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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