Voltage rise calculator
Check voltage rise across your inverter connection.
Calculation scope & engineering review
Uses documented AS/NZS 3008.1.1:2017 and AS/NZS 3008.1.1:2025 source data for supported calculations. Not independently verified by a licensed electrical engineer. Check results against the current published standards before use. New Zealand mode uses the 2017 Australian rating tables with New Zealand ambient conditions. Read assumptions and limitations.
Inverter output
Supply arrangement and inverter rating
Standard
Inverter output
kW ratings use the power factor to find the inverter current. Worst case (default): voltage rise uses the cable's full impedance, whatever the load power factor, for every rating unit. Specified: uses the power factor entered above.
Design limit
Maximum allowable voltage rise
Voltage rise limit
Default 2% per AS/NZS 4777.1-2024 — adjust if your DNSP specifies a different limit.
Maximum (default): every segment's resistance is read at its insulation's maximum permissible temperature, the conservative choice (75°C for V-90, the same basis as jCalc). Calculate: reads resistance at each cable's own calculated operating temperature under load, which gives a lower rise.
When enabled, mark the consumer cable mains segment in the route below. Its rise remains in the physical total but is excluded from the displayed design-limit assessment. Verify the installed control and your network service provider's requirements before applying this treatment.
Cable route
Add 2–5 segments, from inverter to point of supply