Hi Bob,
thanks for thinking about my question!
I landed the fuses and put the fuses back in (not it- typo) on my sma
disconnect, and there was an arc across the fuse holder. Seems like it could
have been closing a short circuit on the bus once the parallel connection was
made.
--------
Hi Bill,
Although I am not entirely sure there is no ground fault,
I took the conductors off the terminals so they were in free air, and measured
pos to neg, pos to ground, neg to ground on both strings, and all I saw was the
taper towards 0 from about 20 vdc, and no steady voltage anywhere but pos to
negative. That makes me think the voltage is in a short circuit somewhere.
I cant yet make any conclusions about the wiring mistake because I had no
access
to the pull box where the different parts of the strings were connected to each
other and to the home run. I do think there might be a short circuit between
strings because when the fuse went back in there was an arc on the fuse holder
as if there was a short circuit instead of a simple parallel connection. I
guess
it might have had to do with the 2 different voltages, but there is voltage
'missing' somewhere.
Thanks for thinking about my question.
------------
Bob,
re: inverter capacitors charging, I havent seen that much of an arc with SMA
disconnects, and the switch was in the off position, so I dont think there was
any signal path to any real electronics. I always pull my fuses and do not
replace them until everything is landed and hot and the voltages look proper
when I install, and this arc was way out of range of normal.
re: backfeeding, I just suspected that too while thinking about your responses,
and yes the 2 voltages were different by about 200 volts.
Thanks for the thoughts Bob.
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