SolarDIY

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SolarDIY is a vibrant community dedicated to embracing the power of solar energy. Here, we encourage you to showcase your ingenious ideas, innovative projects, and inspiring stories, while also seeking valuable advice, fresh ideas, and fostering meaningful connections.

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pdavis@lemmy.world

Battery fuse per-string and also main parallel fuse both required? (programming.dev)

submitted 3 months ago* (last edited 3 months ago) by CandleTiger@programming.dev to c/solardiy@lemmy.world

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I have a 300Ah 12V LiFePO4 battery setup with three 100Ah batteries (internal built-in BMS in each battery) in parallel. I have it fused at the parallel junction with a 400A fuse.

I want to put a 125A MRBF fuse on each battery instead. If I do install per-battery fuses, is there a reason to keep the combined big fuse as well? I see wiring guides recommending both but I'm not seeing any explanation for why.

The reason for moving is that the current fuse gets way too hot when pulling 300A sustained. I don't have room in my setup to easily install the really big fuse holders with heat sinks that are made to handle 300+A sustained current. (Yes, I checked the voltage drops across all my connections. They are very low. It really is the fuse getting hot and not a weak crimp etc.)

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