It is always best to install your solar panels where they will get the most sunlight each day. It is important to check regularly for trees that may be overshadowing solar panels due to growth.
Keep your solar panels out of the shade. It might seem obvious, but your solar panels do need sun. Make sure that you are not installing them in the shade. Trim back the branches on surrounding trees if you need to. Failing to do so could cost you more than half your energy output.
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.