That is a good solution. It can produce about 2 amps in clear sun - and very little in cloudy weather and none at night or indoors, of course. Assuming there is AC power available, there are a number of plug-in battery maintainers (not trickle chargers) that work well. I have had good luck with a small Deltran Battery Tender Junior, for example. If you do a Search of the Electrical sub-forum using the term "maintainer", you will find recommendations for other units.
The important thing in all cases is to start with a fully charged battery, then disconnect it from the TM entirely, to avoid all the parasitic loads that any RV has, and then to connect the panel or maintainer.
Bill
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