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Voltage Rise Calculator (Solar PV)

AS/NZS 4777.1:2024

✓ 2024 Standard🔆 Phase 2

Inputs

▶Advanced options

Typical: 240V for 1-phase, 400V for 3-phase

Default: 253V for 1-phase, 440V for 3-phase (AS 61000.3.100)

Results

Voltage Rise

4.81

V

2.1%

of 230V

Estimated Voltage at Inverter244.81 V
Compliance Margin8.19 V
✅

Voltage at Inverter

244.81 V (<= 253 V)

❌

Voltage Rise Limit

2.1 % (<= 2 %)

Voltage rise (2.1%) exceeds AS/NZS 4777.1 recommended 2% limit

Important: These results are indicative only. Voltage rise calculations are based on cable resistance data and may not account for all network conditions. Do not use for final design without independent verification from a qualified electrical engineer.

Voltage Rise Guide — AS/NZS 4777.1:2024

Solar PV inverters export power back to the grid. This creates voltage rise along the cable from the inverter to the point of interconnection (POI/meter). AS/NZS 4777.1:2024 recommends keeping voltage rise below 2% to avoid damaging the distribution network.

This calculator estimates the voltage at the inverter terminals based on the existing voltage at the meter, cable length, and inverter rating. If the estimated voltage exceeds the maximum allowed (typically 253V for single-phase, 440V for three-phase), the installation requires mitigation.

Disclaimer: This calculator is a guide only. Always verify with the current standards and consult a qualified electrical engineer for final design.