Hi,
I've found one forum posting on a ground mount system that was quite a distance from the grid-tie in, but it doesn't exactly answer my questions. Any advice is greatly appreciated.
I'm doing a DIY 15KW ground mount system ~225 feet from my grid-tie in. 42 panels, 4 strings, two inverters (each with 2 MPPT) Total system specs shown at the bottom of this post. And panel (360W) and inverter (7000-MTLP) specs attached.
Most ground mount systems I see in my geography have the inverter(s) at the array, but based on my internet research it seems as if the advice for "long runs" is to remain in DC to keep wiring size smaller and put the inverter(s) near the grid-tie in. Based on an online wire size calculator - if I keep the 225-foot run in DC, I'm at 6awg. If I put the inverters at the array, I need to jump up to a wopping 1/0 wire for the 225 run.
My specific questions:
1. Do I have a bust in my math for the AC/DC wire size difference noted above? Ma
2. Assuming you concur that my 225-foot run should be DC, I will have 8 wires (4 pos, 4 neg) plus ground. What equipment/boxes/subpanels/combiners, etc do I need at the array(s) and at the house before I tie into my main breaker box? Just looking for wiring and equipment strategy advice.
Thank you and looking forward to hearing ideas/advice.
Steve
I've found one forum posting on a ground mount system that was quite a distance from the grid-tie in, but it doesn't exactly answer my questions. Any advice is greatly appreciated.
I'm doing a DIY 15KW ground mount system ~225 feet from my grid-tie in. 42 panels, 4 strings, two inverters (each with 2 MPPT) Total system specs shown at the bottom of this post. And panel (360W) and inverter (7000-MTLP) specs attached.
Most ground mount systems I see in my geography have the inverter(s) at the array, but based on my internet research it seems as if the advice for "long runs" is to remain in DC to keep wiring size smaller and put the inverter(s) near the grid-tie in. Based on an online wire size calculator - if I keep the 225-foot run in DC, I'm at 6awg. If I put the inverters at the array, I need to jump up to a wopping 1/0 wire for the 225 run.
My specific questions:
1. Do I have a bust in my math for the AC/DC wire size difference noted above? Ma
2. Assuming you concur that my 225-foot run should be DC, I will have 8 wires (4 pos, 4 neg) plus ground. What equipment/boxes/subpanels/combiners, etc do I need at the array(s) and at the house before I tie into my main breaker box? Just looking for wiring and equipment strategy advice.
Thank you and looking forward to hearing ideas/advice.
Steve
2 X Growatt 7000MTLP-US |
42 X AS-6M-360W (360W) |
(1) String of 11 (MPPT #1) (1) String of 10 (MPPT #2) (INV #1) and (1) String of 11 (MPPT #1) (1) String of 10 (MPPT #2) (INV #2) |
15,120W |
13,475W |
58A (Continuous Current) 72.50A (Max 125% Current) |
Load-side tie-in to existing MSP, with main breaker derated to 150A |
24,404kwhr |
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