Hi all;
I'm planning on buying/building an off-grid 5KW PV system with LifePo battery bank for my retirement home in the rural Philippines. Trying to figure out how many panels to buy assuming that I go with a Growatt SPF5000TL-HVM (5Kw) hybrid charger-inverter. The Growatt specs indicate a max input of 450VDC. However I read on different solar installer website that you should design an off-grid system with enough panels to provide up to 133% of the inverter capacity (which is 5,000 watts for this Growatt model), presumably to compensate for the lower real-life voltages from the panels due to less than max sunshine conditions? If I understand this correctly, then assuming the PV panels are 440watts (JA Solar) and are connected in series then I can connect 12 or even 13 panels in a single string? Would appreciate the advice of more experienced solar gurus out there.
A related question, what would happen to the built-in MPPT controller in a max full sun scenario? Would the MPPT charger shutdown or fry?
I'm planning on buying/building an off-grid 5KW PV system with LifePo battery bank for my retirement home in the rural Philippines. Trying to figure out how many panels to buy assuming that I go with a Growatt SPF5000TL-HVM (5Kw) hybrid charger-inverter. The Growatt specs indicate a max input of 450VDC. However I read on different solar installer website that you should design an off-grid system with enough panels to provide up to 133% of the inverter capacity (which is 5,000 watts for this Growatt model), presumably to compensate for the lower real-life voltages from the panels due to less than max sunshine conditions? If I understand this correctly, then assuming the PV panels are 440watts (JA Solar) and are connected in series then I can connect 12 or even 13 panels in a single string? Would appreciate the advice of more experienced solar gurus out there.
A related question, what would happen to the built-in MPPT controller in a max full sun scenario? Would the MPPT charger shutdown or fry?