By ac, I assume you mean 120vac, so that probably means tv, p c, DVD, satellite etc..
If that is so... But a "kill A watt" meter, about $20 at home depot
Plug it into the entertainment circuit, plug all your devices into a power strip that is plugged into the kill a watt, and then everyday for a week read the amount of power used
Once you know the real daily avg kilo watt hours used,
We can advise you on batteries and solar panels
I have 505 watts on the roof use the Onan for MW and coffee maker
And still find I need extra generator charging, we use a lot of power everyday
We full-time this is home , different needs for different life/use styles