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The complete Sungrow fault reference — string, SH hybrid and battery families — with every alarm number searchable and grouped by root cause.
A reference compiled by Solar Analytica from publicly available Sungrow inverter documentation. It covers Sungrow string inverters, SH residential-hybrid inverters, and battery / BDC fault and alarm codes. Codes that share a single cause and remedy are grouped — every individual code number is still listed and searchable. Safety note: several Sungrow remedies involve disconnecting AC and DC switches and waiting before re-energising — anything involving wiring or opening the unit is licensed-electrician work; if in doubt, contact your installer.
175 of 175 codes
The grid voltage exceeds the protective value.
What to do
Check the grid voltage. If it exceeds the permissible range, contact the utility company; otherwise contact Sungrow or your solar installer.
The grid transient voltage exceeds the inverter's allowable upper limit.
What to do
Wait a moment for the inverter to recover. If the fault persists, contact Sungrow or your solar installer.
The grid voltage is below the protective value.
What to do
Check the grid voltage. If it is outside the permissible range, contact the utility company; otherwise contact Sungrow or your solar installer.
The grid voltage is below the protective value — lower than the threshold for code 004.
What to do
This is a short-term fault due to grid conditions. Wait a moment for the inverter to recover. If the fault persists, contact Sungrow or your solar installer.
The AC output current exceeds the inverter's allowable upper limit.
What to do
The inverter resumes once the output current falls below the protection value. If the fault persists, contact Sungrow or your solar installer.
A transient AC over-current was detected.
What to do
The inverter self-recovers after a few seconds. If the fault persists, contact Sungrow or your solar installer.
The grid frequency exceeds the protective value.
What to do
Check the grid frequency. If it exceeds the permissible range, contact the utility company; otherwise contact Sungrow or your solar installer.
The grid frequency is below the protective value.
What to do
Check the grid frequency. If it is outside the permissible range, contact the utility company; otherwise contact Sungrow or your solar installer.
A grid failure or islanding condition was detected.
What to do
Check the AC circuit breaker status, AC cable connections, and grid service status. If all are OK, contact Sungrow or your solar installer.
The DC current injected into the AC output exceeds the upper limit.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The leakage current exceeds the inverter's allowable upper limit.
What to do
Check the PV strings for ground faults. If the fault repeats, contact Sungrow or your solar installer.
The grid voltage or frequency is outside the permissible range, so the inverter cannot connect to the grid.
What to do
The inverter generally reconnects after the grid recovers. If it occurs frequently, measure the grid parameters and contact the utility company or Sungrow.
The average grid voltage over 10 minutes exceeds the permissible range.
What to do
Verify the country code, check the grid voltage against the permissible range, and contact the utility company if needed.
The grid voltage exceeds the protective value — higher than the threshold for code 002.
What to do
Check the AC cable model and verify the grid voltage. Contact the utility company if needed, or Sungrow.
The bus voltage or power is high.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
Unbalanced three-phase grid voltage was detected.
What to do
Measure the grid voltage; if it is unbalanced, contact the utility company. If it is within range, you can modify the parameter settings via the app.
The transient bus voltage exceeds the inverter's allowable upper limit.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The bus voltage exceeds the inverter's allowable upper limit.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The PV1 input over-current limit was exceeded.
What to do
Check the PV1 input layout and wiring. Contact your solar installer.
The PV2 input over-current limit was exceeded.
What to do
Check the PV2 input layout and wiring. Contact your solar installer.
The deviation of the neutral point voltage exceeds the allowable limit.
What to do
The inverter recovers once the deviation falls below the protective limit. Wait a moment for recovery or restart the system. If the fault persists, contact your solar installer.
An internal device abnormality was detected. (Sungrow groups these codes under a single remedy.)
What to do
Wait for the inverter to recover. Disconnect the AC and DC switches or circuit breakers, then reconnect them after 15 minutes. If the alarm persists, contact Sungrow or your solar installer.
PV1 is connected with reversed polarity.
What to do
Check the PV1 cable connections. Contact your solar installer.
PV2 is connected with reversed polarity.
What to do
Check the PV2 cable connections. Contact your solar installer.
The radiator (heat sink) temperature is too high.
What to do
Check the ambient temperature, ensure adequate ventilation space, avoid direct sunlight, verify the fan operates, and clean the air inlets.
The internal temperature of the inverter is too high.
