I have 2x 100w panels in series, connected to a 100/50 MPPT, connected to a single flooded 12v Interstate deep-cycle battery.
The panel voltage and amperage both go greatly up and down inversely every 4 seconds in mildly shaded 12pm sunlight.
The indicator light on the controller shows bulk charging. When I open the app and view trends the voltage goes up to about 33volts for 2seconds, then drops down to 14v for 2seconds. It continued this cycle for hours until the panels were in direct sunlight and then is was better.
Is my MPPT faulty?
Is this because my panels are in series? And it’s simply due to shade?
Would parallel panels correct this issue?
How can I maximize my solar harvesting if I purchase 2 additional panels for my RV?
2 100w panels in series parallel connected to another 2 100w panels in series?