MrM1
I'm Here, But I'm Not All There
Planning to buy a Growatt SPF 48vdc 12kw 250. Already talked to Watts247 asked about over paneling. Said you can over panel the spf 12kw inverter / SCC.
Real Estate does not matter. The array is going in a 10 acre pasture field
The Growatt Manual says 7000w array and a max of 250vdc. Watts247 noted that I can use a larger array but the Growatt will only use 7000 watts and produce no more than 120a charge current at 48vdc system.
1st question. The Growatt spf 12kw 250 has 2 PV inputs for the solar charge controller (SCC) . Does That mean that each input takes 250vdc each... OR... does each input only take 125vdc each for a total of 250vdc
2nd question...
So our plan was to get 24 440w panels. VOC 193 / ISC each string 11. 5a x 6 = 69 amps. Growatt spf 12kw has 2 PV inputs so 34.5 amps each input.
Yeah, way over paneled, but does it matter? I'm planning for clouds and extra morning/afternoon generation. And planned to orient 2 of the 6 stings in different directions. 4 stings S, 1 SE and 1SW. If I'm wasting too much power from the array and we need it, I'd buy a second SCC.
BUT...
Can't find any 440w panels now. But found a deal on 370w panels.
28 panels gets me back up to the array size of the 440w panels. The ISC and VOC of the 370w panels are similar to (less than) the 440w panels so no problem there.
Problem is... Now I would have 7 stings and not 6 stings. 4 stings and 44amps on 1 pv input, and 3 stings 33 amps on the other pv input of the Growatt. Everything would still be under 200 vdc. 194vdc on pc1 and 194 vdc on pv 2.
Will this be a problem? Or should I add 4 more panels, 1 more sting to the smaller side to balance them out?
That would make the array 32 panels, 8 4s stings and a total of 11,840 watts 6 stings S, 1 string SE, 1 string SW.
Thoughts?
Thanks @tweekzilla @kromc5
@Hedges
Real Estate does not matter. The array is going in a 10 acre pasture field
The Growatt Manual says 7000w array and a max of 250vdc. Watts247 noted that I can use a larger array but the Growatt will only use 7000 watts and produce no more than 120a charge current at 48vdc system.
1st question. The Growatt spf 12kw 250 has 2 PV inputs for the solar charge controller (SCC) . Does That mean that each input takes 250vdc each... OR... does each input only take 125vdc each for a total of 250vdc
2nd question...
So our plan was to get 24 440w panels. VOC 193 / ISC each string 11. 5a x 6 = 69 amps. Growatt spf 12kw has 2 PV inputs so 34.5 amps each input.
Yeah, way over paneled, but does it matter? I'm planning for clouds and extra morning/afternoon generation. And planned to orient 2 of the 6 stings in different directions. 4 stings S, 1 SE and 1SW. If I'm wasting too much power from the array and we need it, I'd buy a second SCC.
BUT...
Can't find any 440w panels now. But found a deal on 370w panels.
28 panels gets me back up to the array size of the 440w panels. The ISC and VOC of the 370w panels are similar to (less than) the 440w panels so no problem there.
Problem is... Now I would have 7 stings and not 6 stings. 4 stings and 44amps on 1 pv input, and 3 stings 33 amps on the other pv input of the Growatt. Everything would still be under 200 vdc. 194vdc on pc1 and 194 vdc on pv 2.
Will this be a problem? Or should I add 4 more panels, 1 more sting to the smaller side to balance them out?
That would make the array 32 panels, 8 4s stings and a total of 11,840 watts 6 stings S, 1 string SE, 1 string SW.
Thoughts?
Thanks @tweekzilla @kromc5
@Hedges
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