pv-isolation-total on a Tesla Powerwall+: Alert: Isolation Self-Test Failure ('PV Isolation Total' or 'PV Isolation 24Hr Lockout') on Powerwall+/Tesla Solar Inverter
Short answer
On a Tesla inverter, pv-isolation-total means: Alert: Isolation Self-Test Failure ('PV Isolation Total' or 'PV Isolation 24Hr Lockout') on Powerwall+/Tesla Solar Inverter. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Alert: Isolation Self-Test Failure ('PV Isolation Total' or 'PV Isolation 24Hr Lockout') on Powerwall+/Tesla Solar Inverter.
Likely causes:
- PV array conductor faulting to earth (damaged module, nicked/pinched cable).
- Strings mixed between inverters.
Is it safe?
Switch the inverter off at its isolator and call an engineer.
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: no.
What you can check
- Read the app; contact installer (DC-side fault - no homeowner action).
What the engineer will check
- IR test each string at 1000 V (>1 MΩ to ground).
- Inspect for pinched wires, water ingress, damaged modules.
Who to ask for: PV / DC fault finding.
Certification: Tesla Certified Installer (Powerwall is not user-serviceable); electrical work to BS 7671.
What you might notice
Sources
- Powerwall 2 / Powerwall+ Troubleshooting Manual - Setup and Install (Tesla One, en-us) ↗ · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026