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Size your panels based on the Ah of batteries you plan to install. For example I have two Trojan 6V 360 Ah batteries. Therefore I need only one 360 watt panel or 3 160 watt panels give nice “overage” for part shat etc. This will give you about 27 amps of output, 9 amps per panel.
What you are looking at would require about 1200 Ah of batteries, 1200/60 = 20 of the batteries that come with your coach - dual purpose. Or by weight 1,200 pounds of batteries.
The big problem is voltage loss due to undersized wiring. Look to install 6 to 8 g wires to your solar controller and then to your batteries. Skimp on this you loose big. Do a search for a voltage loss wire size calculator and it will show you loss versus amps vs voltage vs length.
1200/12 = 100 amp of charging will require some really big wires.
My system work, bought wire and controllers from Arizona solar. Have replaced several for folks who just don’t listen. It’s in the physics.
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