Solar Lattice

Measurement

Curtailed energy not stored

ID
meas:curtailed-energy-not-stored
IRI
https://solarlattice.org/kb/meas/curtailed-energy-not-stored
Status
active

In PV-plus-storage plants, curtailment turns available solar resource into energy that goes unused. A DC-coupled or AC-coupled battery can recover part of that energy by charging. The battery can only capture curtailed energy if it has spare capacity, power headroom and control permission, and if its operating objective values the charge. Once the battery reaches its Maximum Off-Grid state-of-energy setting, it stops charging and solar output is curtailed. The Maximum Off-Grid state-of-energy setpoint is a controller parameter that can be read and written, so check it during a battery charging review. This pattern belongs to grid curtailment yield losses. A low performance ratio during curtailed hours may reflect grid instructions rather than a module, inverter or tracker problem.

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