . You are only limited to the watts the bms will accept.
@williamirelan9332
While true, neither option actually increases the battery capacity for the device in a commonly rechargeable manner like a parallel group of cells would.
So I assume you could pull the 48v from the internal bluetti battery...if so would the amperage be limited by the bms or is it bypassed ? Great video, thanks
@jime9305
I fugure this was intended to be a stand alone comment to John, and not a comment under mine.
I haven't watched the whole video yet but my first impression is why void the warranty on a $1200 piece of equipment when you can attach the 48v battery to the solar input ?
You can't direct attach a 48 volt to the solar. Anything over 15 volts is considered by the unit as open volt solar MPPT range and you will destroy it sending it unlimited "solar watts" and amps. Feel free to try though. As for warranty, the reason we selected Bluetti is they have one of the lowest fail rates already in the industry. Was worth the extra $90 to buy the popular one.
@JOHNDANIEL1 According to the manual page 16, the solar input accepts 12v-145v the bms limits the input to 15a 1200w . There's no reason you can't input 48v .
@@williamirelan9332 I agree. You can simulate solar with batteries or a DC power supply. All you have to ensure is a) the source power is capable of the charge rate set (adjustable in the power station app) and the voltage of the source power is within voltage spec for the solar input.
Off topic: A modification video worth doing would be to attach a wifi board (ESP8266) to the Swipower inverters remote port so that it can be turned on and off via phone app without having to be close by.
@@williamirelan9332 That is true but you will lose power going through the mppt port. That is, using the external battery, you have a conversion efficiency loss through that port to charge the internal battery. So, for example, if you connect a 2048Whr external battery, it will only add 1843Whr of charge to the internal battery at a 90% conversion efficiency. Also, you will need to charge the external battery separately but it looks like if you add the extra battery using his method, the extra battery will also be charged up by the bluetti. Precautions need to be taken when attaching his extra battery.
Awesome work john .
69w in from the lifepo kind of suck no?
Exactly. Now you see why the added terminals for mass expansion options so the "car charging limits" do not hold it back. The semi truck this will go in next month has the Etaker 2000 charger going in it, 500 watts from auto input. So while he drives it will bank it all.
A simuulaar battery did watt? (listen carefully folks)
ThumbUp &LeaveAComment 4AIgosAll
Not permanently own? So you got it for free in exchange for a positive review. So you basically have to modify first.
I do RV power systems for people. This was purchased by a person to use in a semi truck he basically lives in to be the power for it. Due to the battery being small I modified it so he could double the run time with a cheaper $350 battery plan without buying their $1100 battery that will not fit in the truck easily. I don't think the folks who made it would like my modifying it even though when they saw the video they offered me a discount code to share and $200 off on buying myself one.
Hi John and Kira. You are GENIUS. You just did what was swirling around in my head for a long time since these powerstation guys came up with the idea to get us hooked with their $$$$proprietary$$$$ extension batteries. Unfortunately I only have limited skills and I am not an electronic wizkid. Now this really allows to get creative. What I like about power stations is it´s all very compact. The whole wiring and connector story is professional engineered. AND it's portable. What really surprised me is the engineering quality and the little tools required for assembly.. Of course my thoughts go in direction of using 16 units big cells for 48V. The limits for solar will be the capacity of the charge controller of the power station or if more is required get the extension battery charged with a seperate system. There are two questions I have. Nº1 Will the charging system of the powerstation have enough capacity to charge a 15 kWh battery ? Of course it takes more time but I see no problem with that as long as the extension battery is controlled by it´s own BMS. Nº2 Why not completely eliminating the small battery of the powerstation and replacing it with just one big external battery to simplify the whole system.....So the new big battery bank gets controlled completely by the powerstation...meaning the BMS and AC-DC charging circuit ? In this case all the indicators should function perfectly because it´s the same BMS. BTW, I am a subscriber of Yours even before the wind turbines. Always enjoyed Your creative OUT of the box thinking. This is going to be exciting and BIG THXs. Looking forward to Your next videos and wish You a MERRY CHRISTMAS.
