HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 07 error code
Internal DC bus overvoltage detected by hardware protection (BusOverVoltHw); the inverter stops the output.
Likely causes
- Internal bus capacitor or sensing hardware fault
- Large grid surge or lightning transient on the AC input
- Battery regen energy with no load to absorb it
Checks to run, in order
- 1Power the unit off and on once to see whether the fault clears
- 2Check the AC input voltage and look for signs of surge damage
- 3Measure battery voltage
- 4Inspect for discoloration or a burnt smell
Fixes
- Restart once after confirming the grid and battery are normal
- Fit surge protection on the AC input if the site is exposed
When to escalate
Do not keep restarting: a hardware bus overvoltage fault is an internal failure and the unit should be taken out of service and referred to SRNE after-sales.
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 07 mean?
Internal DC bus overvoltage detected by hardware protection (BusOverVoltHw); the inverter stops the output.
How do I fix SRNE 07?
Restart once after confirming the grid and battery are normal Fit surge protection on the AC input if the site is exposed
When should I escalate SRNE 07?
Do not keep restarting: a hardware bus overvoltage fault is an internal failure and the unit should be taken out of service and referred to SRNE after-sales.
Can I reset SRNE 07 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 07 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 07?
SRNE 07 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 06Charging overvoltage protection (BatOverVolt): battery voltage rose above the over-voltage cut-off and charging was stopped.
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.
Back to troubleshooting