What to do if my CPS SCA Inverter displays Protect0090 (Bus over voltage)?
- DDerek DuarteAug 30, 2025
If your CPS Inverter displays a Protect0090 (Bus over voltage) error, try restarting the inverter by turning both the AC and DC switches off, waiting one minute, and then turning them back on to allow all energy to discharge. If the fault continues, the inverter may need to be replaced.