Bob,
Are you concerned that you might overcharge your battery? ie: boil off the water? What do you do with your car if you don't use it for a while?
I'm not saying you are wrong,,, or right. Just wondering. I turn off the coach & chassis disconnects. Power up maybe once per month during winter, start engine, & run generator maybe an hour, then shut down again & open disconnects.
The battery tender sounds like an inexpensive device that trickle charges forever. Yes? No?
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