Reverse power

Reverse power (reverse power flow) is the surplus of the instantaneous balance between solar generation and local consumption, directed toward the grid. For an industrial connection sized for self-consumption (BTM), feeding in is not permitted, so the distribution system operator requires reverse-power protection: direction-sensitive metering and export limitation at inverter level.

Generation curtailed by the limitation is lost — unless battery storage absorbs it: the BESS uses the surplus as free charging energy and discharges it to the site in the more expensive hours. The exact degree of reverse-power exposure can be determined by a simulation run on the 15-minute consumption profile.

Detailed technical guide: Reverse-power protection for industrial systems