Review on HQST PWM Solar Charge Controller, 20A Flush Mount with LCD Display, USB Port, 17 Load Controller Modes for 12/24V AGM, Gel, Flooded, Lithium Batteries by Brandon Micali

Worked great for 6 months. I used it in a detached weekend home. When I returned to the salon I found the batteries always 100% charged. I got there a few weeks ago and the batteries were at 83% (despite lots of Florida sunshine for a week) and then the next week they dropped to 79%. Now it has dropped to 64% without battery charging, even though the solar panel voltage is much higher than the battery voltage. It was fine while it lasted though - I like that it shows percent charge (most charge controllers don't). Update - it wasn't the charge controller that ended up failing - it was a small corrosion on the MC4 connectors which I fixed with CRC 2-26. Everything is fine now - I increased my rating from 2 to 5 stars.