Step-by-Step: How to Reset Your Solar System After an RCCB or MCB Trip

Before You Reset: A Quick Safety Check

After your solar system's RCCB or MCB trips, take 30 seconds to run through these checks before touching anything:

1. Is it currently raining or have panels just been wet? If yes, wait 15–30 minutes after rain stops before resetting.
2. Do you smell burning or see smoke? Do not touch anything — call Sunollo immediately.
3. Has the same breaker tripped more than twice today? Do not keep resetting — contact Sunollo for an inspection.
4. Is the trip on the solar circuit, or has your whole home lost power? If your whole home is without power, this may be an SP Group grid outage — check the SP Power Alert app or call 1800 778 8888.

Locating Your Solar Circuit Breakers

Your solar system has breakers in two locations:

• Main household switchboard (usually in a utility cupboard or near the main door) — this contains the RCCB and AC MCB for your solar system. These are typically labelled "Solar PV" or "Solar".
• Inverter isolator switch — usually a small grey or red switch mounted on the wall next to your inverter. This is the AC isolator.
• DC isolator switch — mounted on or near the inverter, this isolates the DC cables coming from your roof panels. It may be red or black.

Tip: Take a photo of your switchboard now and label each breaker on your phone for easy reference. Sunollo will have labelled them during commissioning.

The Correct Reset Sequence

Follow this sequence carefully — the order matters:

Step 1: Turn Off the Inverter Safely First

1. Locate the AC isolator switch next to the inverter and turn it to OFF.
2. Locate the DC isolator switch on the inverter (usually labelled "PV" or "DC Input") and turn it to OFF. Note: DC cables from your panels are always live during daylight hours — do not disconnect MC4 connectors yourself.
3. Wait 5 minutes for the inverter's capacitors to discharge safely.

Step 2: Reset the Tripped Breaker in the Switchboard

1. Open your household switchboard.
2. Identify the RCCB or MCB in the tripped position (the lever will be in the middle or fully down, depending on model).
3. Push the lever fully down first to clear the trip mechanism, then push it fully up to reset.
4. If it is an RCCB with a separate test button, after resetting, press the TEST button to verify it trips correctly, then reset again.

Step 3: Restart the Inverter

1. Turn the DC isolator switch back to ON.
2. Turn the AC isolator switch back to ON.
3. Wait 1–5 minutes. The inverter will perform a self-check (this is normal — inverters wait for grid stability before connecting).
4. The inverter display or LED should show "Normal" or "Feeding" within 5 minutes if sunlight is adequate.

Step 4: Confirm Recovery on Your Monitoring App

1. Open your monitoring app (iSolar Cloud, FusionSolar, or SolarEdge).
2. Within 10–15 minutes, the system should show as online and generating power.
3. If the app still shows offline after 20 minutes, try refreshing. If the fault persists, contact Sunollo.

What If the Breaker Trips Again Immediately After Reset?

Do not reset more than twice in succession. A breaker that trips repeatedly is detecting a real fault that resetting will not fix. This could be:

• A short circuit or earth fault in the DC wiring on the roof
• A failed inverter component
• Water ingress into a junction box
• A damaged cable with compromised insulation

Leave the system off and contact Sunollo for a site inspection. Running a system with an active fault can cause fire risk and may void your warranty.

Logging the Event

Each time your RCCB trips, note down:

• Date and time
• Weather conditions (raining, dry, cloudy)
• Which breaker tripped
• How many times it tripped
• Any error codes shown on the inverter

This log helps Sunollo diagnose patterns quickly if the tripping becomes frequent.