John Frum
Tell me your problems
- Joined
- Nov 30, 2019
- Messages
- 15,233
The lesson is a never run a lithium ion battery without a BMS.
The other lesson is lifepo4 is certainly safer than "explody" lithium chemistries.
The lesson is a never run a lithium ion battery without a BMS.
I see you figured it out.Unfortunately I dont know how to test the voltage on each string.
I agree they are probably all damaged. If he has the skills he can try to revive it but it is not for the faint of heart. First he needs to pull down those overvolt modules with a headlight or big resistor. Then he needs to try to slowly see if he can charge the remaining brick. Then attach a BMS and do a capacity test, watching the cell voltages as they reach the knee at the top of charge cycle and bottom during the discharge cycle. I would do the first capacity test with very conservative settings watching for a runner. Then if everything remains balanced he could be more aggressive to see if he has any useful capacity left and no cells bricks that much weaker that the others.With the 5 zones at over-volt of 4.3-4.4, they are likely damaged. With the 6th zone at 0.97V, definitely damaged. Could this be salvaged in some way? Possibly, but it would take some knowledge and detailed testing.
Thank you guys. I really appreciate all your advice and help. Very sad now that my entire system is down.You just confirmed the module is destroyed. Sorry. Very fortunate you didn't experience a fire.
Hopefully one last question. If I get a battle Born battery, I should switch the charge controller to the po4 setting correct? And will I need a BMS for just one or two batteries?
The Battleborns are going to be very spendy and you'll have about 1/2 the capacity you did prior. Another Telsa module with a suitable BMS is probably still more cost effective per kWh.
I am partial to LiPo as I have about 39kWh of individual 24Ah LiPo cells from Ford Fursion Energi packs. My build is going to happen one day...
I would be surprised if they were trully Lipo, aka LiPoly or Lipol. I suspect they are some form of NMC chemistry with Cobalt. They are manufactured by Panasonic.I am partial to LiPo as I have about 39kWh of individual 24Ah LiPo cells from Ford Fursion Energi packs. My build is going to happen one day
I would be surprised if they were trully Lipo, aka LiPoly or Lipol. I suspect they are some form of NMC chemistry with Cobalt. They are manufactured by Panasonic.
Victron's built in lifepo4 profile is good enough in terms of voltages for a lifepo4 battery but you should adjust the default absorption charging time to suit your setup. If you have a Victron shunt you can use the tail current method, if not you may find that 15 mins is sufficient to bring the battery up to 28.4V and let it do any cell balancing.Hopefully one last question. If I get a battle Born battery, I should switch the charge controller to the po4 setting correct? And will I need a BMS for just one or two batteries?
Battleborn batteries have a built in BMS.Hopefully one last question. If I get a battle Born battery, I should switch the charge controller to the po4 setting correct? And will I need a BMS for just one or two batteries?