brac321

It all depends on how the MPPT algorithm is written in his charging controller. If his Vmp is 37 v/panel ?, with two in series he would get around 70v out in best case. Many of the 48v charging controllers need higher input voltage even to start operate efficiently. Perhaps there in its user manual is some kind of diagram about!? It should be... In the 48v systems I had build up in past decades the preferred solar inp. voltages were in range between 74 and 120 v DC. And the best efficiency was always around 85-95 v DC. But these systems are all with stand alone PV charging controllers (Morningstar, Midnite, etc).

Syed, on your schematic there are only 2 panels connected serial, is that ok? For 48v system charging most of the controllers need higher input voltage. 3 in series would be optimal config...