Tātaitai PV string
Ngā module ia string, te iahiko string me te isolator mō te PV.
Reads AS/NZS 5033:2021 and AS/NZS 4777.2:2020. Tables checked 2 Oct 2026.
Whakamātau mahi 8
Ka whakakī ia mahi i ngā uara tauira. Whakakapia ērā ki ō uara.
- Size solar strings for a 600 V inverterThe modules per string for 49.5 V modules on a 600 V inverter at −5 °C.
- Check string fuses on three parallel stringsWhether three parallel strings of 13.9 A modules call for string fuses, and their rating.
- Size strings for a 1000 V inverterThe modules per string for a commercial inverter.
- Size strings for a cold inland siteThe modules per string at a record low of −8 °C, on a 600 V inverter.
- Check a string on a hot roofWhether the hot voltage stays above the tracker's minimum.
- Check two strings need no fuseWhether two strings in parallel need string fuses.
- Check the array current at the inverterThe array's short-circuit current against the inverter input.
- Size strings for a house trackerThe modules per string for a 450 V window.
Ngā whakauru
He tauira mahi me ngā whakauru taunoa.
- Module Voc
- 49.5 V
- Module Vmp
- 41.5 V
- Module Isc
- 13.9 A
- Tauwhāinga pāmahana Voc
- −0.27 %/K
- Tauwhāinga pāmahana Vmp
- −0.35 %/K
- Pūtau aho teitei rawa o te module
- 25 A
- Whakatikatanga hiko mātao
- Tauwhiwhi a te kaihanga, Cl 4.2.1.2(a)
- Pāmahana iti rawa i rekodia
- −5 °C
- Pāmahana teitei rawa i rekodia
- 35 °C
- Piki o te pūtau i runga i te pāmahana taiao
- 35 K
- Whakaurunga
- Kāinga, rohe 1000 V
- Ngā module ia takirua
- 10
- Ngā aho takirua
- 2
- KI, tauwhiwhi takiruarua
- 1
- Ia whakahoki mai i te inverter
- 0 A
- Whakatauhanga fuse aho
- 0 A
- Uara d.c. teitei rawa o te inverter
- 600 V
- Uara MPPT iti rawa
- 150 V
- Uara MPPT teitei rawa
- 550 V
- Inverter Isc PV
- 0 A
Ngā module ia takirua
5 ki 11
- Hiko nui rawa o te string
- 535.1V
- String Vmp i te pūtau wera rawa
- 349.6V
- Te iahiko string nui rawa
- 17.38A
- Ia rārangi ki te inverter
- 34.75A
- Whakawehe d.c., iti rawa
- 34.75 A i 535.1 V
- Fuse string
- Not called for
He āwhina hoahoa tēnei hua. Manatokohia ki te paerewa o nāianei.
Ngā hīkoi tātaitanga
- Whakatika Voc, 1 + coefficient × (Tmin − 25 °C)×1.08
AS/NZS 5033:2021 Cl 4.2.1.2
- Voltage nui rawa o te module i te pūtau matao rawa53.51V
AS/NZS 5033:2021 Cl 4.2.1.2
- Rohe mō tētahi whakaurunga kāinga1,000V
AS/NZS 5033:2021 Cl 3.1
- Te nui rawa o ngā module ia aho11
AS/NZS 5033:2021 Cl 4.2.1.3.1
- Pūtau wera rawa, te teitei rekoata me te piki70°C
- Vmp module i te pūtau wera rawa34.96V
- Te iti rawa o ngā module ia aho mō te iti rawa MPPT5
- Whakahiato aho nui rawa535.1V
AS/NZS 5033:2021 Cl 4.2.1.3.1
- Vmp o te aho i te pūtau mahana rawa349.6V
- String Vmp i te pūtau makariri rawa458.6V
- Au aho nui rawa, 1.25 × KI × Isc17.38A
AS/NZS 5033:2021 Cl 3.3.3.1
- Au hapa mai i ngā aho atu, (SA − 1) × ISTRING MAX17.38A
AS/NZS 5033:2021 Cl 3.3.3.2
- Wahitaka fuse string, i runga ake i te 1.2 × ISTRING MAX, ā, he iti rawa atu i te module rating20.85 ki te 25A
AS/NZS 5033:2021 Table 3.1
- Au taura aho17.38A
AS/NZS 5033:2021 Table 4.2
- Ia waea rārangi ki te inverter34.75A
AS/NZS 5033:2021 Table 4.2
- Ine au isolator d.c., he iti rawa atu34.75A
AS/NZS 5033:2021 Table 4.3
- Ine hiko isolator d.c., he iti rawa atu535.1V
AS/NZS 5033:2021 Table 4.3
- Kaiwhakahaere iti rawa4mm²
AS/NZS 5033:2021 Cl 4.4.2.3
- Pāmahana waea tata ki ngā module, te teitei rawa i rekodia tāpiri 40 K75°C
AS/NZS 5033:2021 Cl 4.4.2.2
Mō tēnei tātaitai
How this is calculated
The tool sizes a PV string. It finds how many modules fit in a string, the string current, the fuses and the d.c. isolator. It reads AS/NZS 5033:2021. It reads the inverter limits from the plate you enter.
- Cold voltage. The tool corrects the module Voc for the coldest cell (Cl 4.2.1.2). The factor is 1 + coefficient × (Tmin − 25 °C). Tmin is the record low.
- Most modules. It divides the voltage limit by the corrected Voc. The limit is the lower of the inverter maximum and the domestic limit in Cl 3.1 (Cl 4.2.1.3.1).
