I'm putting together a 12v, 100Ah power box. I want to install a "safety switch" that can turn everything off when not in use. My initial thought is to install a big automotive type battery disconnect switch, but would I want to leave the BMS connected to the battery for monitoring? Another thought might be to put a smaller switch on one of the BMS control leads, that would turn the BMS off, and keep it from connecting power to any of the outlets. Any thoughts?
Building a 12v, 100Ah battery ?
- Thread starter Doug Wall
- Start date
The BMS that Overkill Solar sells can be controlled with a signal type switch (almost zero power) or it can be turned off with the Bluetooth phone app. However, there is a bit of current spike when connecting to an inverter. If the inverter is more than about 1000w, I would rather not be switching the battery to the inverter off and on. If you don't plan to pull huge current, you might consider a power connector coming out of the BMS and positive lines.
I think that I have it figured out! Here's the sequence- Power connections positive/ Master Breaker 100A/ Battery+/Battery-/ BMS (negative)/ Main cut off switch/ Power connections negative. All of the outlets/accessories running between the pos., and neg., will have individual fuses. That way the BMS will be connected to the battery, but be isolated from all accessories.
I am not sure I follow but if the BMS balance leads AND the BMS main negative are connected to the battery, you should be good.
Yes, that's pretty much it. I would have a 100A breaker and power switch where you have the power switch indicated. I was originally thinking of having the switch on the Neg lead, and the breaker on the Pos lead, but it would probably work either way.
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