I think the fans and likely the Mosfets would age horribly bad using the internal charger to do all the work. Get a good 20 amp 48 volt charger or a 40 amp MPPT and 1000 watts solar to feed your spare. It will try to charge it, and it will show the total percentage of both as being one.
@@JOHNDANIEL1 At first sight I share Your concerns but I pretend a full off grid mobile system. So 99% of the charging is done by the DC solar charge controller of the power station. Don´t see a problem there. What certainly might be a problem is the mosfets of the BMS that will be on full power all the time to balance the much bigger cells. I wonder...could this be offset by connecting an active balancing board directly to the cells? That would also have the advantage to balance the cells when not being charged by solar. Of course that active balancer needs to be monitored seperate or it might create a negative effect and imbalance the cells. Let´s think of it like a maintenance balancing once in a while to take off the load of hard work from the mosfets of the BMS. Off course as a starter this needs A Grade cells that are perfectly balanced. Let´s say start active balancing somewhere in the upper curve above 3,5V of the cell. I believe those Powerstation BMS also do not start to balance at a lower voltage and usually they have a mosfet limiting capacity of 150-200 mAmp to prevent creating excessive heat. Those active balancing boards have a 2 Amp capacity. So for well balanced cells that should be more than plenty. I see the biggest problem from under sized solar. The cells are drifting away when not fully charged during prolonged time. What if the active balancer is programmable and starts balancing at the same voltage as the mosfets of the BMS ?Of course Your suggestion to charge the extension battery separately also has advantages...Meaning the battery of the power station is always full as long as the big extension battery has some juice.... OR will both batteries equalize after some time as You propose in Your video ???? Would be a $$$pity$$$ not using the charge controller of the power station. Of course with higher power demands an extra solar charge controller for the extension battery would be required to keep up with the loads as well as an extra AC 48V battery charger as You suggested or a DC 48V alternator. Being realistic with a 15kWh battery and 1000W solar in mobile application... this is plenty capacity to keep up with the loads and external charging will be an isolated case. Of course if we bring such loads like induction cooking, hot water and heating/air conditioning in the equation that would require thinking in other dimensions.
At first sight I share Your concerns but I pretend a full off grid mobile system. So 99% of the charging is done by the DC solar charge controller of the power station. Don´t see a problem there. What certainly might be a problem is the mosfets of the BMS that will be on full power all the time to balance the much bigger cells. I wonder...could this be offset by connecting an active balancing board directly to the cells? That would also have the big advantage to balance the cells when not being charged by solar. Of course that active balancer needs to be monitored seperate or it might create a negative effect and imbalance the cells. Let´s think of it like a maintenance balancing once in a while to take off the load of hard work from the mosfets of the BMS. Off course as a starter this needs A Grade cells that are perfectly balanced. Let´s say start active balancing somewhere in the upper curve above 3,5V of the cell. I believe those Powerstation BMS also do not start to balance at a lower voltage and usually they have a mosfet limiting capacity of 150-200 mAmp to prevent creating excessive heat. Those active balancing boards have a 2 Amp capacity. So for well balanced cells that should be more than plenty. I see the biggest problem from under sized solar. The cells are drifting away when not fully charged during prolonged time. What if the active balancer is programmable and starts balancing at the same voltage as the mosfets of the BMS ?Of course Your suggestion to charge the extension battery separately also has advantages...Meaning the battery of the power station is always full as long as the big extension battery has some juice.... OR will both batteries equalize after some time as You propose in Your video ???? Would be a $$$pity$$$ not to use the charge controller of the power station. Of course with higher power demands an extra solar charge controller for the extension battery would be required to keep up with the loads as well as an extra AC 48V battery charger as You suggested or a DC 48V alternator. Being realistic with a 15kWh battery and 1000W solar in mobile application this is plenty capacity to keep up with the loads and external charging will be an isolated case. Of course if we bring such loads as induction cooking, hot water and heating/air conditioning into the equation that would require thinking in other dimensions.
The BMS in the Power Station will not be affected by the additional battery. Both have their own BMS and the connection is made after the BMS and before the inverter.
@@JOHNDANIEL1 If you're not worried about charging speed, using the bluetti charger to charge both batteries shouldn't be a problem if you set the unit to a low (silent) charging speed.