- Fewest modules. It finds the hot cell as the record high plus the cell rise you enter. It then finds the fewest modules that keep Vmp above the MPPT minimum.
- String current. It works 1.25 × KI × Isc (Cl 3.3.3.1). It adds the fault current from the other strings (Cl 3.3.3.2).
- Fuses. A fuse window sits above 1.2 times the string current and at most the module rating (Table 3.1).
- Cable and isolator. It gives the cable currents (Table 4.2), the isolator ratings (Table 4.3) and the smallest conductor (Cl 4.4.2.3).
| Step | Table or clause | What it decides |
|---|---|---|
| Cold voltage | Cl 4.2.1.2 | The module voltage at the coldest cell |
| String length | Cl 4.2.1.3.1 | The most modules in a string |
| String current | Cl 3.3.3.1 and Cl 3.3.3.2 | The current for cable and fuse |
| Fuse window | Table 3.1 | The fuse range |
| Isolator | Table 4.3 | The current and voltage ratings |
Worked example
- 10 modules of 49.5 V Voc, 2 strings, 600 V inverter. The tool gives 5 to 11 modules per string. The string maximum voltage is 535.1 V. The string current is 17.38 A and the array current is 34.75 A. No string fuses are called for.
Limits
- The tool derives the AS/NZS 5033 figures from the text until the Standard is checked. It says so in a warning.
- AS/NZS 5033 sets no cell rise. The tool uses the rise you enter.
- The inverter limits are the ones on its plate. Read them from the data sheet.
- The tool does not size the cable. Use the DC cable size calculator at these currents and at the hot cable temperature.
- Above 120 V, hold the voltage drop from the furthest module to the inverter to 5 % of Vmp.
See also: PV string voltage and temperature, Solar string sizing for a 600 V inverter and PV and inverter basics.
Pātai
He āwhina hoahoa te hua. Manatokohia ki te paerewa o nāianei.
Me pēhea e kitea ai e te taputapu te nui rawa o ngā module ia PV string?
Ka whakatika i te Voc o te module ki te pāmahana iti rawa i tuhia, mā te coefficient a te kaihanga, mā AS/NZS 5033 Table 4.1 rānei. Ka wehea te iti ake o te teitei rawa o te inverter me te tepe 1000 V, 1500 V rānei, ki taua voltage, ā, ka whakaiti.
Me pēhea e kitea ai e te taputapu te iti rawa o ngā module ia PV string?
Ka mahi ia i te Vmp o te module i te kōpuku wera rawa: te teitei rekoata me te piki kōpuku ka whakauru koe. Ka wehea e ia te iti rawa MPPT ki taua voltage, ā, ka whakatiketike. Kāore he piki kōpuku a AS/NZS 5033, nā reira ko te 35 K ā-taunoa he whakaaro nā AmpSize.
Āhea te string e whai ai i tētahi fuse?
Ina rere takirua ngā string, ka taea e ētahi atu te whāngai i tētahi hapa i tētahi string. Ka tāpiri te taputapu i taua iahiko ki te backfeed, ā, ka whakatauritea ki te maximum series fuse o te module. Ina teitei ake, ka tū te fuse i runga i te 1.2 ngā wā o te iahiko string teitei rawa, ā, kei te reiti module, kei raro iho rānei.
Kua manatokotia ngā tatauranga AS/NZS 5033?
Āe. I pānuitia a Table 4.1 me ngā tepe voltage, iahiko me te taura ki ngā whārangi tā o AS/NZS 5033:2021. Arotakehia ia tauāhua ki te paerewa o nāianei i mua i tō whakawhirinaki ki a ia.
Ngā tauira mahi
- DC isolator rating for a 10 kW solar arrayRate the d.c. isolator and size the frame earth for a four-string domestic array. Check one data sheet that passes and one that fails per pole.
- 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.
Kōrero o muri
- PV array isolators and earthingHow parallel strings feed a fault, what Ithe, Ie and make and break mean for a d.c. isolator, and how AS/NZS 5033 earths and alarms a PV array.
- PV string voltage and temperatureWhy a PV string's voltage rises in the cold and falls in the heat, how AS/NZS 5033 limits it, and how the string current, fuses and isolator follow.
Ngā Clause me ngā Table e pānuitia ana e tēnei taputapu
- AS/NZS 5033:2021 Cl 3.1Maximum voltage of PV d.c. circuits
- AS/NZS 5033:2021 Cl 3.3.3.1Maximum string current
- AS/NZS 5033:2021 Cl 3.3.3.2Fault current from parallel strings
- AS/NZS 5033:2021 Cl 3.3.4.1When strings take overcurrent protection
- AS/NZS 5033:2021 Cl 4.2.1.2PV module maximum voltage
- AS/NZS 5033:2021 Cl 4.2.1.3.1String voltage limit
- AS/NZS 5033:2021 Cl 4.4.2.2PV cable temperature
- AS/NZS 5033:2021 Cl 4.4.2.3Smallest PV conductor
Ia Clause me Table, me te pēhea i manatokotia ai ia tētahi
Ngā tūtohi i arotakehia whakamutunga i te 2 Oct 2026.
Ngā taputapu hononga
- Tātaitai rahi taura DCSize a d.c. cable up to 1500 V for current and voltage drop.AS/NZS 3008.1.1
- Tātaitai PV isolator me te whakawhenuaRate the PV array cables, d.c. isolator and earthing.AS/NZS 5033AS/NZS 3000
- Tātaitai power factor correctionFind the capacitor kvar to lift a power factor.AS/NZS 3000
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