Bruce,
I ran across an interesting thread about batteries and discharge rates some time back:
https://www.physicsforums.com/thread...attery.482113/
There are several threads on FGRV that discuss how to get an alternator's power delivered more efficiently to the trailer's battery. There are also several threads that mention Peukert's curve.
Personally, I am still at the stage of trying to better understand "what I have" with my substantially stock
Casita. (This actually applies to
all of the trailer's appliances, equipment and systems.)
The battery is an newer Interstate Group 27 with about 95AH capacity, same as was supplied stock.
I am currently focusing on small incremental changes with a focus on the "load side" of the equation.
I have installed LED lamps which use about 16% of the power of the stock incandescent lamps. I have also mounted a Hella marine fan on a small plywood base. It can be very effective while drawing substantially less power than the Fantastic fan; it uses about 40% of the Fantastic Fans' low-speed draw.
Most batteries generally have a broadly similar capacity per a given volume (which correlates to weight). So, adding additional capacity whether by battery,
solar or
generator, can quickly become expensive in terms of money,
weight, and space.
You might be able to acquire some "additional capacity" by monitoring and adjusting the loads and usage.
I'm sort of thinking like Jimmy Carter in his cardigan sweater here...