Loading... Please wait...Robinson ALC 1275 (level controller)- $125.00 - Use the ALC1275 controller to control the on/off cycles of your solar pump. Just place the supplied wire into the tank or trough to be monitored and the controller will turn the solar pump on when the water level drops. Great for cattle troughs! The ALC1275 can be used with both the BL40D or BL40Q solar water pumps.