IT IS SO ACCURATE AND HELPFUL TO SEE HOW THE INVERTER IS CHARGING AND ALSO HELPFUL IN DIAGNOSING ANY ISSUES YOU .MIGHT HAVE WITH YOUR INVERTER. Works great with the Schneider 2500W inverter. Really seems to rejuvenate the batteries, which is why I bought it. Had to modify the cabinet to make it fit. I have 4 6 volt T-115 batteries about 6 years old and just finished the Equalization charge.