The more I get into learning about the Midnite Classic charge controller, the more great ideas come forth. This charge controller has two configurable AUX outputs. You can use these outputs to turn on/off accessory equipment. One example is turning on an exhaust fan at the end of a charge cycle when flooded batteries start to vent hydrogen.
A second useful idea is to turn on a dump load to use the electricity that would be wasted when the batteries are full. Missouri Wind and Solar makes a custom DC heater. It works at 12 and 24 volts DC. At The Cabin, it gets cold in the winter. I envision using one or two (or more) of these DC heaters to heat up my 8×8 well/pump house. This will probably not keep it from freezing, but will increase the efficiency of the batteries being stored there.