Bidirectional DC Power Supplies

Bidirectional DC power supplies both source and sink current, moving smoothly through zero without switching instruments, and return absorbed energy to the mains instead of dissipating it.

EA Elektro-Automatik and Keysight cover this range. This capability is what battery, electric vehicle and energy storage testing needs, because a charge and discharge cycle is a single continuous test rather than two setups. Regeneration matters commercially as well as technically, since dissipating kilowatts as heat means both an electricity bill and a cooling problem. Check the transition behaviour through zero current and the regeneration efficiency, and confirm the mains supply can accept returned power.