What does 'String X Output Current Anomaly' mean on my Sungrow SG250HX and how to fix it?
To address a 'String X Output Current Anomaly' on your Sungrow Inverter: 1. Check if the corresponding module is covered. If so, remove the cover and ensure the module is clean. 2. Inspect the module for signs of abnormal aging. If the problem continues, contact Sungrow Service.
Why does my Sungrow Inverter show Grid Overvoltage?
Your Sungrow Inverter will automatically reconnect to the grid once the voltage returns to normal levels. If the problem continues: 1. Measure the grid voltage and contact your local utility if it's higher than expected. 2. Check the protection parameters in your APP or on the LCD to ensure they are set correctly. 3. Verify the AC cable's cross-sectional area meets requirements. If the issue persists, contact Sungrow Service.
What to do if my Sungrow SG250HX Inverter displays a 'Low System Insulation Resistance' error?
The Sungrow Inverter should return to normal operation automatically. If the problem persists: 1. Check that the ISO resistance protection value is not set too high in the APP and complies with local regulations. 2. Inspect the string and DC cable for resistance to ground, addressing any shorts or insulation damage. 3. If the error occurs on rainy days, re-check when the weather is dry. 4. Perform a Megger test on the DC cables. If the problem continues, contact Sungrow Service. This issue is often caused by poor insulation of the module/cable or damp conditions.
What to do if my Sungrow SG250HX shows Grid Undervoltage?
Your Sungrow Inverter will automatically reconnect to the grid once the grid voltage returns to normal. If the fault continues: 1. Measure the actual grid voltage, and if it is lower than expected, contact the local utility company. 2. Check the protection parameters via the APP. 3. Ensure the AC cables are firmly connected. If the issue persists, contact Sungrow Service.
What does 'Grid Abnormal' mean on my Sungrow Inverter and how to fix it?
The Sungrow Inverter will automatically reconnect to the grid after the grid returns to normal parameters. However, if this fault continues: 1. Measure the grid frequency and voltage, and contact your local utility company if these parameters exceed set values. 2. If the issue persists, contact Sungrow Service.
What to do if my Sungrow SG250HX Inverter displays 'Grid Over Frequency'?
The Sungrow Inverter will automatically reconnect to the grid once the grid frequency returns to normal. If the fault persists: 1. Measure the actual grid frequency and contact the local utility company if it's beyond the set range. 2. Check whether the protection parameters are appropriately set via the APP. If the problem continues, contact Sungrow Service.
What to do if my Sungrow Inverter is showing a 'Device Anomaly'?
If your Sungrow Inverter displays a 'Device Anomaly', wait for it to return to normal. If it doesn't, disconnect both the AC and DC switches, wait 15 minutes, then reconnect them to restart the inverter. If the fault persists, contact Sungrow Service.
What does 'String X Reverse Connection Alarm' mean on my Sungrow SG250HX Inverter and how to resolve it?
To address a 'String X Reverse Connection Alarm' on your Sungrow Inverter: 1. Check if the corresponding string has reverse polarity. If so, disconnect the DC switch and adjust the polarity when solar radiation is low and the string current drops below 0.5A. If the problem continues, contact Sungrow Service.
What does 'Grid Voltage Unbalance' mean on my Sungrow SG250HX and how can I fix it?
Your Sungrow Inverter will reconnect to the grid once the grid returns to normal. If the fault persists: 1. Measure the actual grid voltage. If the grid phase voltages differ greatly, contact the utility company for solutions. 2. If the voltage difference between the three phases is within the permissible range of the local power company, modify the grid voltage imbalance parameter through the APP. If the issue persists, contact Sungrow Service.
What to do if my Sungrow Inverter displays 'Grid Low Voltage'?
The Sungrow Inverter will reconnect to the grid once the grid voltage returns to normal. If the fault continues: 1. Measure the actual grid voltage and contact the local utility company if the grid voltage is lower than the set value. 2. Check whether the protection parameters are appropriately set via the APP. 3. Check whether the AC cables are firmly in place. If the fault persists, contact Sungrow Service.
General| Max. DC Voltage | 1500 V |
|---|---|
| Rated AC Power | 250 kW |
| Max. Efficiency | 99% |
| Number of MPPTs | 12 |
| Cooling Method | Smart forced air cooling |
| Max. AC Output Power | 275 kVA |
| Rated AC Output Power | 250 kW |
| Rated AC Voltage | 400 V |
| Rated Grid Frequency | 50 Hz / 60 Hz |
| Grid Frequency Range | 45 Hz - 55 Hz / 55 Hz - 65 Hz |
| Power Factor at Rated Power | 1 |
| Adjustable Power Factor Range | 0.8 leading - 0.8 lagging |
| THDI | <3% |
| DC Switch | Yes |
| Protection Degree | IP66 |
| Operating Temperature Range | -25°C to +60°C |
Covers manual validity, intended audience, and usage guidance.
Explains the meaning of warning symbols used throughout the manual for safety.
Covers safety for unpacking, installation, and electrical connections.
Safety guidelines for operation, maintenance, and product disposal.
Describes the inverter's role and provides a general introduction to the product.
Identifies key components, symbols, and LED indicators of the inverter.
Details the inverter's functional features, including DC switch and circuit.
Steps for unpacking, inspecting, and listing package contents.
Guidelines for proper storage of the inverter if not installed immediately.
Safety measures and environmental considerations for inverter mounting.
Lists tools and procedures for mounting, moving, and installing the inverter.
Crucial safety guidelines before performing any electrical connections.
Details terminals, cable types, grounding, and connection overviews.
Procedures for connecting AC/DC cables and communication interfaces.
Checks to perform before initiating the commissioning process.
Step-by-step guide for commissioning the inverter.
Instructions for installing, logging in, and overview of app features.
Guides on configuring parameters, updating firmware, and managing passwords.
Steps to safely disconnect, remove, and dispose of the inverter.
Lists common fault codes and their corrective measures for troubleshooting.
Important notices and steps for performing routine maintenance and cleaning.
Contains detailed technical specifications and parameters of the inverter.
Covers wiring distances, warranty, and contact information.
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