Huawei Error 2035: Grid Overfrequency Troubleshooting Guide
Huawei Error 2035 (Grid Overfrequency) indicates that the inverter has detected a grid frequency higher than the permitted operating range and has disconnected from the utility grid for protection and compliance reasons.
This is a grid-related protection event and does not usually indicate an internal inverter failure.
What Is Grid Overfrequency?
Grid frequency represents the balance between electricity generation and consumption within the power network.
In most European countries, the nominal grid frequency is:
- 50 Hz
Huawei SUN2000 inverters continuously monitor grid frequency and must disconnect if the frequency exceeds the limits defined by local grid codes.
When the frequency becomes too high, the inverter displays Error 2035 – Grid Overfrequency and stops exporting power.
Common Symptoms of Huawei Error 2035
When this alarm occurs, you may notice:
- Inverter stops producing power
- Solar generation suddenly drops to zero
- Grid Overfrequency alarm appears
- FusionSolar displays a grid fault warning
- Frequent inverter reconnection attempts
- Production resumes automatically after some time
In many cases, the inverter reconnects automatically once grid frequency returns to normal.
Why Huawei Error 2035 Happens
1. Utility Grid Frequency Too High
The most common cause is a temporary increase in utility grid frequency.
This can occur when:
- Electricity generation exceeds demand
- Large industrial loads disconnect suddenly
- Grid balancing events occur
- Utility switching operations take place
Typical frequency limits depend on local regulations and inverter settings.
Example:
- Nominal frequency: 50 Hz
- Normal operating range: approximately 49.5–50.5 Hz
- Protection threshold: typically around 51–52 Hz
Values vary depending on country code and grid standard.
2.Incorrect Grid Code Configuration
Huawei inverters use country-specific grid profiles.
If the wrong grid code is selected:
- Frequency protection limits may be incorrect
- The inverter may disconnect unnecessarily
- Grid alarms may occur even when the utility frequency is acceptable
3. Frequency Measurement Errors
Although less common, incorrect measurements can occur because of:
- Wiring problems
- Loose AC connections
- Voltage quality disturbances
- Electrical noise
These issues may cause the inverter to detect abnormal frequency values.
4. Utility Grid Disturbances
Temporary events within the distribution network can trigger frequency excursions:
- Grid switching operations
- Generator synchronization events
- Transmission faults
- Regional grid instability
These events are usually short in duration.
How to Diagnose Huawei Error 2035
Step 1 – Check When the Alarm Occurs
Ask the following questions:
- Does the alarm occur at the same time every day?
- Does it happen only occasionally?
- Are nearby installations experiencing similar issues?
Patterns often help identify utility-related problems.
Step 2 – Review FusionSolar Event Logs
Check:
- Alarm timestamps
- Alarm frequency
- Reconnection behavior
Repeated occurrences may indicate a persistent grid condition.
Step 3 – Measure Grid Frequency
Using a calibrated power quality meter, verify:
- Frequency at the main distribution board
- Frequency at inverter terminals
Normal European grid frequency should remain close to 50 Hz.
Step 4 – Verify Grid Code Settings
Confirm:
- Country selection
- Grid standard configuration
- Utility requirements
Incorrect settings can trigger unnecessary frequency alarms.
Typical Frequency Limits
Reference values vary by country and utility requirements.
Typical examples:
| Parameter | Value |
|---|---|
| Nominal Frequency | 50 Hz |
| Normal Operating Range | 49.5–50.5 Hz |
| Overfrequency Protection | ~51–52 Hz |
| Underfrequency Protection | ~47.5–49 Hz |
Always verify the applicable limits for the installed grid code.
Real-World Example
A commercial PV system experienced repeated Huawei Error 2035 alarms during periods of low electricity demand.
Investigation showed that local grid frequency occasionally exceeded the configured protection threshold because of generation-load imbalance within the distribution network.
No inverter fault was found.
After coordination with the utility provider, the frequency excursions were confirmed and the system continued operating normally when grid conditions stabilized.
Huawei Error 2035 vs Huawei Error 2032
These alarms are often confused.
Huawei Error 2035
- Frequency too high
- Grid remains present
- Frequency exceeds limits
Huawei Error 2032
- General grid abnormal condition
- May involve voltage, frequency, or grid instability
- Broader protection category
Accurate diagnosis requires reviewing event logs and electrical measurements.
Prevention Tips
To reduce frequency-related alarms:
- Verify correct grid code configuration
- Inspect AC wiring and connections
- Maintain firmware compatibility
- Monitor grid quality periodically
- Investigate repeated frequency events
Frequently Asked Questions
What does Huawei Error 2035 mean?
Huawei Error 2035 indicates that grid frequency has exceeded the allowed operating limit and the inverter has disconnected from the utility network.
Is Huawei Error 2035 dangerous?
No. It is a protective shutdown designed to comply with grid regulations and protect system stability.
Can Error 2035 damage the inverter?
No. The inverter disconnects specifically to prevent unsafe operation.
Will the inverter reconnect automatically?
Yes. In most cases, the inverter automatically reconnects once grid frequency returns to an acceptable range.
Is Error 2035 caused by the inverter?
Usually not. Most cases are related to utility grid conditions, configuration issues, or temporary network disturbances.
Related Huawei Troubleshooting Guides
👉 Huawei SUN2000 Error Code Index
Conclusion
Huawei Error 2035 (Grid Overfrequency) occurs when the inverter detects a grid frequency above the permitted operating range.
Most cases are caused by utility grid conditions, incorrect grid settings, or temporary network disturbances rather than inverter hardware faults.
Proper diagnosis should focus on frequency measurements, event log analysis, and verification of the configured grid code before assuming equipment failure.
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