Solar · Error codes · myenergi
155-W04myenergi · libbi
155-W04 on a myenergi libbi: Solar Loss - PV connected but no generation
Short answer
On a myenergi inverter, 155-W04 means: Solar Loss - PV connected but no generation. The inverter keeps running.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Solar Loss - PV connected but no generation.
Likely causes:
- Night-time, low light, disconnected PV, or libbi with no PV connected.
Is it safe?
| Does the inverter stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The inverter keeps running.
Resetting itself: yes - clears when PV produces.
Manual reset: Reboot libbi controller/inverter per myenergi article.
What you can check
- Not normally a fault (myenergi) - it is expected at night or in very low light, and can show on a libbi with no solar connected. If it shows in bright daylight, note it and tell your installer.
What the engineer will check
- Check PV isolator state, string voltage and connectors if it appears in daylight.
Who to ask for: MCS battery installer / electrician trained on myenergi libbi.
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
- myenergi Help Centre - libbi On Site Troubleshooting (Code 151/W00 to Code 179/W25 articles) ↗ · Help Centre article updated 2025-11-19 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026