Got my strings in series, 9xLongi 72cells single sided 540w panels, only one string for each inverter (3-phase).
Voc STC 49,50 - NOCT 46,54
Short Circuit Current lsc/A is STC 13,85 - NOCT 11,20
Current at max power Imp/A is STC 12,97 - NOCT 10,43
During summer I see max. 405V. Growatt SPF 5000 ES got a 450Voc max, 430 max useable.
Now in November it has gotten up to 425V. *Tiny bit sweating here now* ... :D
Still around 23C temps during daytime in the shade, nights atm. around 14-15C.
We CAN though have a few days during winter with down to 3-4C degrees in the morning only, back up to 15-25 during early afternoon again - but never any lower (9 years in same area).
No snow. Southern Spain - Andalucia. Solar irradiance locally is 577 max at 13:00 for tomorrow 05.11 f.ex.
EDIT to clarify: Should I connect the last panel in each string to parallell so the total string config is 8 in series+connect the last panel (no. 9) by swapping + and - on it?
I know this lowers the voltage to 360-373 acc. to my numbers above,
but will it also lower the combined strings output in watts if I do this?
Or will I see approx. the same possible max. output as now? 4860w?
Voc STC 49,50 - NOCT 46,54
Short Circuit Current lsc/A is STC 13,85 - NOCT 11,20
Current at max power Imp/A is STC 12,97 - NOCT 10,43
During summer I see max. 405V. Growatt SPF 5000 ES got a 450Voc max, 430 max useable.
Now in November it has gotten up to 425V. *Tiny bit sweating here now* ... :D
Still around 23C temps during daytime in the shade, nights atm. around 14-15C.
We CAN though have a few days during winter with down to 3-4C degrees in the morning only, back up to 15-25 during early afternoon again - but never any lower (9 years in same area).
No snow. Southern Spain - Andalucia. Solar irradiance locally is 577 max at 13:00 for tomorrow 05.11 f.ex.
EDIT to clarify: Should I connect the last panel in each string to parallell so the total string config is 8 in series+connect the last panel (no. 9) by swapping + and - on it?
I know this lowers the voltage to 360-373 acc. to my numbers above,
but will it also lower the combined strings output in watts if I do this?
Or will I see approx. the same possible max. output as now? 4860w?
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