I'm installing a total of six 210W panels. The panels are 24V each and I plan to connect pairs in series so that I have a 48V system with 3 branches in parallel. Per panel characteristics are Imax = 6.24, Vmax = 33.54, Voc = 39.66, Isc = 6.55. The system will charge a bank of 12V batteries.
On the MPPT calculator I need to enter system voltage, is that the 48V solar system or the 12V battery system? When I enter 48V it recommends the 100/20 MPPT controller, when I enter 12V it recommends the 150/60 MPPT. There's a huge cost difference between the two and of course I want to design for safety. Thanks in advance!