How do you limit export to meet a G99 or G100 condition?
Short answer
Use an EREC G100 customer limitation scheme: the inverter or controller measures export at the connection point with a CT or meter and throttles generation or battery discharge to the agreed export capacity. Choose a fully type-tested scheme on the ENA register, and make sure CT loss or wiring faults fail safe rather than letting export run unlimited.
Last checked 24 September 2026 · 1 source
In more detail
- G100 Issue 2 Amendment 2 (2023) covers export and import limitation.
- MIS 3012 cl.3.5.22/3.5.36: CT housing/connection such that removal does not defeat limitation; monitor for CT faults.
- Manufacturer G100 declarations show response within 5 s and permanent fail-safe reduction on CT/signal loss.
- Software limiting of inverter Registered Capacity (G99 definition) is separate from G100 export limitation.
- Export limits constrain battery-to-grid discharge too (field evidence).
The facts, dated
- 01Current G100 version in use — Issue 2 Amendment 2 (2023)
standard · GB · checked 24 September 2026 · ena-eng.org
- 02Example CLS declared response time — 5 s
manufacturer · GB · checked 24 September 2026 · ena-eng.org
What we saw in the field
[QA review 2026-09-24] C1-5 ADDS: an export cap limits battery export too; size battery inverter and tariff strategy around the MEL. | Earlier notes: Customer 1's 5 kW export cap bottlenecked charge/discharge behaviour - addition: design battery power and tariff strategy around the export limit.
Sources
Last checked: 24 September 2026