One step at a time.
Besides... it's good enough for rough order of magnitude SWAG calculations.
/johnny
E (electricity) = M (Me or Marcella, take your pick)
I do it with D and AA high capacity rechargeable batteries and a 22 watt solar panel with smart charger attached.
I know you guys talk 12 volt and deep cycle batteries, etc., all too expensive for me, but I'm going back to my grandmother's time with no power at all and updating that with high capacity batteries, rather than just her oil lamps and nothing else in her house working with any kind of power, not even regular batteries. I can do better than she did due to products we have now.
I can have light and cooling myself with my batteries for years but I can't reproduce today's power for freezer/fridge.
So, the one thing I can't do is keep something cold. I've put off dealing with that, but I need to find the info. again on how it is done in third world countries - something about using several pottery pots in graduated order and it keeps things cool/cold. I must look that up and reproduce that method.