What to do
Check the ambient temperature, ensure adequate ventilation space, avoid direct sunlight, verify the fan operates, and clean the air inlets.
A relay fault on the grid side was detected.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The insulation resistance of the PV array to earth is low.
What to do
Check the inverter grounding line and verify there are no PV string short-circuits to ground. Contact your solar installer if it persists.
The leakage-current sampling circuit faulted.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The ambient temperature inside the inverter is too low.
What to do
The inverter recovers once the ambient temperature rises above −25 °C.
The inverter self-test failed.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
A fault was detected in the PV1 boost circuit.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
A fault was detected in the PV2 boost circuit.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The PV inputs order is incorrect.
What to do
Stop and disconnect the inverter. Contact your solar installer to reset the PV inputs order.
The phase-current sampling circuit faulted.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The load power exceeds the limit in off-grid mode.
What to do
If it persists, contact your installer and disconnect non-essential loads.
Inverter under-voltage fault in off-grid mode.
What to do
Wait 5 minutes for recovery, or restart the system.
The slave DSP detected that the grid voltage exceeds the inverter's allowable upper limit.
What to do
Check the grid voltage. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
The slave DSP detected that the grid frequency exceeds the inverter's allowable upper limit.
What to do
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
The slave DSP detected that the leakage current exceeds the inverter's allowable upper limit.
What to do
Check for PV string ground faults. Contact Sungrow or your solar installer if it repeats.
A communication alarm between the master and slave DSP.
What to do
Wait 1 minute for the inverter to recover. If the fault persists, contact Sungrow or your solar installer.
No inverter model has been set.
What to do
Contact Sungrow or your solar installer.
A DI fault of the STB5K backup box.
What to do
Check the DI connection between the inverter and the backup box. Wait 5 minutes for recovery.
The version of the CPLD (complex programmable logic device) cannot be detected.
What to do
Power off the system and program the CPLD.
Inverter over-voltage fault in off-grid mode.
What to do
Wait 5 minutes for recovery, or restart the system.
Inverter under-frequency fault in off-grid mode (default value 47 Hz).
What to do
Wait 5 minutes for recovery, or restart the system.
Inverter over-frequency fault in off-grid mode (default value 52 Hz).
What to do
Wait 5 minutes for recovery, or restart the system.
A temporary grid over-voltage in off-grid mode.
What to do
Wait 5 minutes for recovery, or restart the system.
The fans are defective (−D series only).
What to do
Stop the inverter and disconnect the cables. Check for a blocked fan duct, and replace the fans if necessary.
An AC surge protection device (SPD) alarm.
What to do
Check the SPD and replace it if necessary. Contact Sungrow or your solar installer.
A DC surge protection device (SPD) alarm.
What to do
Check the SPD and replace it if necessary. Contact Sungrow or your solar installer.
An RS485 communication error between two inverters in parallel.
What to do
Check the RS485 cable connection and the parallel settings in the LCD menu. Contact Sungrow or your solar installer.
A PV string is abnormal.
What to do
Check whether the string needs to be connected, verify a reliable connection, and check the DC fuse status. Contact your installer if it persists.
Fan 2 is running at an abnormal speed.
What to do
Check whether the fan is blocked. Restart the system.
The Energy Meter cable connection is reversed.
What to do
Check the power-cable polarity, verify the “Existing Inverter” setting, and check the CT clamp placement for a single-phase sensor.
The software versions do not match.
What to do
Contact Sungrow.
The arc-fault detection (AFCI) module is abnormal.
What to do
The inverter can operate normally. Check whether the related cable connections and terminals are abnormal, and whether the ambient environment is abnormal; take corrective measures if so. If the alarm persists, contact Sungrow or your solar installer.
A DC arc fault was detected.
What to do
Disconnect the DC inputs and check the cables for damage, the terminal connections, the fuses, and for burnt modules. Reconnect and clear the alarm via the app. Contact your installer if it persists.
The AFCI function is disabled.
What to do
Enable the AFCI function via the app and the inverter will recover. If the alarm persists, contact Sungrow or your solar installer.
The AC output current exceeds the upper limit.
What to do
The inverter resumes once the output current falls below the protection value. If the fault persists, contact Sungrow or your solar installer.
The grid frequency exceeds the protective value — higher than the threshold for code 008.
What to do
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
The grid frequency is below the protective value — lower than the threshold for code 009.
What to do
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
The SPI auto-test failed (Italy only).
