When a solar plant is sized above its inverter rating, the clipped energy is usually written off. A DC-coupled battery captures that energy before the inverter, which changes the economics of a firm-power tender.
The trade-off is controls complexity. DC coupling ties the battery to the solar block, so the EMS has to arbitrate between charging and export in real time. On greenfield hybrid sites the recovered yield typically pays for that complexity within the first few years.
