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EnergyFaults — error codes and troubleshooting for energy devices
Solar Inverters
1011 (UN-G-V)

Solis

Solis 1011 (UN-G-V)

AC grid undervoltage detected

Severity

Moderate

Safe to continue?

No

Technician required?

Recommended

Last verified

September 2026

First safe check

Verify that the property has grid power and that the inverter breaker is on before reporting the code.

What does 1011 (UN-G-V) mean?

The inverter has detected that AC grid voltage is below its permitted lower threshold and has ceased operation. It will resume when the supply returns to the configured window.

Which models use this code?

Verified for

  • Solis

Not yet verified for: individual model series. This code is recorded at brand level until a document confirms it per family.

Most likely causes

01

Conditions outside the inverter operating window

Manufacturer documented

The protective threshold this alarm reports has been exceeded for the AC or DC side of the system.

02

DC-side or battery-side disturbance

Possible

Array voltage, insulation resistance or battery communication behaviour triggered the alarm.

03

Measurement or internal hardware deviation

Rare

If the alarm returns immediately on a known-good installation, the cause is likely inside the inverter and needs service access.

Safe checks you can perform

  1. 1

    Note the code and the time it appeared

    Record the exact alarm text shown on the inverter display or monitoring platform — this is the single most useful detail for your installer.

  2. 2

    Check the visible power path

    Confirm the AC breaker for the inverter is on and that the DC isolator is in the position described in your manual. Do not open the enclosure.

  3. 3

    Check the battery indicators if a battery is installed

    Note whether the battery and BMS indicators show power and whether the alarm only appears during charge or discharge.

These steps stay outside the enclosure. Never open high-voltage equipment, bypass safety devices or work on live wiring.

When to stop troubleshooting

Stop and contact a qualified technician if the fault returns immediately, the device smells burnt, visible wiring damage exists, the enclosure is hot to the touch, or the manufacturer specifies professional service.

Can a reset clear this fault?

Reset behaviour is not documented for this code. Use only the manufacturer-approved restart sequence described in the device manual, and treat a code that returns immediately as an unresolved fault rather than a reset problem.

Related symptoms

No grid errorNot producing power

Related fault codes

1010 (OV-G-V)AC grid overvoltage detected1014 (Backfeed)Grid backfeed condition detected1015 (NO-GRID)Grid not detected1018 (OV-G-I)AC grid overcurrent detected1021 (OV-BUS)Internal DC bus overvoltage1023 (UNB-BUS)DC bus voltage unbalanced

Sources

  • Solis Service Center — Alarm and Error Messages

    View
    Manufacturer
    Solis
    Document version
    —
    Section / page
    Alarm and error message list
    Verified
    September 2026

    The inverter has detected that AC grid voltage is below its permitted lower threshold and has ceased operation. It will resume when the supply returns to the configured window.

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Disclaimer

EnergyFaults provides informational troubleshooting guidance. Electrical and high-voltage equipment should only be serviced by qualified professionals where required. Always follow the manufacturer documentation for your exact model.