- Solar and energy
- Solar inverter
Ground I Failure
GoodWe Ground I Failure on a solar inverter: high ground current
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
The GoodWe inverter has detected ground current that is too high and has disconnected from the grid. Note the message and time, do not touch the panel wiring and ask your installer to check the system.
Safety first
Stop and check this first
- Although the manual mentions unplugging the PV generator inputs, that step is not for you: GoodWe restricts operation and maintenance to qualified professionals.
Safe checks you can perform
- Message and time of the alert
- Repetition and conditions of the fault
- PV input separation and AC check
Leave these tasks to a qualified professional
- Do not attempt this professional task: Insulation of each string to earth
- Do not attempt this professional task: AC system and earth check
- Do not attempt this professional task: Reconnection and inverter status
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Insulation of each string to earth
What they doWith the system disconnected, the installer measures the insulation resistance of each PV string to earth to locate the leak.
They must show youeach string's measured value against the manufacturer specification.
In writingwhich string or connector failed and what was repaired.
AC system and earth check
What they doThe installer checks the peripheral AC system and the continuity of the inverter earth (PE) conductor.
They must show youthe AC side readings and PE continuity against the specification.
In writingwhat was found and what was corrected.
Reconnection and inverter status
What they doAfter the repair, the installer reconnects the panels and checks the inverter status, as the manual describes.
They must show youthe inverter in Normal and a history with no new Ground I Failure.
In writingtest date and result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Message and time of the alert
- Who:
- you, no tools.
- How:
- read the message on the inverter display or in the SolarGo app or SEMS Portal, without touching the unit or the cables.
- Result that matters:
- that the alert is Ground I Failure (or Ground I Fail) and when it appeared.
- If the red fault LED is still on:
- the fault is active; do not try to reconnect anything.
- If the alert is no longer active:
- still note it; a leak can come back.
- Evidence to keep:
- photo of the display or app screenshot with date and time.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW · XS SERIES USER MANUAL Ver2.6 EN
Repetition and conditions of the fault
- Who:
- you, no tools.
- How:
- check the Error History menu on the display or the alarms in the app and note how often it appears and in what weather. GoodWe asks for fault time, frequency and weather before you contact it.
- Result that matters:
- whether the fault is one-off or repeats.
- If it repeats often:
- report it to the installer as a persistent fault.
- If it always matches rain or humidity:
- note it so the installer can take it into account.
- Evidence to keep:
- screenshot of the history with dates and weather notes.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
PV input separation and AC check
- Who:
- a qualified PV installer.
- How:
- disconnect the PV generator inputs and check the peripheral AC system; once the problem is cleared, reconnect the panels and check the inverter status.
- Result that matters:
- which side the leak appears on.
- If the leak disappears without the PV inputs:
- it points to the strings or their connectors.
- If it persists without the PV inputs:
- it points to the AC system or the inverter; the manual refers you to the service office.
- Evidence to keep:
- job sheet with each test and its result.
Disconnecting the PV inputs involves high DC voltage and arc risk under load; the AC check involves mains voltage. Qualified installer only.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- GoodWe
- Product type
- Solar inverter
Known code variants
- GoodWe corriente a tierra alta
- GoodWe ground current too high
- GoodWe Ground I Fail
- GoodWe Ground I Failure
- GoodWe inverter Ground I
- inversor GoodWe Ground I
What it means
According to GoodWe, Ground I Failure means the ground current is too high. The inverter has a built-in Residual Current Monitoring Unit (RCMU) that disconnects it from the grid quickly when it detects leakage above the permissible range. The leak can be in the PV generator or in the AC system around the inverter, which is why the manual asks for the PV inputs to be separated and the AC side checked. The code does not say which side the leak is on or which component causes it.
Warnings and stop conditions
- Higheditorial warning
Although the manual mentions unplugging the PV generator inputs, that step is not for you: GoodWe restricts operation and maintenance to qualified professionals.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
Symptoms and causes
Probable causes · in order
- Leak on the PV sidePossible
If the fault clears when the PV generator inputs are disconnected and returns when they are reconnected, the leak is in the strings or their connectors.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
- Leak in the peripheral AC systemPossible
The manual asks for the AC system around the inverter to be checked. Suspect it when leakage persists with the PV inputs disconnected.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
- Fault in the inverter itselfPossible
If the problem persists after the PV and AC sides are checked, GoodWe refers you to the local service office to assess the unit.
Evidence: User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
Virtual technician
Does Ground I Failure still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
User Manual V1.7-2026-08-20 Grid-Tied PV Inverter XS Series 0.7-3.3kW
GoodWe Technologies Co., Ltd. · 2026 · manual
- 2
XS SERIES USER MANUAL Ver2.6 EN
GoodWe Technologies Co., Ltd. · 2022 · manual
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