I mounted my solar controller in the battery bay just above the hydraulic pumps on the left and an inverter on the opposite wall to the right . It fits nicely, snug but near the batteries and all in one spot. I travel in poor weather alot and it stays really clean in there. I did have to move the splices and overload breaker down a bit on the right hand wall, same as I see in your picture for the inverter. My panels are on the roof.
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