Your solar panels should be able to get a maximum amount of light form the sun. If you are set against hiring a professional to assist you, you can start tracking the sun's movements yourself to calculate the best positioning.
Don't walk on solar panels unless you really need to. They cost a lot of money, and you don't want to inadvertently damage them. Do not walk on the ends, as they are the most unstable parts.
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When researching for a good solar panel installer, don't forget the Internet. Yes you may start out in the phone book, but the Internet will give you a lot more information as well. You may find testimonials from other clients and ideas for contractors that you may not have realized are out there.
If you are considering installing a solar panel system, it is important that the panel faces in the sun's direction. Although this seems obvious, you would be surprised how many people forget this step. If your panel does not have sun, it won't power up. If you live in the Northern hemisphere, your panel should face South towards the horizon.