FilterGuy
Solar Engineering Consultant - EG4 and Consumers
I will be pleasantly surprised if the breaker makes a difference. The BMS in the battery is shutting down due to thinking the surge is a short circuit.... not because there is an ark. The breaker is not going to reduce the surge in any way.I have a 24v EG4 battery hooked up to a 24v Aeliussine 2000 watt Pure Sine Wave Inverter. The EG4 BMS is so sensitive that even with this "small", 2,000w, inverter it "sees" a dead short and shuts down every time I attempt to connect the inverter. My push-button, momentary switch with 40 ohm resistor, by-pass pre-charge circuit solves the problem as long as the inverter's own on/off switch is set to "off". Sig Solar (EG4 seller) suggests trying a 125A DC breaker as an inverter connect/disconnect switch because it fast snaps into full connect to minimize arcing... instead of the big, slow & sparky, rotary "Kill" switch that I've been using. Breaker arrives tomorrow. I'll see if it allows me to ditch the momentary pre-charge resistor circuit.
BTW: the EG4 has a sequence that will precharge for you, but it is one of those things where there are several buttons you must push in sequence so it is a bit of a PITA. If you are not aware of it you should look it up. (I don't remember the sequence off hand)