to control or not to control and Mono or Poly
So the question now that we are here. existing set up is two group 31 agm batteries, all led lighting, 2015 fifth wheel with modern stuff. Panel is also unplugged at sunset and secured for theft prev...
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The reason you are getting away with not using a controller is most likely due to the tiny size of your solar panel charge current compared to the capacity of your two group 31 batteries. You are charging at barely above trickle charge rate for your battery bank. Moving from a 65 Watt panel to 100 is not likely going to change much, either. If you plan on using both (165W) I suggest you do get a charge controller. 165 watts can output about 8-9 amps in full direct sunlight.
