[RE-wrenches] Power Quality

I would like to follow up on a discussion of under what conditions an anti-islanding compliant inverter would have problems with the utility power quality and off grid inverters would have with generator-derived power quality. I think that Bill Brooks pointed to a document a while ago about spec

Re: [RE-wrenches] Power Quality

Peter: Excellent topic. Just two weeks ago I was working on two Xantrex XW6048 inverters connected to identical Kohler RES15 generators. One inverter would connect to the generator, one would not. I looked at the waveform with a very old, very cheap service scope. The waveforms from both

Re: [RE-wrenches] Power Quality

Try the PS 4000 Power Sight Power Analyzer (http://www.powersight.com/). You can log current, voltage, waveforms, transients, distortions, frequency, swells and sags, etc. You can get the graph and the data, so you don't have to judge the appearance of the graph. The PS3000 doesn't capture transien

[RE-wrenches] sub-panel supply-side tap

Hello, Ideally I'd like to make a supply-side tap on a feeder to a sub-panel. And I mean tapping the feeder line-side of the sub-panels 200 amp breaker. This is due to the limitations of the sub-panels 200 amp buss. My PV system max output is 80 amps and therefore requires a 100 amp breaker. A

Re: [RE-wrenches] sub-panel supply-side tap

Kirk, You may be doing a tap on the feeder at a point that is on the "supply side" of the sub panel, but this is not the same as doing a "supply side" connection per 690.49 (A). You are still doing a "load side" connection per 690.49 (B). You still need to look at the size of the feeder brea