Hello, I just bought a new house and noticed we had solar panels on the roof looks to be 4 of them 4′ X 12′ . How do I tell the brand or how much theyre worth for that matter? I believe they are approx 5-10 yrs old…

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I was trying to look online for solar panels for my home to take some of the strain off of using oil and electricity but I find it very hard to understand exactly how they are used.
Like one that I looked up is 100 watts…..is that like a light bulb watt? How many things can that power?
Is it really cheaper in the long run because the panels are very expensive?
If anyone has web sites that can explain this to me I would appreciate a link, or anyone to answer part of my question.