Welcome to LiFePO4 club. Was gonna mess with the Li-NMC variants, but the nominal 3.6 volts per cell would've cause my inverter to have fits or scale it to have the same usable capacity. The nominal 3.2 volts per cell x4 on LiFePO4 mimics a typical 12 volt AGM battery profile to the point that most AGM chargers couldn't tell the difference and 12 volt nominal devices are able to use the full capacity of the battery pack without having too much fits. As for BMS using LiFePO4, most of them out there are pretty much junk and they claim that it will work them and I more of them on the not side. The ones that I've used are Ji-Kong (JKong BMS or JK BMS), JBD BMS (Jiabaida BMS or branded Overkill Solar BMS), and Daly Smart BMS. Each have their pro and cons, main pro is that you can customize the cell voltage limits via bluetooth connection and app on a phone or tablet. The only cons are they're pricy, but considering that they're programable you can use them on other lithium variants. I've been migrating my aging 100Ah AGM's to LiFePO4 for my APC SUA1500 UPS(s) and they've been working well so far. If you got cells from a reputable seller, they pretty pull about full capacity per manufacturer datasheet +5 to 10% for the first 10 full charge/discharge cycles. I've been following "Off-Grid Garage" for awhile and making plans to dive deep into the rabbit hole on larger LiFePO4 battery builds. I could do a turnkey approach, but what is the fun in that? :-P
Exactly on the "migrating", I totally get what you are doing :-) Yes yes, I need to find a BMS that actually works. My dear friend David Poz suggested the JK as well as the one from Overkill Solar (based on my notes). Good stuff Felax. I assume you have been offgrid for quite a while if you have mastered AGM's?
@@mark_osborne I am currently grid-tied and on 1 to 1 net metering. I do have 7.5 kWh of usable AGM storage for backup. I've been acquiring gently pre-owned telecom over the years, however they seem to be getting heavier every time I replace them as the years go by. Compare to brand new ones, at least they were affordable. My utility supplier is now stiffing me $30 minimum usage plus taxes for the privilege of being connected to the municipal grid and will be going to TOU rates in the next few years. Thus giving me the incentive to go self-consumption and have at least 60 kWh of storage. That way, I can take myself offline and sell off the excess solar that I don't use at peak rates. If I crunch the numbers right, it'll offset the minimum usage fees by 60% per year.
Very cool! Maybe in the next one you can share where you got them and how much. That charger sounds like it needs some promotion too. I'm getting ready to buy another 64. I have 64 of the older 272Ah Lishen cells. I'm going to get the Seplos DIY kits and make up 8 x 16s batteries for our off-grid system. They ain't cheap.
Cheap fixed supervisor IC BMS's typically have overvoltage cell at about 3.7-3.75v assuming you bought an LFP type BMS and not a LiPo BMS which is about 4.3v cut out.
Good morning Mark. I now ,y question is not related to this video but wanted to get it out there. Robert Osborne here. I used your video on wiring your combiner box. Do you have a video wiring a combiner box to a charge controller. I have a midnite solar classic 200. 8 solar panels 315 watt 69 volt 9.4 amp Wired 4 in series and then the two sets parallel to the combiner box. 48 volt battery bank. I was told wire up the batteries first. Thanks for the help
I'm sorry, I do not but it's pretty straight forward. The Midnight Classic installation manual will show you the connections. I'm looking at my Classic 200 right now, with the cover off, there are 4 large lugs, the far left goes to the battery (+), the next one to the right goes to the battery (-), the next one to the right is the white coming in from the combiner box, and the far right is the red or (+) coming in from the combiner box
Welcome to LiFePO4 club. Was gonna mess with the Li-NMC variants, but the nominal 3.6 volts per cell would've cause my inverter to have fits or scale it to have the same usable capacity. The nominal 3.2 volts per cell x4 on LiFePO4 mimics a typical 12 volt AGM battery profile to the point that most AGM chargers couldn't tell the difference and 12 volt nominal devices are able to use the full capacity of the battery pack without having too much fits.
As for BMS using LiFePO4, most of them out there are pretty much junk and they claim that it will work them and I more of them on the not side. The ones that I've used are Ji-Kong (JKong BMS or JK BMS), JBD BMS (Jiabaida BMS or branded Overkill Solar BMS), and Daly Smart BMS. Each have their pro and cons, main pro is that you can customize the cell voltage limits via bluetooth connection and app on a phone or tablet. The only cons are they're pricy, but considering that they're programable you can use them on other lithium variants.
I've been migrating my aging 100Ah AGM's to LiFePO4 for my APC SUA1500 UPS(s) and they've been working well so far. If you got cells from a reputable seller, they pretty pull about full capacity per manufacturer datasheet +5 to 10% for the first 10 full charge/discharge cycles. I've been following "Off-Grid Garage" for awhile and making plans to dive deep into the rabbit hole on larger LiFePO4 battery builds. I could do a turnkey approach, but what is the fun in that? :-P
Exactly on the "migrating", I totally get what you are doing :-)
Yes yes, I need to find a BMS that actually works. My dear friend David Poz suggested the JK as well as the one from Overkill Solar (based on my notes). Good stuff Felax. I assume you have been offgrid for quite a while if you have mastered AGM's?
@@mark_osborne I am currently grid-tied and on 1 to 1 net metering. I do have 7.5 kWh of usable AGM storage for backup. I've been acquiring gently pre-owned telecom over the years, however they seem to be getting heavier every time I replace them as the years go by. Compare to brand new ones, at least they were affordable.
My utility supplier is now stiffing me $30 minimum usage plus taxes for the privilege of being connected to the municipal grid and will be going to TOU rates in the next few years. Thus giving me the incentive to go self-consumption and have at least 60 kWh of storage. That way, I can take myself offline and sell off the excess solar that I don't use at peak rates. If I crunch the numbers right, it'll offset the minimum usage fees by 60% per year.
@@felaxchow207 yes yes, I get it. Energy providers (everywhere) are attempting to "squeeze" net metering customers
very nice setting!
Thank you so much
Very cool! Maybe in the next one you can share where you got them and how much. That charger sounds like it needs some promotion too. I'm getting ready to buy another 64. I have 64 of the older 272Ah Lishen cells. I'm going to get the Seplos DIY kits and make up 8 x 16s batteries for our off-grid system. They ain't cheap.
Cheap fixed supervisor IC BMS's typically have overvoltage cell at about 3.7-3.75v assuming you bought an LFP type BMS and not a LiPo BMS which is about 4.3v cut out.
Making a large battery are we? 64 of them lol
No kidding!😄
Good morning Mark. I now ,y question is not related to this video but wanted to get it out there.
Robert Osborne here. I used your video on wiring your combiner box. Do you have a video wiring a combiner box to a charge controller. I have a midnite solar classic 200.
8 solar panels 315 watt 69 volt 9.4 amp
Wired 4 in series and then the two sets parallel to the combiner box.
48 volt battery bank. I was told wire up the batteries first.
Thanks for the help
I'm sorry, I do not but it's pretty straight forward. The Midnight Classic installation manual will show you the connections. I'm looking at my Classic 200 right now, with the cover off, there are 4 large lugs, the far left goes to the battery (+), the next one to the right goes to the battery (-), the next one to the right is the white coming in from the combiner box, and the far right is the red or (+) coming in from the combiner box
@@mark_osborne thank you
If you don’t mind I will try to send a picture of both.
Thanks I will try to wire in the morning