Bottom line...An 80 watt panel will be sufficient to charge the battery
enough to run your lights
, water pump and *Maybe* your furnace
blower on a daily basis with slight conservation.
It will not supply enough of a charge to use an inverter to run your microwave
.. and your air conditioner is totally out of the question to run inverted.
There are several ways to calculate your needs. This is an old, but valuable resource for getting an idea of your consumption 12v Side of Life
Since that was written, the common use of low voltage lighting
such as LEDs and Cold Cathodes comes into play. If you convert your rig to just low voltage lights
, and 80 watt system is about perfect if you don't watch a lot of TV or use inverted items frequently. Thats a generalization.. I don't know what your precise needs are.
I have converted to low voltage lighting
and "Get By" on 60 watts and am able to keep the lights
going daily, + water pump but have difficulty charging enough to run the heater blower on my furnace
on less than stellar sunlight days. I will be adding 20 more watts shortly in hopes that I can improve that.
(The catch 22 is that if it's sunny, I hardly need the heater LOL!)
Not knowing what AC you have, it's hard to say if the 2k watt genny will start it. Most won't, but there are quite a few here with that gen set that can chime in on thier experiences.