underdog5004
Solar Enthusiast
I have six life Power Batteries 48 volts all in parallel to a bus bar. Number two wire between the batteries and the bus bar.
I noticed that one of my batteries was only showing three lights when the others were showing four lights state of charge. At first I was worried about the capacity. I hooked up my computer and check the BMS and yes the battery with only three lights was showing a capacity remaining of 78 amp hours while the others were showing full 100. I was very worried that I had lost capacity in this battery. The state of health still showed 99.8. Actually it's not state of health anymore it just shows remaining ampacity.
Before I called Signature solar for a warranty replacement I decided to turn off my other batteries and drain the One battery with the three lights. As I drain the battery I noticed that the voltage was not dropping as I had expected and even after I pulled 78 amps out of the battery the voltage was still around 51 volts. Encouraged, I continued to drain the battery until it was at 48 volts, 3 volts per cell. After recharging this battery it shows 100 amp hours of capacity or really 99.8.
From this experience I decided that the battery was fine but the state of charge had drifted. So this is just a public service announcement that the state of charge measurement can drift, obviously, and the way to reset that that I found was to drain that battery down to 48 volts and then let it recharge.
This battery bank usually never dips beneath 75% state of charge. My loads are simply not great enough compared to the incoming solar power. Just wanted to let everyone know.
I noticed that one of my batteries was only showing three lights when the others were showing four lights state of charge. At first I was worried about the capacity. I hooked up my computer and check the BMS and yes the battery with only three lights was showing a capacity remaining of 78 amp hours while the others were showing full 100. I was very worried that I had lost capacity in this battery. The state of health still showed 99.8. Actually it's not state of health anymore it just shows remaining ampacity.
Before I called Signature solar for a warranty replacement I decided to turn off my other batteries and drain the One battery with the three lights. As I drain the battery I noticed that the voltage was not dropping as I had expected and even after I pulled 78 amps out of the battery the voltage was still around 51 volts. Encouraged, I continued to drain the battery until it was at 48 volts, 3 volts per cell. After recharging this battery it shows 100 amp hours of capacity or really 99.8.
From this experience I decided that the battery was fine but the state of charge had drifted. So this is just a public service announcement that the state of charge measurement can drift, obviously, and the way to reset that that I found was to drain that battery down to 48 volts and then let it recharge.
This battery bank usually never dips beneath 75% state of charge. My loads are simply not great enough compared to the incoming solar power. Just wanted to let everyone know.
