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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Remember to account for any extra influences when you calculate how much you can expect your solar panels to output. There are some intended outputs specified on panels, but that is only accurate if they are placed in an area that is sunny all the time. Any obstruction from trees or from a cloudy day will decrease the output.
Do not let a salesperson pressure you into purchasing solar panels. A solar energy system is an important investment and you should take the time to compare your different options. If a vendor feels the need to pressure you, they might not be confident about the quality of their products.