Uses a PWM taper charge control to provide battery charge protection while maintaining a load on the windmill. User must supply resistive dump load such as air resistors or water heater element to dump power.
Used as a backup to provide load to a windmill if the primary load disconnects, preventing windmill over spin and damage. For example, if a grid tied inverter disconnects from the grid because the grid voltage goes down.
Allows a 24V windmill to be connected to a 48V battery. The most common situation is when a user upgrades from a 24V system to a 48V system and still wants to use the existing 24V windmill.