HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 02 error code
Battery discharge average current overcurrent, detected by software (BatOverCurrSw); the inverter limits or stops discharge.
Likely causes
- Load current above what the battery bank can deliver continuously
- Battery bank too small for the inverter's discharge current
- Large motor or compressor inrush on the battery
- Unbalanced parallel battery strings sharing current unequally
Checks to run, in order
- 1Clamp the DC current at the battery cable during the trip
- 2Compare it with the inverter continuous rating and the battery datasheet continuous discharge current
- 3Record which loads were running when the fault appeared
- 4Check battery cable size and lug temperature
Fixes
- Reduce the load and restart the inverter
- Add battery capacity or parallel strings so the load is within the continuous rating
- Stagger the start of heavy inductive loads
When to escalate
If overcurrent trips with a small load and a healthy bank, ask the distributor to test the current sensor and discharge control loop.
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 02 mean?
Battery discharge average current overcurrent, detected by software (BatOverCurrSw); the inverter limits or stops discharge.
How do I fix SRNE 02?
Reduce the load and restart the inverter Add battery capacity or parallel strings so the load is within the continuous rating Stagger the start of heavy inductive loads
When should I escalate SRNE 02?
If overcurrent trips with a small load and a healthy bank, ask the distributor to test the current sensor and discharge control loop.
Can I reset SRNE 02 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 02 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 02?
SRNE 02 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 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.
- 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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