The user manual for my smartsolar MC4 model does not help me in deciding which way to wire up my PV panels to the unit. I only have 2 panels (390 watts each) and was originally going to wire in series and then into the pos/neg in's on the regulator. However the MC4 model regulators have several pairs of MC4 inputs which means I could just send cables from each panel straight into the regulator without having to series or parallel them at the panels first.
So, what is the most efficient way to wire these panels up please.
A little more info in Victrons wiring ebook and regulator manuals would be a great help.
My panels are 390watt Voc 75.3v Isc 6.55A.