Has been working for a week now and seems to be working fine. Operation of a 24 volt solar battery on a 12 volt battery with a capacity of 100 Ah. The battery stays at 13.7. I like multiple loading modes. Hard charging when the battery is low, too low and floating. It also has an excellent LED panel, it scans PV voltage, battery voltage, current fed to battery, battery charge and battery temperature. I charged my walkie talkie, phone and flashlight through USB ports. Everything seems perfect. It's a little more than I expected but a good block. I would definitely buy again.