Solar as battery maintenance during storage - opinions

I maintain our single Gr 27 AH TT battery with a 55W panel and a small Morningstar controller. You do need to measure your parasitic current draw and estimate how many hours of sun you will average to make sure you have enough AH capacity. I used to use a single 10W panel but I think that was not quite enough in the winter time. The 55W panel is overkill but it was bought for a dry camping trip to the Grand Canyon to supplement our generator since generator hours were very limited in that national park.

Dick