---
title: "Step-by-Step: How to Reset Your Solar System After an RCCB or MCB Trip"
description: Clear step-by-step guide for resetting your solar system's RCCB or MCB after a trip in Singapore. Includes safety checks, restart sequence, and when not to reset.
---
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# 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: Is it currently raining or
## 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.
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