Breaker & Protection Sizing — PTG Solar

Right-sized breakers, wiring, SPDs, and enclosure — every time.

Select your inverter rating, string/MPPT count, and ATS type. We'll size the AC and DC breakers, wire gauge, battery cables, surge protection, and combiner box enclosure from PTG Solar's engineering reference table.

This calculator applies to low-voltage, single-phase solar power setups.

For single-phase, low-voltage residential solar setups only. Commercial or three-phase systems require a separate site assessment.

System Configuration

For low-voltage, single-phase solar setups. Values are sized directly from PTG Solar's breaker & protection reference table.

Inverter Rating (kW) Only ratings available in the reference table are listed.

Strings / MPPT Defaults to 1. Determines PV MCB/DC SPD quantity and DIN rail enclosure sizing.

ATS Type

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