D
davelondon
Guest
I'm planning to use three of these 550W JA Solar panels in series:
There's a couple of different Open Circuit Voltages listed on the spec sheet - "STC" and "NOCT":
STC: 49.9V (149.7V for three in series)
NOCT: 46.68V (139.44V for three in series).
I had imagined a 150V MPPT controller would be fine, but looking in the Victron spec sheet, they say 145V max for "start-up and operating maximum":
Should I be using STC or NOCT for the calculation? Is it good practise to have some headroom in the maximum voltage? Or can you take it right up to the maximum with no extra wear on the MPPT controller? Do I need to step up to a 250V MPPT controller for this array?
There's a couple of different Open Circuit Voltages listed on the spec sheet - "STC" and "NOCT":
STC: 49.9V (149.7V for three in series)
NOCT: 46.68V (139.44V for three in series).
I had imagined a 150V MPPT controller would be fine, but looking in the Victron spec sheet, they say 145V max for "start-up and operating maximum":
Should I be using STC or NOCT for the calculation? Is it good practise to have some headroom in the maximum voltage? Or can you take it right up to the maximum with no extra wear on the MPPT controller? Do I need to step up to a 250V MPPT controller for this array?