PV Gap

Melissa Said:

About how large an area of solar cells would be needed to produce 2kWe of output power at noon on a clear day?

We Answered:

Taking a look at the spec sheet linked below, the panel is about 6 1/2 feet by 3 1/4 feet, and produces 270 watts peak. That means you'd get 225 watts or so under realistic conditions, so you'd need perhaps 8 or 9 of these.

If a house has a south facing roof, the area of the roof is rarely a limiting factor, by the way. Usually, it's either cost, or power needs that limit an installation.