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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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