How do you know that they all died at once?
First tip off was that they are from harbor freight...
On really basic set ups like it sounds like you have it's really common to have a basic amp meter as well as a volt meter so you can see how many amps you are getting off the panels, that way you can tell right away that something doesn't look right because on a clear day or whatever, you should be getting a set number of amps if all the connections are good and there aren't any issues with the panels, get to much shading or something and your numbers will start dropping quickly.
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