I put a 400w solar charger, which actually takes care of the house batteries, while in storage, but if the chassis battery did go down for some reason, and I have never had that problem, but if it did I'd use the "e" button to give a boost from the house batteries. It's more important to take care of my houe batterires (at least to me), I have a 40a controller that has all four stages. I have 6v batteries wired in series of course, and I maintaine them. I also have the AGS system, when your generator is suppose to start up automatically when the battery gets below a certain voltage, but never had to test that feature with the solar on the roof.
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