Make ice while the sun shines. To paraphrase an old farmer's adage.
Batteries weigh up rapidly, and have a short life expectancy. LIPOs and other Lithiums have not lived up to their billing in serious voyaging . The technology is not mature enough, nor is the
hardware reliable enough as far as I can determine.
The best
storage medium is "work done". That is to say do
work while you have energy. The most obvious case is ice. Instead of running a
refrigerator that mindlessly cycles based on a thermostat, day or night, it only makes sense to make ice while you have energy. An "ice battery" is
cheap, and never wears out.
Water can be frozen and thawed an infinite number of times. I did the weight calculations on
water / ice, as compared to
battery storage some time back, and found that it outperforms lead acid
batteries in energy stored per pound, unless you run them down more than is recommended. It does it at what amounts to zero cost, and zero
maintenance.
Lithium batteries will outperform ice on a pound for pound basis, but at a very high cost in comparison. I propose running a
freezer when one has surplus energy, freezing ice to use for an ice box. The whole affair could be a
single system with a tiny circulating fan, or it could be a simple as transferring frozen containers from
freezer to ice box. Higher gravity
beer actually works quite well as an "engineered fluid"
Other options of course include things like running a
watermaker while you have
power, running a slow cooker or
electric pressure cooker, or anything else that is periodic.
H.W.