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OK, it was a bad lead on the multimeter. It was positional, so I wasn’t seeing it a lot of the time, but I had to bend the lead in a certain way to get it to contact the fuse, and that was what was causing the problem. Replace leads and everything is normal now. Thanks for all the very smart...

It was bulk charging, so probably around 120A. Fuse was slightly warm. Thanks for taking time to help with this by the way.

It was actually measuring directly touching the arms of the fuse

I noticed I had a huge voltage drop from my charger to my battery bank. As explored I found I had a 1.1 V drop across my blue sea ANL 400A fuse. With the current off, there’s almost no resistance across the fuse. I’m guessing it’s still a bad fuse and it’s inducing significant resistance when...

That did it, thank you!

I did, thanks!

I’m running a Multiplus 12/3000/120 connected to 3 diy 280Ah 12v LiFePO4 batteries, each with a Daly 150 BMS. Batteries run in series to a lynx distributor, then to the inverter. 4/0 wires the whole way. The inverter does fine with light loads, but if I put any decent load on it, I get a huge...

Thanks, that makes a lot of sense

A friend of mine recently gave me a lifepo4 battery he had built but only use for a month or two and project. It’s a 4s 280ah battery with a Daly 100a BMS. I want to expand the system to 200a 560ah, and I can get cells from the same vendor. I was wondering whether I should: A - use the...