So if you buy more than one solar converter thingy....

My alarm bells were going off like crazy!!

You can ordinarily only use one per house. Did our hero look like a guy who owned two houses?

It's not an indication of nefarious activity, but it is decidedly odd. If you worked at an auto parts store and a single guy came in and bought a car battery two times in one week, you'd certainly think he was using them for something other than putting in a car. The solar converter's uses are more limited, so it would seem even odder.

Prepare your minds for a new scale of physical, scientific values, gentlemen.