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AS/NZS 3000-2018
Solar Inverters Have Unusual Starting Characteristics
Unlike a resistive load (heater, lighting) that draws a steady current, a solar inverter's AC output can produce brief high-current transients during startup as the inverter synchronises to the grid and activates its output relay. These transients can nuisance-trip standard Type B circuit breakers — the most common type in Australian residential switchboards.
Circuit Breaker Types and Solar Compatibility
MCB Type | Instantaneous Trip (multiple of rated current) | Solar Suitability |
|---|---|---|
Type B | 3–5× rated current | May nuisance trip on inverter startup inrush — not recommended |
Type C | 5–10× rated current | Suitable for most single-phase solar inverters up to 10 kW |
Type D | 10–20× rated current | For inverters with high startup inrush — large three-phase inverters, inverter-chargers with large transformers |
Selecting the Correct Rating
The circuit breaker must be rated to:
Not nuisance trip during normal startup and operation (Type C typically)
Protect the cable — the breaker rating must not exceed the current-carrying capacity of the cable (per AS 3008 derated values)
Break the maximum fault current — the breaker's rated short-circuit capacity (typically 6 kA for residential, 10 kA for commercial) must exceed the prospective fault current at the connection point
RCBOs vs MCBs + Separate RCDs
An RCBO (Residual Current Circuit Breaker with Overcurrent protection) combines RCD and MCB functions in a single device. For solar circuits, an RCBO (Type A, 30 mA, Type C overcurrent characteristic) is the cleanest solution — one device provides both overcurrent and earth leakage protection on the solar AC circuit without consuming two DIN rail positions in the switchboard.
Engr. Jason Morales — Founder, SolarEnergyPH
