Half a kW for 'several hours' would need two and a half units every day, sunshine or not. That is why a large array might be needed. Depends on where he is, of course. Depends on the computer too - lap top or old fashioned CRT VDU.
What is needed to calculate is the Watt hours or kWh (units) electricity likely to be used and go from there. The value might be very different if he wants to run through the winter as well!
He might only need half a kWh but there are inefficiencies in inverter, batteries and the weather wherever he is. He might have 12V items, so doesn't need an inverter - he don't say. If he are near, or in, the arctic circle forget it - MnJoe's estimate might be too small for most of the year.
So, how long is this piece of string? We need much more information than has been given.
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Today's Featured Article - Women and Tractors, A Woman's Touch - by Teri Burkholder. I thought I would give you a little background on how I got myself hooked on tractors and their restoration. My family is a very "crafty" bunch of people. By crafty I mean good with crafts!! My Dad is a retired industrial engineer from Bucyrus Erie which made big shovels for excavating and he is also a wonderful wood worker. My mom and my "guardian angel" has had her own ceramic shop for 30 years and is an excellent painter. With these skills always active in our house it was hard not t
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