MPPT PV vs Battery Voltage

I'm not from Renogy, but I know your answer: Yes, PV voltage an greatly exceed battery voltage and still run at high efficiency - but only if you are absolutely CERTAIN that you one of the more expensive "MPPT" models. (A cheaper "PWM" controller *must* have the all of the panels wired in parallel. You would buy a pair of the inexpensive "Y" adapters to bring the two parallel panels together into one wire to the charge Controller PV terminals. (They're sold in pairs, one "male" and one "female" on the t-wire side). You combine a couple of short PV "+" terminals into one "+"wire to the Controller, and the two "-" PV wires into one "-" wire from the controller.

With an MPPT, you can save on a little on power loss in the PV wiring (there's only half the current, at twice the voltage, of the parallel approach.) It also adds a bit of capability at the beginning and end of the charging day, when both panels together are running at high enough voltage to charge your battery - but each alone is below 13.2V, the minimum for "float" charging. But panels don't generate much power under those conditions. If clouds or other obstructions will often affect ONE panel alone, leaving the other in bright sunlight - then parallel connections would tend to reduce power loss from the sunny panel into the shaded one, even with MPPT.

Summary: with MPPT, you can go either way. But if you have a PWM charge controller, you MUST NOT wire them in Series - parallel connection, via "Y" adapters, is mandatory.