HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 30 error code
Battery capacity low alarm 1 (BatCapacityLow1): BMS reports SOC below the first low-capacity threshold, 10 percent in the single-phase table and 15 percent in the three-phase table.
Likely causes
- Battery discharged to the low-capacity threshold
- Insufficient PV or grid charging
- BMS protocol not enabled so SOC is unavailable
- Load larger than the daily charge budget
Checks to run, in order
- 1Read SOC from the inverter display and the BMS app
- 2Confirm BMS communication is working
- 3Check PV yield and AC charge settings
- 4Review the load profile against the charge available
Fixes
- Charge the battery above the alarm SOC
- Shift heavy loads to daylight hours
- Confirm the lithium protocol is selected so SOC limits work
When to escalate
If SOC is reported incorrectly against the BMS, the distributor should check the BMS protocol mapping; the threshold itself is a BMS setting, not an inverter fault.
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 30 mean?
Battery capacity low alarm 1 (BatCapacityLow1): BMS reports SOC below the first low-capacity threshold, 10 percent in the single-phase table and 15 percent in the three-phase table.
How do I fix SRNE 30?
Charge the battery above the alarm SOC Shift heavy loads to daylight hours Confirm the lithium protocol is selected so SOC limits work
When should I escalate SRNE 30?
If SOC is reported incorrectly against the BMS, the distributor should check the BMS protocol mapping; the threshold itself is a BMS setting, not an inverter fault.
Can I reset SRNE 30 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 30 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 30?
SRNE 30 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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