Electrical Questions? Ask an Electrician Online.
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You have to figure your particular electrical load. 2 kw is usually enough to power mor ethna half the usage i a small house but it can vary a lot form house to house.
Here's a link to a chart tha gives you typical usage for common appliances.http://www.txspc.com/documents/WattageAppliance.pdf
I gave you the link to the chart above so you could figure out what your demand is. I can't size a system based on generalities and there would be an additional charge if you want me to do the calculations.