time2roll wrote:
Maybe 2oldman can share how much voltage bounce back is seen after running the air conditioner or microwave.
Using Battle Born - 20% SOC = 12.9v resting and another LFP's BMS low voltage cut off is at 10v +/- 0.2v (Don't know what us typical BMS shut off)
If total voltage drop from an inverter load of X amps is 0.6v, at 20% SOC inverter will see 12.3v well above its alarm, but then you run the load for a time to get some AH as the voltage comes down.
You could run it to when inverter shuts down at 10.5v while battery is at 11.1v which is well above the BMS shut down of 10v. Battle Born 11.1v resting is about ? SOC (12.0v= 9% and 10.0v = 0 dead)
Pretty close though--watching TV with its lower amps draw and less voltage drop would have the battery voltage lower when the inverter sees 10.5, but that is closer to the BMS shut off.
Then the furnace starts up and adds to the total draw so inverter sees 10.5. You don't want to miss the rest of the TV show, so leave some for the furnace!
If the BMS did get triggered, you need to get the battery bank working again. You have a "reconnect" voltage of 11.x or ?? a "reset" button some have. Is the reset for the BMS at any voltage or do you have to get the batts up in voltage if the "bounce back" is not to the "reconnect" voltage
BMS shut off from here:
https://www.canbat.com/downloads/CLI100-12.pdf
