MedicineMom
New Member
We recently built a lithium battery 4p4s. Each cell is 304AH. We have an intellipower converter, and two generators a 4550W and an 8550W. We cannot get our bank to fully charge, and sometimes it won't make it through the night. The highest it's ever gotten is 13.4. I checked both sets of negative and positive terminals on the converter, and got 13.9 and 14.03.
When we installed the system, we did not have the proper tools available. All we had was a ratchet, and we arced two cells. All of the cells have the same voltage whenever I check them(with multimeter), they're monitored on a JK BMS.
Prior to these batteries, we had lead acid hooked up to the RV and over time, they seemed to have less and less capacity. It got so bad that nearly every night the batteries would die, or be close to it. I didn't care that much at the time because we already had the new bank. The new bank seems to be doing the same thing. So I thought maybe it's the RV. We found one bad ground, replaced that. A parasitic draw test produced 0.04a.
I cannot figure out how to determine if the battery capacity is shot due to the arcing(would the degradation increase over time though?), if the converter is not able to fully charge as it doesn't put out enough voltage, or if this ancient RV is just sucking power. We only run the furnace at night, we use a wood stove during the day.
My next idea is to disconnect the negative and test by turning off all the breakers, then flip them on and run the circuit one at a time.... But that probably wouldn't explain why we can't charge past 13.4
Would a capacity tester be of assistance here? If anyone has a link for one that would be appreciated.
Could the capacity be degrading due to never being fully charged?
Any help, advice, or input is greatly appreciated!!
When we installed the system, we did not have the proper tools available. All we had was a ratchet, and we arced two cells. All of the cells have the same voltage whenever I check them(with multimeter), they're monitored on a JK BMS.
Prior to these batteries, we had lead acid hooked up to the RV and over time, they seemed to have less and less capacity. It got so bad that nearly every night the batteries would die, or be close to it. I didn't care that much at the time because we already had the new bank. The new bank seems to be doing the same thing. So I thought maybe it's the RV. We found one bad ground, replaced that. A parasitic draw test produced 0.04a.
I cannot figure out how to determine if the battery capacity is shot due to the arcing(would the degradation increase over time though?), if the converter is not able to fully charge as it doesn't put out enough voltage, or if this ancient RV is just sucking power. We only run the furnace at night, we use a wood stove during the day.
My next idea is to disconnect the negative and test by turning off all the breakers, then flip them on and run the circuit one at a time.... But that probably wouldn't explain why we can't charge past 13.4
Would a capacity tester be of assistance here? If anyone has a link for one that would be appreciated.
Could the capacity be degrading due to never being fully charged?
Any help, advice, or input is greatly appreciated!!