wood-duck
Member
Hi!
I am planning on about 2600 Watts of solar on the roof (from 6x 430W panels), and I am trying to figure out which arrangement of parallel/series makes the most sense for a solar charge controller. I am not completely settled on 24V vs 48V, so perhaps this will help me make that decision too.
A couple questions:
- Am I doing this right?
- I am coming to the conclusion that 48V would make more sense given the 2600 Watts of solar and the currents that will produce, but I would be interested to entertain other opinions/considerations/ideas!
Panel Details:
- 430 Watt Mission Panels: https://es-media-prod.s3.amazonaws....anels/spec-sheets/M6-9BB-Data-Sheets-SX9Z.pdf
- P: 430 W
- Voc: 49.28V
- Isc: 11.24A
Configuration A: 2 parallel groups of 3 panels each
Total voltage (=3*Voc): 150V, with 25% safety factor 185V
SCC input current (=2*Isc): 23A, with 25% safety factor 28A
Configuration B: 3 parallel groups of 2 panels each
Total voltage (=2*Voc): 98.5V, with 25% safety factor 125V
SCC input current (=3*Isc): 34A, with 25% safety factor 42A
Charging current:
(Assuming a single charge controller, will be the same for either configuration)
24V system (=P/24): 107.5A, with 25% safety factor 135A
48V system (=P/48 ): 53.75A, with 25% safety factor 68A
Solar Charge Controller options:
For the 24V system I would need a charge controller rated for >135A, which I haven't come across, probably for a reason, so I would need to use 2 charge controllers rated for 70A.
- Option A: Something like 2x the Victron 250/70
- Option B: Something like 2x the Victron 150/70
For the 48V system I can do it all with a single SCC.
- Option A: 1x Victron 250/70
- Option B: 1x Victron 150/70.
After going through this it seems like 48V makes more sense. Assuming 48V, what are the merits of option A vs B? I am inclined towards option B: lower voltage, less expensive component, more resilience if a single panel gets shaded. Are there other things I should consider?
I am planning on about 2600 Watts of solar on the roof (from 6x 430W panels), and I am trying to figure out which arrangement of parallel/series makes the most sense for a solar charge controller. I am not completely settled on 24V vs 48V, so perhaps this will help me make that decision too.
A couple questions:
- Am I doing this right?
- I am coming to the conclusion that 48V would make more sense given the 2600 Watts of solar and the currents that will produce, but I would be interested to entertain other opinions/considerations/ideas!
Panel Details:
- 430 Watt Mission Panels: https://es-media-prod.s3.amazonaws....anels/spec-sheets/M6-9BB-Data-Sheets-SX9Z.pdf
- P: 430 W
- Voc: 49.28V
- Isc: 11.24A
Configuration A: 2 parallel groups of 3 panels each
Total voltage (=3*Voc): 150V, with 25% safety factor 185V
SCC input current (=2*Isc): 23A, with 25% safety factor 28A
Configuration B: 3 parallel groups of 2 panels each
Total voltage (=2*Voc): 98.5V, with 25% safety factor 125V
SCC input current (=3*Isc): 34A, with 25% safety factor 42A
Charging current:
(Assuming a single charge controller, will be the same for either configuration)
24V system (=P/24): 107.5A, with 25% safety factor 135A
48V system (=P/48 ): 53.75A, with 25% safety factor 68A
Solar Charge Controller options:
For the 24V system I would need a charge controller rated for >135A, which I haven't come across, probably for a reason, so I would need to use 2 charge controllers rated for 70A.
- Option A: Something like 2x the Victron 250/70
- Option B: Something like 2x the Victron 150/70
For the 48V system I can do it all with a single SCC.
- Option A: 1x Victron 250/70
- Option B: 1x Victron 150/70.
After going through this it seems like 48V makes more sense. Assuming 48V, what are the merits of option A vs B? I am inclined towards option B: lower voltage, less expensive component, more resilience if a single panel gets shaded. Are there other things I should consider?
