<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:Courier New,courier,monaco,monospace,sans-serif;font-size:12pt">Hi Bob,<br><br>thanks for thinking about my question!<br><br>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.<br><br>--------<br><br>Hi Bill,<br><br>Although I am not entirely sure there is no ground fault,<br>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.<br>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.<br><br>Thanks for thinking about my
question.<br><br>------------<br><br>Bob,<br><br>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.<br><br>re: backfeeding, I just suspected that too while thinking about your responses, and yes the 2 voltages were different by about 200 volts.<br><br>Thanks for the thoughts Bob.<br><br><br><br><br><br></div></body></html>