Hi Wrenches,
I have a bit of a puzzler that I’m trying to get sorted out. I’ve been
servicing a Grid-Tied Battery Backup system that’s about 17-18 years old. The
system comprises of 2-GVFX3648s in series, with 2-MX60(at least I think they
are 60s) CC’s. Each CC has 3 strings of 3 tied to it,
I would do 2 things. 1. If it’s string 3 fuse blowing, swap string 3 to another fuse. 2. Replace the fuse holder, which is what I suspect is the issue. It’s a weak connection causing heat which is causing the fuse failure. JayOn Apr 11, 2025, at 8:07 AM, Amos Post via RE-wrenches wrote:Hi Wrench
Hello Amos,
Have you checked for voltage imbalance for each string? If you have a bad
diode, that string may run low on voltage and be trying to send current
toward the weak string (this is the reason you have these breakers). I'd
run each string independently and see what Vmp is. If you are mi
One time I had similar, but different problem: 1 Amp ground fault fuse
consistently blowing, sometimes after 1 day sometimes after weeks/months.
I tried everything - replaced home runs, checked VOC, VMP, swapped DC input
into a different inverter, etc. it kept coming back to this one string. I
che
Wrenches, Amos, blowing of a 15 amp fuse is not a ghost in the machine, it
is an actual issue no way around it, shorted modules, shorted diodes, in
most cases it's a home run, way back when USE-2 white wure was failing and
would crack and break off mostly this would result in a GFI trip. The fuse
i
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