Hi guys,
I would be finalizing my PV design in the coming weeks. One thing that I have reconsidered from my original design was to use higher voltages on the PV side of thing.
I am considering 24 solar panels, probably the Canadian Solar CS6K-280M (Vmp 31.5, 38.5 Voc, Imp 8.89) or the Heliene 72m-360 (39.71 Vmp, 48.19 Voc, 9.13 Imp).
I would like to have 2 ground mounts of 12 panels each (IronRidge racking, 4 x 3 configuration) and connect all 12 panels per ground mount in series. That would be 378V @ 8.89A for the CS and 477V @ 9.13A for the Heliene. Each set of 12 panels would have a Schneider Conext MPPT 600-80 charge controller. The PV array operating voltage on the Conext MPPT 600-80 is 195V to 550V. The maximum PV array open circuit voltage is 600V on that thing. It should be more than ok with the CS (462 Voc) but will be close to its limit for the Heliene (578 Voc).
The two ground mounts will be located 200 to 300 feet from the garage (where the inverter/CCs will be). I am considering using 10 AWG wires (at 2% acceptance loss), and a buried PVC pipe for each array to the garage.
So, here are my questions:
1. do I need a DC combiner box? I would think not because everything is connected in series
2. each set of 12 panels will have a DC disconnect switch in the garage. With a 25% safety margin, I guess I should be looking at a 600V/15A DC disconnect switch - something like that: https://www.amazon.ca/Square-HU361RB.../dp/B00ZJIOA40 -- is that correct?
Thanks!
I would be finalizing my PV design in the coming weeks. One thing that I have reconsidered from my original design was to use higher voltages on the PV side of thing.
I am considering 24 solar panels, probably the Canadian Solar CS6K-280M (Vmp 31.5, 38.5 Voc, Imp 8.89) or the Heliene 72m-360 (39.71 Vmp, 48.19 Voc, 9.13 Imp).
I would like to have 2 ground mounts of 12 panels each (IronRidge racking, 4 x 3 configuration) and connect all 12 panels per ground mount in series. That would be 378V @ 8.89A for the CS and 477V @ 9.13A for the Heliene. Each set of 12 panels would have a Schneider Conext MPPT 600-80 charge controller. The PV array operating voltage on the Conext MPPT 600-80 is 195V to 550V. The maximum PV array open circuit voltage is 600V on that thing. It should be more than ok with the CS (462 Voc) but will be close to its limit for the Heliene (578 Voc).
The two ground mounts will be located 200 to 300 feet from the garage (where the inverter/CCs will be). I am considering using 10 AWG wires (at 2% acceptance loss), and a buried PVC pipe for each array to the garage.
So, here are my questions:
1. do I need a DC combiner box? I would think not because everything is connected in series
2. each set of 12 panels will have a DC disconnect switch in the garage. With a 25% safety margin, I guess I should be looking at a 600V/15A DC disconnect switch - something like that: https://www.amazon.ca/Square-HU361RB.../dp/B00ZJIOA40 -- is that correct?
Thanks!
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