I have 840 watts of solar panels on the roof of my RV and one large Victron 100/50 charge controller. However, I can't get all 840watts because the 100/50 model has a 50 amp limit. Which limits the maximum draw from the roof at about 700 watts. I have a second 100/30 Victron MPPT charger controller for my ground port. I use it with a 100w foldable solar panel I put out for a little extra power when parked. I was wondering if you could parallel up the two charge controllers (input as well as output to battery). I thought by placing a diode in-line with a jumper wire from the rooftop (+) panel side to the 100/30 (+) side would prioritize the 100/50 on the roof panels but allow the 100/30 to assist. Anode side of diode would attach to the rooftop panel side with cathode side attached to the ground solar side. The idea is anytime the 100/50 rooftop charger reaches its maximum 50 amp draw from the roof and extra voltage bgins appearing on the input side of the charge controller, the 2nd down the line 100/30 would sense that and begin to draw energy from the roof top (as well as pull in my ground solar). All panels are 12v panels, ground and roof top. I know the MPPTs regulate input voltage by (and thereby solar panel voltage) via current draw. Would having two MPPTs on the same input line confuse the internal regulators too much? Like two people jumping up and down on the same trampoline?
