Experiencing unexpected power loss from your solar panel system? This may be due to your RCCB tripping. While it is not necessarily a sign of a serious fault, it commonly occurs in Singapore due to our high humidity, and could lead to a decrease in efficiency of your solar panel system. This guide walks you through understanding why solar RCCBs trip, how to diagnose the root causes, and how to restore your system safely and effectively.
An RCCB in a solar PV system is designed to detect earth leakage currentstypically caused by stray capacitance or moisture. When leakage exceeds a safe threshold (typically 30mA), the RCCB disconnects the solar inverter from the grid. This is a normal protective behavior and not necessarily indicative of a fault in the system.
Inverters with degraded insulation or internal component faults may leak current to ground. Some inverters also have built-in leakage monitoring that can trigger RCCB tripping if thresholds are exceeded.
Sudden voltage spikes from nearby lightning strikes or grid disturbances can cause transient leakage currents that trip the RCCB.
Solar panels mounted on metallic frames or rooftops can develop stray capacitance between the live conductors and the grounded structure. During high humidity or rain, this capacitance allows leakage current to flow to earth, which can trip the RCCB even though there is no actual fault.
Fixing your RCCB when it trips is extremely simple, and only requires 2 steps
Locate the RCCB in your distribution board or solar panel area. Afterwards, flip the switch back to the ‘ON’ position to restore power to your solar system.
Let your solar installer or maintenance provider know that the RCCB tripped. This helps them track how often it occurs and determine if any further inspection or adjustments are needed.
ℹ️ Note: Occasional RCCB tripping during wet weather is common in PV systems due to stray capacitance. It’s not usually a sign of a serious fault, but consistent tracking helps ensure long-term system health.
Immediately reduce consumption in your bill, you can access tax deductions and resell unused energy, start saving now !
Exposure & inclination calc
Fast and efficient charging
100% recycled materials
Different dimensions of the panels
Always a technician by your side
Included in the service
