Review notes
- The entered export limit is 65.8% of the inverter AC nameplate. Ask whether the interconnection agreement requires a hard export cap, an approved power-control system, or another operating limit, and whether the proposal production model includes any resulting curtailment.
- Export limit and inverter AC capacity are different concepts. The export limit controls power sent to the grid; household loads may absorb part of solar output before export is measured.
- This checker does not convert the nameplate gap into curtailed kWh or a curtailment percentage. That requires time-series solar production, on-site load, storage behavior, export-control logic, and the applicable utility/interconnection rules.
Export limit is not the same as inverter capacity
Inverter AC capacity describes the maximum continuous AC output rating of the solar inverter configuration. An export limit describes how much power the site is allowed or configured to send to the utility grid. Those values can be different because the home may consume solar power before export is measured.
A proposal can also use an approved power-control or export-control system to keep grid export below an interconnection cap while allowing the solar array and inverter to serve on-site loads.
Why this tool does not estimate curtailed kWh
A 7.6 kW inverter with a 5.0 kW export limit has a 2.6 kW nameplate gap, but that does not mean 34% of annual solar energy is lost. Actual curtailment depends on when solar production exceeds the combination of on-site demand, storage charging and the permitted grid export.
Hourly solar shape, household load, battery dispatch, power-control behavior, roof orientation, weather and utility settings all matter. Ask for a production model that explicitly includes the export-control configuration if the cap is materially below inverter AC nameplate.
What to verify in the proposal or interconnection approval
- The exact combined continuous solar-inverter AC capacity.
- The approved grid-export limit and whether it is site-wide, phase-specific or equipment-specific.
- Whether a power-control system, export-control gateway or other limiting equipment is required.
- Whether the installer's annual production estimate models export curtailment and battery behavior.
- Whether the utility limit is an export cap rather than an inverter, service-panel or branch-circuit rating.
Frequently asked questions
What does a zero-export solar system mean?
A zero-export configuration limits power sent to the utility grid to zero. It does not mean the solar system produces zero power: on-site loads may still consume solar, and approved control equipment may regulate what reaches the grid.
Is a solar export limit the same as inverter AC capacity?
No. Inverter AC capacity is the continuous AC output rating of the solar inverter configuration. The export limit is a separate interconnection constraint on grid export.
Is an export limit the same as net metering or export compensation?
No. Net metering, net billing or another export-credit rule describes how exported energy is credited. The export limit describes how much instantaneous power may be sent to the grid.
Can I estimate curtailment loss from the nameplate gap?
Not reliably. You need time-series solar output, on-site load, battery dispatch, export-control behavior and the relevant utility settings. The inverter-to-export-limit gap by itself is not an annual curtailment percentage.
What is a power-control or export-control system?
It is equipment or control logic used to keep site export within an approved limit. Exact architecture, certification and utility acceptance depend on the installed hardware and applicable interconnection requirements.