I have 2x100w flexible panels on my roof. The max wattage I get through these is roughly 50 watts (my advice, never buy flexible panels, too much efficiency loss in heat). Amperage is thus around 4. I would like to add another 100 watt panel (rigid). Can I run the wires of the new panel directly to my mppt 75/15 controller and join them there with the existing ines? Or do I need to join them before?
I think the 75/15 could handle 3 x 100 watt panels (12v) if two of the panels mostly operate at 25% efficiency, right?
Thanks a lot in advance.