What to do
Restart the system and re-run the auto-test if necessary. If the fault persists, contact Sungrow for a solution.
Neither the PE terminal on the AC connection block nor the second PE terminal on the enclosure is reliably connected.
What to do
Check the inverter grounding line and the ground access. Contact Sungrow or your solar installer if it persists.
The DC injection of the inverter voltage exceeds the upper limit, in off-grid mode.
What to do
The inverter recovers once the DC injection voltage falls below the recovery value.
A temporary over-current on the bypass path.
What to do
Check the BACKUP-port load power against the upper limit. Wait for recovery or restart. Contact Sungrow if it persists.
The bus voltage exceeds the hardware protective value.
What to do
Wait for the inverter to recover once the bus voltage drops. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The bus voltage is too low.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
The PV1 or PV2 current exceeds the hardware protective value.
What to do
Contact Sungrow or your solar installer if it repeats.
The PV input voltage exceeds the bus voltage.
What to do
Check the PV connection terminal functionality. Contact your solar installer.
A short-circuit fault in the PV1 boost stage.
What to do
The inverter may be damaged. Contact Sungrow for a solution.
A short-circuit fault in the PV2 boost stage.
What to do
The inverter may be damaged. Contact Sungrow for a solution.
Inverter over-temperature fault.
What to do
Check and clean the heat sink, verify the inverter is not in direct sunlight and the ambient temperature is below 45–60 °C, then restart.
Low PV insulation resistance.
What to do
Check the PV cable connection integrity. Wait for a sunny day to test. Contact your installer if it persists.
A fault in the bypass relay.
What to do
Wait 5 minutes for the inverter to recover, or restart the system. If the error persists, contact Sungrow or your solar installer.
A fault in the off-grid relay.
What to do
Wait 5 minutes for the inverter to recover, or restart the system. If the error persists, contact Sungrow or your solar installer.
The input and output power do not match.
What to do
Contact Sungrow or your solar installer if it repeats.
A redundancy fault on the slave DSP.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
The phase-voltage sampling circuit faulted.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
The DC-injection sampling circuit faulted.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
The PV1 current-sampling channel is anomalous.
What to do
Contact Sungrow or your solar installer.
The PV2 current-sampling channel is anomalous.
What to do
Contact Sungrow or your solar installer.
The PV1 MPPT current-sampling circuit faulted.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
The PV2 MPPT current-sampling circuit faulted.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
A failure of the system power supply.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
A fault in the leakage-current sensor.
What to do
Contact Sungrow or your solar installer.
Communication faults between the master DSP and the slave DSP.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
A communication fault on the master DSP.
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
A permanent fault was recorded. (Sungrow groups these codes under a single remedy.)
What to do
Restart the system. Contact Sungrow or your solar installer if it persists.
All temperature sensors have failed.
What to do
Contact Sungrow or your solar installer if it repeats.
An external-memory read/write warning (FRAM1).
What to do
The inverter can still connect to the grid. Restart the system. If the fault persists, contact Sungrow or your solar installer.
Ambient temperature sensor open-circuit warning.
What to do
Contact Sungrow or your solar installer if it repeats.
Ambient temperature sensor short-circuit warning.
What to do
Contact Sungrow or your solar installer if it repeats.
Radiator temperature sensor open-circuit warning.
What to do
Contact Sungrow or your solar installer if it repeats.
Radiator temperature sensor short-circuit warning.
What to do
Contact Sungrow or your solar installer if it repeats.
An error in the DO (digital output) power settings.
What to do
Modify the DO control power according to the load power. See “Optimised Control” in the user manual.
The clock has been reset.
What to do
Manually reset the clock, or synchronise with network time, to clear the fault.
The PV voltage exceeds the permissible range.
What to do
Contact your installer to verify the PV array configuration is within the permissible range. Wait for recovery or restart.
Ambient temperature sensor open-circuit warning.
What to do
Contact Sungrow or your solar installer if it repeats.
Fan 1 is running at an abnormal speed.
What to do
Check whether the fan is blocked. Restart the system.
Abnormal Energy Meter communication (the inverter can still connect to the grid).
What to do
Check the meter power-cable connections and the RS485 connection. Contact your installer if it persists.
A PV string is connected with reversed polarity.
What to do
Check the string polarity; adjust only when solar radiation is low and the string current is below 0.5 A. Contact Sungrow if it persists.
A PV string current is abnormal.
What to do
Check for shaded PV modules; remove shade and clean them. Check for abnormal module aging. Contact Sungrow if it persists.
