Support Articles
No Export means the system is configured to not send any excess PV power back to the utility grid. All solar generation can only be used for home loads + battery charging; no grid export is allowed, complying with HECO CSS, NEM+, California NEM-MT and similar utility tariffs.
1.PV Generation & Curtailment Behavior
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Once the battery is fully charged (100% SOC) and home load is low, the system automatically curtails or disconnects PV strings (opens PV relay) to prevent surplus power from exporting to the grid.
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Non-export PV strings will never feed power to the grid, even during peak solar production.
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Inverter may activate frequency droop / voltage-based curtailment to locally reduce PV output instead of exporting.
2. Battery Charging Logic
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PV power first supplies household loads; remaining power goes to charge the battery.
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Battery charging priority is locked; excess PV cannot flow to the grid.
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When battery is full, charging stops immediately, and PV is curtailed to avoid any export.
3. Relay & Inverter Operation
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AC PV relay will open frequently during midday high sun + full battery to block export.
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Legacy/third-party AC PV inverters are forced to limit output via aGate PV relay open and frequency droop.
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DC PV MPPT will reduce power output to match only load + charging demand.
4. Grid-Tied Mode Behavior
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System blocks all reverse power flow to the grid.
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If PV production exceeds on-site consumption + battery charging capacity, the system must curtail PV—cannot push excess to grid.
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Compliance strictly follows utility non-export tariff rules, no accidental export allowed.
5. Backup / Off-Grid Mode Behavior
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No Export setting still applies; the system runs self-consumption only.
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PV still prioritizes home loads and battery charging.
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Overgeneration still triggers PV relay open and curtailment to protect against overvoltage/overfrequency (same logic as grid-tied no-export).
6. Energy & Economic Impact
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No credit for grid export (fits non-export utility plans).
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Higher self-consumption rate of solar energy.
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More frequent PV curtailment at noon when battery is full and load is low.
Summary Key Points
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No excess PV power is allowed to export to the grid.
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PV is automatically curtailed/relay-opened when battery full and load is low.
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PV power is restricted to only home load + battery charging use.
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Applies in both grid-tied and backup mode, following utility tariff rules.
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Causes more frequent PV curtailment and relay switching compared to export-enabled setups.
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