Is there such a thing as a diagnostic meter to tell me what is wrong with my machine?
What exact device do you have? For example EasySolar-II GX ?
Some have built-in displays. Some need a connection to a computer via a USB MK3 cable.
What problem are you having?
Yes. Easy solar 5000. It trips out in the middle of the day.
There should be a GX device inside and that should be able to tell you something.