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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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