I fitted this meter to the solar panel charge controller on my motorhome. Previously I had relied on interpreting the red flashing light on the charge controller which was the only indication that anything was working and was not very efficient. I'd always been concerned about how much charge I was getting from the solar panel and had thought that maybe my leisure battery was needing renewal. What I discovered from fitting the meter was that the solar panel circuit was incorrectly wired up and for 2 years had never been working!!! What a difference this now makes to everything electrical onboard and it's pleasing to see the display on the remote meter providing us with fully charged batteries.