HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 06 error code
Charging overvoltage protection (BatOverVolt): battery voltage rose above the over-voltage cut-off and charging was stopped.
Likely causes
- Battery already full and still being charged
- Wrong battery type or charge-voltage profile selected
- BMS communication lost so the inverter fell back to default voltages
- High PV or grid charge current on a small bank
Checks to run, in order
- 1Measure battery voltage at the terminals and compare it with the battery datasheet
- 2Check the selected battery type and the bulk/float/equalise voltages
- 3Confirm BMS communication is alive and the protocol is correct
- 4Check whether the alarm follows a full charge
Fixes
- Stop charging and discharge until the voltage is below the over-voltage recovery point
- Set the correct battery type and charge voltages
- Restore BMS communication so the inverter follows BMS limits
- Restart and observe one full charge cycle
When to escalate
If the measured voltage is normal but the fault returns, have the distributor check the voltage sensing and charge control circuit.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does SRNE 06 mean?
Charging overvoltage protection (BatOverVolt): battery voltage rose above the over-voltage cut-off and charging was stopped.
How do I fix SRNE 06?
Stop charging and discharge until the voltage is below the over-voltage recovery point Set the correct battery type and charge voltages Restore BMS communication so the inverter follows BMS limits Restart and observe one full charge cycle
When should I escalate SRNE 06?
If the measured voltage is normal but the fault returns, have the distributor check the voltage sensing and charge control circuit.
Can I reset SRNE 06 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 06 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 06?
SRNE 06 is documented for HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW). Confirm the code on your own unit's display or manual before ordering parts.
More SRNE error codes
- SRNE 01Battery undervoltage alarm: the battery voltage has fallen below the [Batt. Under volt. alarm] value under Battery Setup, and the alarm does not by itself stop the output.
- SRNE 02Battery discharge average current overcurrent, detected by software (BatOverCurrSw); the inverter limits or stops discharge.
- SRNE 03Battery not connected (BatOpen): the inverter cannot see a battery on the DC side and stops the output.
- SRNE 04Battery undervoltage stop-discharge (BatLowEod): the battery has reached the low-voltage cut-off and the inverter has stopped discharging.
- SRNE 05Battery overcurrent detected by hardware protection (BatOverCurrHw); the inverter shuts the output down.
- SRNE 07Internal DC bus overvoltage detected by hardware protection (BusOverVoltHw); the inverter stops the output.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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