The leakage-current sampling circuit faulted.
What to do
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
A temporary over-current during battery (BDC) charging.
What to do
Wait for the system to recover, or restart.
A temporary over-current during battery (BDC) discharging.
What to do
Wait for the system to recover, or restart.
The clamping-capacitor voltage is too low.
What to do
Check the battery cable connection. Wait for recovery or restart.
A temporary clamping-capacitor over-voltage.
What to do
Wait for the system to recover, or restart.
The battery (BDC) circuit self-check failed.
What to do
Wait for the system to recover, or restart.
The battery (BDC) stage is over temperature.
What to do
Check and clean the heat sink, verify the location is not in sunlight and the ambient temperature is below 45 °C, then restart.
The battery (BDC) hardware over-current limit was exceeded.
What to do
The system resumes once the battery charge/discharge current falls below the upper limit, or restart the system.
The battery (BDC) current-sampling circuit faulted.
What to do
Wait for the system to recover, or restart.
A slave DSP communication fault.
What to do
Wait for the system to recover, or restart.
The battery (BDC) soft-start failed.
What to do
Wait for the system to recover, or restart.
The average battery voltage is too low.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
The battery is over temperature.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
The battery is under temperature.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
An instantaneous battery over-voltage.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
The average battery voltage is too high.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
Abnormal communication between the battery and the hybrid inverter.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery type and communication connection; set the battery type for lead-acid if applicable. Restart if needed.
The battery hardware over-voltage limit was exceeded.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
Battery over-voltage protection has triggered.
What to do
The inverter stays grid-connected. Charging has stopped but discharging is allowed. Wait a moment for recovery.
Battery over-temperature protection has triggered.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
Battery under-temperature protection has triggered.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
Battery charging/discharging over-current protection has triggered.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
Battery under-voltage protection has triggered.
What to do
The inverter stays grid-connected. Discharging has stopped but charging is allowed. Wait a moment for recovery.
An internal permanent fault in the battery (BDC) stage. (Sungrow groups these codes under a single remedy.)
What to do
Restart the system. Contact Sungrow if it persists.
A battery FET fault or electrical switch failure.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
A battery charging/discharging over-current permanent fault.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
An ID-competing failure.
What to do
Restart the system. Contact Sungrow if it persists.
The software versions do not match.
What to do
Contact Sungrow for a solution.
The software self-verification failed.
What to do
Restart the system. Contact Sungrow if it persists.
A battery cell over-voltage fault.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
A battery pre-charge voltage fault.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
A battery under-voltage fault.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
A battery cell voltage imbalance fault.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
A battery cable connection fault.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
A battery (BDC) temperature-sensor warning. (Sungrow groups these codes under a single remedy.)
What to do
Check and clean the heat sink, verify the location is not in sunlight and the ambient temperature is below 45 °C, then restart.
The transformer direction was recognised incorrectly.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
The battery's State of Health is low.
What to do
The inverter stays grid-connected and charge/discharge is normal. The battery is beyond the scope of the warranty — it is recommended to contact the distributor for replacement.
A FRAM2 memory warning.
What to do
Restart the inverter.
A battery over-voltage warning.
What to do
The inverter stays grid-connected. Charging has stopped but discharging is allowed. The system resumes after some discharging.
A battery over-temperature warning.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
A battery under-temperature warning.
What to do
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
A battery charging/discharging over-current warning.
What to do
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
A battery tray voltage imbalance warning.
What to do
The inverter stays grid-connected and charge/discharge is normal. Check whether the battery cable connection is correct.
A battery under-voltage warning.
What to do
The inverter stays grid-connected. Discharging has stopped but charging is allowed. The system resumes after some charging.
An internal battery warning.
What to do
Consult the battery manufacturer for a solution.
SH hybrid series: grid over-voltage.
What to do
The inverter reconnects after the grid recovers. If frequent, measure the grid voltage and contact the utility company or Sungrow. Verify the protection parameters and AC cable cross-section.
SH hybrid series: grid under-voltage.
What to do
Generally reconnects after the grid recovers. If frequent, measure the grid voltage and contact the utility company. Verify the protection parameters and AC cable connections.
SH hybrid series: grid over-frequency.
What to do
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Verify the protection parameters.
SH hybrid series: grid under-frequency.
What to do
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Verify the protection parameters.
SH hybrid series: no grid detected.
