HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 49 error code
Grid over-voltage: grid voltage is above the upper limit of the selected grid standard, so the inverter disconnects from the grid.
Likely causes
- High grid voltage, common near a distribution transformer
- Grid standard selected does not match the local supply
- Loose or high-resistance neutral causing voltage rise
- Voltage rise from a large PV or generator feed on the same point
Checks to run, in order
- 1Log the L-N voltage at the inverter AC input over a day
- 2Compare the readings with the limits of the selected grid standard
- 3Check neutral and earth connections
- 4Check voltage at the main board as well as at the inverter
Fixes
- Wait for the grid voltage to return to normal
- Correct loose neutral or earth connections
- Set the correct grid standard for the site
When to escalate
Persistent over-voltage at the terminals is a supply problem; if the measured voltage is normal but the inverter still reports it, the distributor should check the voltage sensing 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 49 mean?
Grid over-voltage: grid voltage is above the upper limit of the selected grid standard, so the inverter disconnects from the grid.
How do I fix SRNE 49?
Wait for the grid voltage to return to normal Correct loose neutral or earth connections Set the correct grid standard for the site
When should I escalate SRNE 49?
Persistent over-voltage at the terminals is a supply problem; if the measured voltage is normal but the inverter still reports it, the distributor should check the voltage sensing circuit.
Can I reset SRNE 49 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 49 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 49?
SRNE 49 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.
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