Stick up cams do t work on solar!

I’ve got 12 stickup cams and 2 of them just won’t work with solar panels. All the others seem fine so far but these 2 seemed to work ok then the batteries just started draining. The panels are clean . I tried out one of the panels on a spotlight can also and it didn’t work on that cam either! How can I test the panels and does the spotlight cam need another type of panel? Support on fault diagnostics for the whole range of products is not good!!