[RE-wrenches] SB Power during countdown
Drake
drake.chamberlin at redwoodalliance.org
Sat Nov 6 20:17:21 PDT 2010
Hello Wrenches,
I'm troubleshooting an SWR 2100U. During the countdown, the inverter
begins producing power. There is a utility style kWh meter (Hialeah
meter) next to the inverter. During the countdown the wheel on the
meter spins fast for several seconds, then stops. The inverter
continues to count down and the green light continues to flash in the
waiting mode. The display on the inverter never says it is producing power.
The inverter blew its ground fault fuse. There is no indication of a
fault. I haven't Megger tested yet, but array produces around 500
Voc. With wires off the terminals, in free air, there are readings
of between 0.0 and 0.1 V to ground on both the positive and negative
wires. SMA tech support agrees that this is a very clean reading.
This inverter shows all the signs of being a glitchy unit, for
sure. The problem is that this is a replacement for the original
inverter that had very similar issues.
What would make an inverter produce power during the countdown? Is
this part of a larger pattern? Is there a problem with the system,
or did I get a second, problematic inverter?
Thanks,
Drake
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