Hello wrenches, I am wrapping up a job that we adopted mid-installation, that has a couple grounding options. I am looking for the best way to do it. It is 18 x Solyndra SL-150-182 with 18x Tigos and an SMA 3000-HF. I am unfamiliar with the Tigo's and the Solyndra. As I understand it, Tigo's do not need any type of equipment grounding conductor.
The Solyndra's on the other hand, have a small piece of Aluminum square tubing used to support the tubes. We have a couple of wire change boxes up on the roof in various locations. Also, the homeowner has ran a large loop of #2 that circumnavigates the array and attaches directly to the grounding electrode at the service. The homeowner would like as much lightning protection as possible. My preferred grounding method would be to connect each of these aluminum frames to a grounding lug, and run a continuous piece of #10 solid and irreversibly spice in one of wire change boxes to the EGC and on to the inverter. However, this leaves that large loop of #2 Cu unused. I believe it's a bad idea to connect the frames to both the EGC in the pull boxes and the #2 loop, because we would have a ground loop. If we just connect the frames to the lightning loop, we may be disabling the gfdi circuit. What are recommendations wrenches have in this case? Should I use the lightning loop somehow? Thanks in advance -- Mac Lewis * "Yo solo sé que no sé nada." -Sócrates *
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