I hooked up a motor on my son in laws barrel last weekend. Everything was new except the solar panel. I checked it was a meter at home (without installing it) and it worked great. I get to the lease and hook everything up and the digital timer is acting weird and saying the new battery was dead. I had charged several brand new ones. I tried a different battery with the same results. I disconnected the sole panel and everything worked great. Not sure why that happened but long story short he will buy a new solar panel. Nothing worse then finding out opening morning your stuff hasnít been working because of a weak link.
For the same reason Iíll never use a plastic lid ever. Something chewed a hole in one years ago and basically I ended up with a barrel full of fermented corn on opening morning. Ha
I would say get a new one that you know works.
I once drank muddy water out of a hoof print and was dang glad to get it.