HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 04 error code
Battery undervoltage stop-discharge (BatLowEod): the battery has reached the low-voltage cut-off and the inverter has stopped discharging.
Likely causes
- Battery at end of discharge after a long grid outage
- Low-voltage cut-off set above the battery's real capability
- Bank not recharged since the last outage
- Heavy load pulling the voltage below cut-off
Checks to run, in order
- 1Measure battery voltage and read SOC from the BMS
- 2Compare with the [Batt. voltage low fault] and recovery values
- 3Confirm the battery was charging before the trip
- 4Check cable voltage drop under load
Fixes
- Charge the battery above the low-voltage recovery value, then restart
- Reduce the load or deepen the discharge reserve
- Correct the cut-off setting to match the battery datasheet
When to escalate
If end-of-discharge repeats immediately after a full charge, arrange a battery capacity test with the distributor before changing settings.
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 04 mean?
Battery undervoltage stop-discharge (BatLowEod): the battery has reached the low-voltage cut-off and the inverter has stopped discharging.
How do I fix SRNE 04?
Charge the battery above the low-voltage recovery value, then restart Reduce the load or deepen the discharge reserve Correct the cut-off setting to match the battery datasheet
When should I escalate SRNE 04?
If end-of-discharge repeats immediately after a full charge, arrange a battery capacity test with the distributor before changing settings.
Can I reset SRNE 04 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 04 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 04?
SRNE 04 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 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.
- 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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