@Rick: I was wondering the same,that's why I posted. At least it's given a result
@Chris: I'm planning to use it at a camping site where I only need cooling. No other consumers present, apart from the incidental phone or MP3-player.
Since you actually use one, can you tell me if it's running fulltime on your weekend out? That's the one I'm curious about, since I'm calculating with only 25% running time. Plus, even if there is no direct sunlight, a solar panel will provide a (smaller) current. Let's say we have 15 hours of daylight. So, on an average summer day , we get about 5 hours of bright burning 1,5A, but the other 10 daylight hours will still give me a number of Amps.
I know, it's guessing. But that's also the fun of it for me.
Ericb