I currently have a 85 watt panel on camper roof, the controller is buried under the counter. Purchased as a kit and now not sure size of controller. It does a fair job of charging our 2 group 29 flood...
At 85 solar watts there is no wonder that you are having marginal battery recharging. General rule is one watt per wet battery amp hour. While you can do as you propose, you’d be better off to use matching panels of a larger capacity and one MPPT controller. Remember folding solar panels need to be setup every morning and taken down every evening or they grow legs. Roof mounted panels are usually working before you come outside in the morning.
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