I've been using the LCB 10A Solar Pump Controller for my off-grid cabin's water system, and it's been a revelation. My 24V solar pump used to be completely useless on cloudy mornings - now it chugs along reliably even in overcast conditions.
The real magic happens at dawn and dusk. Before this controller, my pump would only operate during peak sunlight hours. Now it starts pumping water at first light and keeps going until sunset, squeezing every possible drop of energy from my solar panels.
Installation was straightforward - just connect your solar panels, pump, and optional float switch. The four LED indicators could be more informative, but once you figure out their meanings (trial and error worked for me), they provide adequate system status updates.
One important note: this isn't a true linear current booster despite the name. It won't boost voltage on cloudy days, but it does prevent complete shutdown during low-light conditions. For my needs - maintaining water pressure between two storage tanks - it's been perfectly adequate.
The thermal protection feature has saved my pump multiple times during extended pumping sessions. While some users report overheating issues, I've found that proper pump sizing and occasional rest periods prevent this in my setup.