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I look at it the other way - I like having the panels on my roof. When I later add battery storage, I'll be able to keep the lights on during power outages. And maybe my purchasing them helps finance the industry a little bit so further improvements can be made.

I don't rely on door-to-door salesmen to give me detailed information about my energy consumption. There are plenty of calculator online, and reputable solar companies ( who do not sell door-to-door in my experience ) will be happy to help you understand.

Unfortunately the people going door to door aren't likely to be competent enough to do that. If its a good company, these are just qualifying leads and passing them back to sales staff. Hopefully those are better, and that's really your best option if you want to get deep into the details.

Your door-to-door salesman is charging 4x what you could pay somebody not on the take. Home Depot, likewise.