Another small battery option is using solar panels with batteries for household use.  Nor grid tie. Lighting and whatever you can heap on.  Not everything needs to run on AC. Lights and fridge are comfortable on 12 volts if you purchased them. Batteries should never be wired in parallel, but should be on separate circuits and chargers. Extra solar panels can be aimed somewhat toward sunup and some toward sundown. This reduces the hours that the night battery has to carry the load.