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Hi,
I currently have one string of panels connected with Solaredge Optimizers that lead to a junction box mounted on the racking and then transitions to THHN through EMT conduit mounted on the roof to the inverter.. Now, I want to install a Soladeck under a panel and route the wires through the attic. I also want to add a couple of more panels on a different roof plane and merge the two wire sets into a box but keep the strings separate and install them independently to each connection in the inverter.
Q1: What type of box would work? At first, I thought a simple 4x4 metal junction box but that doesn't seem right since I'll also need a ground bus or similar to combine the grounds. It's also probably too small for NEC and 6x 10 AWG wires and 2x 6 awg wires.
Q2: For the 6 awg ground wires, can I use grounding bushings for each leg of the EMT in the attic box and combine them in a ground bus bar and then lead one 6 awg wire to the inverter? I can make one ground wire continuous to the inverter but one will have to be 'spliced' in somehow so wanted to make sure this was ok for code.
Q3: Since I'm not combining the two strings into one, I don't need fuses/breakers like a string combiner has?
Sorry not an artist...
Thanks!
20220405_124838.jpg
I currently have one string of panels connected with Solaredge Optimizers that lead to a junction box mounted on the racking and then transitions to THHN through EMT conduit mounted on the roof to the inverter.. Now, I want to install a Soladeck under a panel and route the wires through the attic. I also want to add a couple of more panels on a different roof plane and merge the two wire sets into a box but keep the strings separate and install them independently to each connection in the inverter.
Q1: What type of box would work? At first, I thought a simple 4x4 metal junction box but that doesn't seem right since I'll also need a ground bus or similar to combine the grounds. It's also probably too small for NEC and 6x 10 AWG wires and 2x 6 awg wires.
Q2: For the 6 awg ground wires, can I use grounding bushings for each leg of the EMT in the attic box and combine them in a ground bus bar and then lead one 6 awg wire to the inverter? I can make one ground wire continuous to the inverter but one will have to be 'spliced' in somehow so wanted to make sure this was ok for code.
Q3: Since I'm not combining the two strings into one, I don't need fuses/breakers like a string combiner has?
Sorry not an artist...
Thanks!
20220405_124838.jpg
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