100027 on an AlphaESS battery: Battery_lose - battery not detected
Short answer
On an AlphaESS battery, 100027 means: Battery_lose - battery not detected. The battery keeps running with some functions stopped. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 24 September 2026 · 2 sources
What it means
On the SMILE-G3
The manual says: Battery_lose - battery not detected.
Likely causes:
- Battery wiring abnormal or battery voltage sampling value below 75 V.
On the SMILE-G3 three-phase (T4/T5/T6/T8/T10)
The manual says: Battery_lose (three-phase).
Likely causes:
- Battery comms cable abnormal or battery voltage sample below 75 V.
Is it safe?
On the SMILE-G3
| Does the battery stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The battery keeps running with some functions stopped.
Resetting itself: clears when battery detected.
Manual reset: Restart of the inverter by installer (power-down/power-up sequence) if it does not clear.
On the SMILE-G3 three-phase (T4/T5/T6/T8/T10)
| Does the battery stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The battery keeps running with some functions stopped.
Resetting itself: when battery detected.
Manual reset: Restart of the inverter by installer (power-down/power-up sequence) if it does not clear.
What you can check
On the SMILE-G3
- Read the code in the AlphaCloud app/web portal (or the LED pattern on the unit) and note it with the time. Check the inverter's AC isolator and the consumer-unit breaker for the inverter are ON. Report persistent or repeating codes to your installer - AlphaESS says 'call the service' if it does not clear. If the battery has a visible power indicator and it is off, report this to your installer rather than opening any cover.
On the SMILE-G3 three-phase (T4/T5/T6/T8/T10)
- Read the code in the AlphaCloud app/web portal (or the LED pattern on the unit) and note it with the time. Check the inverter's AC isolator and the consumer-unit breaker for the inverter are ON. Report persistent or repeating codes to your installer - AlphaESS says 'call the service' if it does not clear.
What the engineer will check
On the SMILE-G3
- Check battery power and BMS communication cables, battery breaker and power button status; measure battery voltage at inverter.
Who to ask for: MCS PV/battery installer familiar with AlphaESS.
Certification: MCS battery installer (MIS 3012) or competent electrician trained on the product; IET Code of Practice for Electrical Energy Storage Systems.
On the SMILE-G3 three-phase (T4/T5/T6/T8/T10)
- Check battery comms cable and voltage.
Who to ask for: MCS PV/battery installer familiar with AlphaESS.
Certification: MCS battery installer (MIS 3012) or competent electrician trained on the product; IET Code of Practice for Electrical Energy Storage Systems.
What you might notice
Sources
- Installation, Operation & Maintenance Manual of SMILE-G3-S3.6/S5/B5 (V01, 14.08.2023) ↗ · V01 · page p.83 (printed) · Reviewed 24 September 2026
- Installation, Operation & Maintenance Manual of SMILE-G3-T4/T5/T6/T8/T10 (LED version, V04, 2024) ↗ · V04 · page p.125 (printed) · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026