It's easier to understand solar cells if you think of them like batteries. Solar panels are made of cells just like batteries. Also just like batteries solar cells can be connected in series and in parallel. Just like with batteries connecting them in series increase the voltage, and connecting them in parallel increase the current. Also just like batteries one bad cell can be a serious problem.
The most importing information for a potential buyer is the maximum watts a panel can produce and it's voltage. Other things buyers might be interested in would be the condition, how old they are , the manufacture, their dimensions, their weight and weather they are poly-crystalline or Mono-crystalline (you can tell this just by looking at them. Poly-crystalline is the one on the left).
I'm not a big fan of solar really. I think it's partial responsible for the high electric costs here in California. Still I would buy some panels if I could get them cheap enough.
For one thing utilities here are required to law to buy electricity from people with solar panels for the same price the would sell the electricity to them. This means that a person can reduce there electric bill to zero while still receiving all the benefits of using the electric grid basically pushing all the costs onto other costumers. That's not really something I want to do, but still it's like musical chairs you don't want to be the last person left standing.
Even in states which don't have the rule forcing utility to buy the electricity there are still reason why someone might want some solar panels if they could get them at the right price. Imagine if you could buy 500 watts of 12 volt solar panels for ten cents a watt. You can then hook them up in parallel to a cheap $100 12 volt inverted. That's a pretty sweet setup for only $150 bucks. Imagine taking that camping or maybe even using it in place of a small generator to save on gas.
If they are in good working order I'm sure you can find someone to buy them. Probably for more then ten cent a watt. The problem is finding that someone. E-Bay seems like the obvious place, but if you don't want to do that then maybe craigslist or other local classified. Here are some links that might help you.
Here is a place you can use to sell your solar panels online for free.
Used Solar electric Equipment
Here is some things about used panels that you might want to be aware of.
Used Solar Panels | Otherpower
Here is a list of the ten best solar panel forums.
10 Best Solar Power Forums | DIY Solar Power Systems
Hope some of this helps.
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