I suspect you may be in for a disappointment on this issue.
Recently I looked into a Solar Panels, Inverters, Battery Banks and GENERATOR system.
I was amazed to find that, to run 1 x 1000w constantly and 2 x 600w for 18 hours per day
- which I worked out at 24kWh, 10.8kWh and 10.8kWh (45.6kWh...