I want to make sure when I install my system (planned for next weekend) that I do the grounding properly. I am installing 24 canadian solar 250 watt panels (two strings) on a flat roof building using the ecofoot ballast mounting system. My inverter is a sunnyboy 3800.
For grounding I was planning on doing the following below. Please let me know if this makes sense.
Use continuous length of 10 gauge bare copper wire on each string and have these separate ground wires terminate onto a ground bus bar in a combiner box on roof. A separate 8 gauge thwn green stranded wire will leave combiner box and go down through conduit to a dc disconnect where ground wire terminates onto a grounding lug. Then separate 8 gauge thwn grounding wire goes through conduit and terminates onto one of the ground terminals (ground symbol without circle around it) inside the sunnyboy inverter. Then from other ground terminal inside sunnyboy inverter (ground symbol with circle around it) 8 gauge thwn through conduit to AC disconnect where there is grounding bar. Then another length of 8 gauge thwn through conduit to ground bar in electric service panel.
Does this make sense?
Also, I am confused by the two grounding terminals in the sunnyboy inverter. One with the circle around it and one without. Is it correct to connect the ground wire from dc disconnect to the terminal with the ground symbol without the circle and to connect the ground wire that goes to the ac disconnect and then service panel to the terminal that has the ground symbol with the circle around it.
For grounding I was planning on doing the following below. Please let me know if this makes sense.
Use continuous length of 10 gauge bare copper wire on each string and have these separate ground wires terminate onto a ground bus bar in a combiner box on roof. A separate 8 gauge thwn green stranded wire will leave combiner box and go down through conduit to a dc disconnect where ground wire terminates onto a grounding lug. Then separate 8 gauge thwn grounding wire goes through conduit and terminates onto one of the ground terminals (ground symbol without circle around it) inside the sunnyboy inverter. Then from other ground terminal inside sunnyboy inverter (ground symbol with circle around it) 8 gauge thwn through conduit to AC disconnect where there is grounding bar. Then another length of 8 gauge thwn through conduit to ground bar in electric service panel.
Does this make sense?
Also, I am confused by the two grounding terminals in the sunnyboy inverter. One with the circle around it and one without. Is it correct to connect the ground wire from dc disconnect to the terminal with the ground symbol without the circle and to connect the ground wire that goes to the ac disconnect and then service panel to the terminal that has the ground symbol with the circle around it.
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