What to do
Check the grid power supply reliability, AC cable connections, live/neutral wire placement, and AC switch status. Contact Sungrow or your solar installer if it persists.
SH hybrid series: leakage current too high.
What to do
Can be caused by poor sunlight or a damp environment — the inverter reconnects after conditions improve. If the environment is normal, check that the AC and DC cables are well insulated. If the alarm persists, contact Sungrow or your solar installer.
SH hybrid series: grid abnormal.
What to do
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Contact Sungrow or your solar installer if it persists.
SH hybrid series: unbalanced grid voltage.
What to do
Generally reconnects after recovery. If frequent, measure the grid voltage; if unbalanced, contact the utility company. Modify the settings via the app if within the permissible range.
SH hybrid series: PV reverse connection fault.
What to do
Check the string polarity; adjust only when solar radiation is low and string current is below 0.5 A. Verify that strings on the same MPPT have the same module count. Contact Sungrow if it persists.
SH hybrid series: PV reverse connection alarm.
What to do
Check the string polarity; adjust only when solar radiation is low and string current is below 0.5 A. Verify that strings on the same MPPT have the same module count. Contact Sungrow if it persists.
SH hybrid series: PV abnormal alarm.
What to do
Check for shaded PV modules; remove shade and clean them. Check for abnormal module aging. Contact Sungrow or your solar installer if it persists.
SH hybrid series: high ambient temperature.
What to do
Avoid direct sunlight; clean the air ducts; check for a fan alarm via the app and replace the fan if needed. Contact Sungrow or your solar installer if it persists.
SH hybrid series: low ambient temperature.
What to do
Stop and disconnect the inverter. Restart it when the ambient temperature is within the permissible range.
SH hybrid series: low insulation (ISO) resistance.
What to do
Wait for recovery. Verify the protection value via the app complies with regulations. Check the PV cable insulation. Clear any water/vegetation on site. Contact Sungrow if it persists.
SH hybrid series: grounding cable fault.
What to do
Check the AC cable connections. Verify the grounding-cable wire-core insulation. Contact Sungrow or your solar installer if it persists.
SH hybrid series: DC arc fault.
What to do
Disconnect the DC inputs and check the cables for damage, terminal connections, fuses, and burnt modules. Reconnect and clear via the app. Contact your installer if it persists.
SH hybrid series: off-grid load over-power.
What to do
Reduce the power of loads connected at the off-grid port, or remove some loads. If the alarm persists, contact Sungrow or your solar installer.
SH hybrid series: Smart Energy Meter connected in reverse.
What to do
Check the meter polarity against the cable-port markings and correct it if needed. Verify the meter is connected at the grid connection point. Contact Sungrow or your solar installer if it persists.
SH hybrid series: Smart Energy Meter communication error.
What to do
Check the meter communication cable and terminals for abnormality, and reconnect the communication cable. Contact Sungrow or your solar installer if it persists.
SH hybrid series: grid confrontation.
What to do
Check whether the AC output port is connected to the actual grid; if so, disconnect it. If the alarm persists, contact Sungrow or your solar installer.
SH hybrid series: parallel communication alarm.
What to do
Check the communication cable and terminal connections for abnormality, and reinstall the communication cable. Contact Sungrow or your solar installer if it persists.
SH hybrid series: battery management system (BMS) communication error.
What to do
Check the communication cable and terminal connections for abnormality, and reinstall the communication cable. Contact Sungrow or your solar installer if it persists.
SH hybrid series: battery polarity reversed.
What to do
Check the battery polarity is correct and correct it if necessary. If the alarm persists, contact Sungrow or your solar installer.
SH hybrid series: battery alarm.
What to do
The battery generally recovers automatically. If persistent, address ambient-temperature issues or contact the battery manufacturer.
SH hybrid series: battery abnormal.
What to do
If the voltage is abnormal, check the battery's real-time voltage and contact the manufacturer or Sungrow. For temperature issues, improve heat dissipation. Contact the manufacturer if it persists.
SH hybrid series: system alarm.
What to do
The inverter can operate normally. Check whether the related cable connections and terminals are abnormal, and whether the ambient environment is abnormal; take corrective measures if so. If the alarm persists, contact Sungrow or your solar installer.
SH hybrid series: system fault.
What to do
Wait for the inverter to recover. Disconnect the AC and DC switches or circuit breakers, then reconnect them after 15 minutes. If the alarm persists, contact Sungrow or your solar installer.
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