Originally Posted by wrvond
It's just a single 100 amp Battleborn.
WFCO charge profile:
Starting with a deeply discharged battery
1) WFCO limits current to max charger can output (bulk charge is 50 amps minus what house is using)
2) Voltage slowly rises to 14.4 volts.
3) Time at 14.4 volts is limited to a maximum of 4 hours from start of bulk charge.
A 50 amp charger on a deeply discharged 100 amp Battle Born will get to nearly full charge in 2 hours. Two more hours are available for equalizing cells.
4) Voltage drops to 13.6 volts
Battle Born BMS equalizes then disconnects from charger. The BMS stays disconnected until battery voltage drops below reconnect voltage. I don’t know what the reconnect voltage is. It may be below 13.6 so the BMS may not reconnect until the battery self discharges and the WFCO goes to the next phase.
5) Voltage drops to 13.2 volts storage maintenance level. This occurs when WFCO current is stable and low for 4 days. Not sure about the time or how low the current must be.
6) WFCO voltage returns from storage level to 13.6 if current changes even a little bit. When the Battle Born BMS self discharges and reconnects, WFCO will jump to 13.6 volts and possibly to 14.4 volts if current draw is high enough.
The bottom line is the WFCO 50 amp without the Li switch is good for a 100 amp hour Battle Born battery. The WFCO may stay too long at 14.4 volts, but the BMS may tolerate that just fine (check with Battle Born). Battle Born maintains a web page showing chargers that Battle Born has tested and found acceptable.
It is marginal for a 200 amp hour Battle Born battery bank. Full cell equalizing from a deep discharge may be too short. Full cell equalizing from 20% SoC may work fine. (Check with Battle Born.)
Not all Li drop in brands are good with that. Some other brands require no more than 2 minutes of equalizing. Always check specification of both charger and battery. Other brands have different requirements.
Larger battery banks lead to other challenges. Fully programmable charging profiles may be needed. Check battery manufacturer’s specs.
I wish you good luck and happy trails ahead!