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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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