I'm working on a solar project for my RV. If I install two (12 Volt) 140 Watt panels in parallel, run to a single charge controller and then to my battery bank, what happens if one of the panels gets partially or fully shaded during the day? I'm going with two smaller wattage panels due to space constraints on the roof and because of other stuff on the roof, there will be times of the day where I'll get some shadowing. If partial shade on one panel kills the output from both, would I be better to run two smaller charge controllers down to the battery bank? I've read that some (most?) panels now have blocking diodes built in. The battery bank is 4 (6 Volt) Trojan T105-REs wired for 12 Volts.