Solar Energy concerns

I was chatting with someone who mentioned these concerns about solar energy quotes:

What upgrades will/need to be done to the electrical panel and what do I need to do to ensure that I can expand
===How should I take care of my panels, do they lose effectiveness if they are extremely filthy People going around charging $200-300 or more to clean panels. You pay someone to clean your panels and you might as well not have panels

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