We keep our coach plugged in, with the battery disconnect off for the starting batteries. Our converter maintains a low current charge to the house batteries. So I periodically check the electrolite level in the house batteries. During the winter months, we turn off the refrigerator. The bus maintains its level for along time, but tends to settle in the front.
Despite concerns about running the engine when its cold, I do fire it up on mild days a couple of times during the winter, let it air up, release the brakes and move it a few feet, mainly to ensure the brake shoes don't stick to the drums over the winter. And if you do it on a regular basis it usually starts almost immediately.
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