Voltage Rise calculator
Voltage rise calculator para sa solar at embedded generation sa New Zealand at Australia, sinuri laban sa limit ng AS/NZS 4777.1.
Reads AS/NZS 3008.1.2:2017 (NZ), AS/NZS 3008.1.1:2017 and 2025 (AU) and AS/NZS 4777.1:2016. Tables checked 27 Sept 2026.
Subukan ang isang job 6
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Check solar voltage riseThe voltage rise on a 45 m cable from a 5 kW inverter.
- Check rise on a three‑phase inverterThe rise on a 10 kW three‑phase inverter cable of 30 m.
- Check rise on a long rural runThe rise on 5 kW over 80 m.
- Check rise against a 2 % limitThe rise on a 3 kW inverter in Australia against 2 %.
- Check rise on a battery inverterThe rise on a 5 kW battery inverter over 15 m.
- Check rise on a 30 kW arrayThe rise on a 30 kW commercial inverter over 40 m.
Mga input
Worked example gamit ang mga default na input.
- Mga phase
- Single phase
- Voltage
- 230 V
- Output ng inverter
- 5 kW
- Power factor
- 1
- Haba ng run
- 30 m
- Standard
- NZ · AS/NZS 3008.1.2
- Cable
- 10 mm² Tanso PVC 75 °C
- Limitasyon ng voltage rise
- 2 %
Voltage rise
1.26%
- Current ng inverter
- 21.74A
- Voltage rise
- 2.91V
- Pinakamahabang haba sa limit
- 47.44m
- Limitasyon ng voltage rise
- 2%
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Output current ng inverter21.74A
- Resistance2.23Ω/km
AS/NZS 3008.1.2:2017 Table 30 (Xc), Tables 34–35 (Rc) p.98, p.102–103
- mV/A·m4.46mV/A·m
AS/NZS 3008.1.2:2017 Cl 4.5
- Voltage rise2.91V
- Voltage rise, porsyentoResulta1.26%
- Pinakamahabang haba47.44m
Tungkol sa calculator na ito
How this is calculated
The tool works out the voltage rise on the cable between an inverter and its point of supply. It uses the cable data of AS/NZS 3008.1.2:2017. The Australian choice reads AS/NZS 3008.1.1:2025 and the superseded 2017 edition.
- Inverter current. The tool divides the inverter power by the voltage and the power factor. On three phases, it also divides by the square root of three.
- Resistance and reactance. It reads the conductor resistance from Tables 34 and 35. It reads the reactance from Table 30. It uses the value for your size, material and insulation.
- Millivolts per ampere metre. It combines both values with the power factor. This is the method of Cl 4.5.
- Voltage rise. It multiplies the millivolts per ampere metre by the current and the run length. It gives the result in volts and as a percentage of the supply voltage.
- Maximum length. It finds the run length at which the rise equals your limit.
The limit is an input. AS/NZS 3000:2018 Cl 3.6.2 Note 3 refers the rise limit to AS/NZS 4777.1. Check the current edition for the value that applies to your site.
Worked example
- 5 kW inverter on 30 m of 10 mm² copper. The supply is single‑phase at 230 V with a power factor of 1. The inverter current is 21.74 A. The voltage rise is 2.91 V, or 1.26 %. That is within a limit of 2 %. The longest run at that limit is 47.44 m.
Limits
The limit of 2 % is a default you can change. It is not a value read from a standard. The tool does not check the inverter voltage settings or the rules of the network operator.
The reactance is the Table 30 value for a multicore cable. A single‑core run reads a higher reactance for its formation. The tool does not size the cable for current. Use the cable size calculator for that.
See also: Solar inverter voltage rise at 5 kW, Voltage rise on a long rural PV run and the PV string tool.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng voltage rise calculator?
Kinakalkula ng tool ang inverter output current mula sa rating nito, sa voltage at sa power factor. Pagkatapos, kinakalkula nito ang voltage rise sa kahabaan ng cable papunta sa point of supply mo, sa volts at bilang porsyento. Iniuulat din nito ang pinakamahabang run na nakakatugon pa rin sa limit.
Anong voltage rise limit ang ginagamit ng tool?
Ginagamit ng tool ang 2 porsyento bilang sariling default, at puwede mo itong baguhin. Tinutukoy ng AS/NZS 3000:2018 Clause 3.6.2 Note 3 ang voltage rise sa AS/NZS 4777.1. Walang hawak na AS/NZS 4777.1 ang AmpSize. Basahin ang kasalukuyang edition ng AS/NZS 4777.1 para sa limit na nalalapat sa site mo.
Aling mga input ang pinakamahalaga?
Direktang nag-i-scale ang rise sa inverter rating at sa run length. Itinatakda ng laki at material ng conductor ang resistance. Limitado sa range na 0.8 hanggang 1 ang power factor, at default ito na 1, na karaniwang kaso para sa inverter. Hinahati ng mga cable na parallel ang impedance.
Ano pa ang dapat kong suriin?
Sakop lang ng tool na ito ang voltage rise sa inverter cable. Hindi nito sakop ang supply network, protection o anti islanding. Gamitin ang cable size tool para suriin ang current rating ng parehong cable. Nasa page address ang mga input, kaya muling nagagawa ng link ang kalkulasyon.
Mga worked example
- Solar string sizing for a 600 V inverterHow many 49.5 V modules fit a string on a 600 V inverter at −5 °C? Work cold Voc, hot Vmp, the string current, fuses and the d.c. isolator by AS/NZS 5033.
- Voltage rise for a 5 kW solar inverter cableA 5 kW single‑phase inverter 40 m from the switchboard on 10 mm² copper, with the rise in volts, the percent and the maximum length the tool returns.
Background
- Voltage drop basicsOhm's law on a cable, the mV/A·m shortcut, the percent limit and the maximum length, worked on a 25 A run over 35 m of 4 mm² copper.
- PV and inverter basicsHow a grid-connected PV system connects to an installation, why voltage rise sets the inverter cable, and which standards the AmpSize tools cannot quote.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3008.1.2:2017 Cl 4.5Voltage drop method
- AS/NZS 4777.1:2016 Cl 3.3Inverter connection voltage rise
- AS/NZS 3008.1.2:2017 Table 30, 34, 35Reactance at 50 Hz and a.c. resistance at 50 Hz
- AS/NZS 3008.1.1:2017 Table 30, 34, 35Reactance at 50 Hz and a.c. resistance at 50 Hz
- AS/NZS 3008.1.1:2025 Table 4.1(A), 4.1(B), 4.5(A), 4.5(B)Reactance at 50 Hz and a.c. resistance at 50 Hz
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 27 Sept 2026.
Mga kaugnay na tool
- PV string calculatorModules per string, string current and isolator for PV.AS/NZS 5033AS/NZS 4777.2
- Voltage drop calculatorCalculate voltage drop on a cable run and check the limit.AS/NZS 3008.1.2AS/NZS 3008.1.1AS/NZS 3000
- DC cable size calculatorSize a d.c. cable up to 1500 V for current and voltage drop.AS/NZS 3008.1.1
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