A question about solar panels

[MarkP]

I stopped in to the little solar shop next door to J. Hara's a while back. The guy there was helpful and pleasant except for one thing. The 12 volt dc chest freezers were labeled with how many watts per day they used. I asked him about this and we went back and forth a bit before he condescendingly suggested that, since he had been doing this for a while, I should do more research before bothering him further. Didn't know what to say at that point.