Grounding question - two strings on separate roof planes
Located in Oregon. Just wrapping up our DIY solar install and have a question about grounding.
System info:
SE-7600H-US
40 Hyundai 305w panels (290 STC)
I have 2 strings, one is east facing and the other is west facing. Under each string I have a SolaDeck junction box. From each SolaDeck I have 3/4" EMT which runs to a single double gang box in the attic. From this box I have a single 3/4" EMT running to the inverter. I have 6 AWG bare copper coming from the racking equipment into each SolaDeck. My original plan called for #6 to come off the roof, combine somewhere and then run to the building UFER. Now I'm reading my ground needs to be continuous... I don't want to run two separate #6 grounds and I don't want to run a #6 ground up and over the ridge (connecting the two racks together). So, after doing some reading, I'm thinking maybe I could run two separate 10 or 12 AWG THHN ground wires all the way back to the service panel? I'm thinking I would also need to bond one of these to the EMT along the way? I'm not sure this would pass due to lack of lightning protection? I really want to avoid having the ground wire exposed on the outside of the house.
I plan on grounding the AC side of the SolarEdge separate from equipment ground on the roof.
Any thoughts or suggestions? I have a call into the inspector, but it's hard to get in touch and I need to wrap this up while I have help.
Located in Oregon. Just wrapping up our DIY solar install and have a question about grounding.
System info:
SE-7600H-US
40 Hyundai 305w panels (290 STC)
I have 2 strings, one is east facing and the other is west facing. Under each string I have a SolaDeck junction box. From each SolaDeck I have 3/4" EMT which runs to a single double gang box in the attic. From this box I have a single 3/4" EMT running to the inverter. I have 6 AWG bare copper coming from the racking equipment into each SolaDeck. My original plan called for #6 to come off the roof, combine somewhere and then run to the building UFER. Now I'm reading my ground needs to be continuous... I don't want to run two separate #6 grounds and I don't want to run a #6 ground up and over the ridge (connecting the two racks together). So, after doing some reading, I'm thinking maybe I could run two separate 10 or 12 AWG THHN ground wires all the way back to the service panel? I'm thinking I would also need to bond one of these to the EMT along the way? I'm not sure this would pass due to lack of lightning protection? I really want to avoid having the ground wire exposed on the outside of the house.
I plan on grounding the AC side of the SolarEdge separate from equipment ground on the roof.
Any thoughts or suggestions? I have a call into the inspector, but it's hard to get in touch and I need to wrap this up while I have help.
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