How do you calculate how much energy solar panels create in a month?

I am doing research on solar panels and I am having trouble figuring out how much energy each one can produce in a given span of time. Knowing this would help me to approximate how many I would need to offset certain consumers in my home.

What can anyone tell me about good portable solar power equipment?

I’m doing research on portable solar equipment, and there are a lot of companies out there that I’ve found. Anyone have any ideas as to what brands will hold up for long periods of hiking and driving? It would need to be able to power batteries for laptops, camcorders, and probably some smaller equipment like cell phones, iPods, etc.