光伏组串计算器
光伏组件每串数量、组串电流及隔离开关。
Reads AS/NZS 5033:2021 and AS/NZS 4777.2:2020. Tables checked 2 Oct 2026.
尝试一个工程 8
每项工作都会预填示例数值。请替换为您自己的数值。
- 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.
输入
使用默认输入值的示例计算。
- 组件 Voc
- 49.5 V
- 组件 Vmp
- 41.5 V
- 组件 Isc
- 13.9 A
- Voc 温度系数
- −0.27 %/K
- Vmp 温度系数
- −0.35 %/K
- 组件最大串联熔断器
- 25 A
- 冷态电压修正
- 制造商系数，Cl 4.2.1.2(a)
- 历史最低温度
- −5 °C
- 历史最高温度
- 35 °C
- 电池温升（高于环境温度）
- 35 K
- 安装
- 住宅，1000 V 限值
- 每组串组件数
- 10
- 并联组串
- 2
- KI，双面系数
- 1
- 来自逆变器的回馈电流
- 0 A
- 组串熔断器额定值
- 0 A
- 逆变器最大直流电压
- 600 V
- MPPT 最小电压
- 150 V
- MPPT 最大电压
- 550 V
- 逆变器光伏 Isc
- 0 A
每组串组件数
5 至 11
- 组串最大电压
- 535.1V
- 最热电池时的组串 Vmp
- 349.6V
- 最大组串电流
- 17.38A
- 至逆变器的阵列电流
- 34.75A
- 直流隔离器，至少
- 34.75 A 在 535.1 V 时
- 组串熔断器
- Not called for
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- Voc 修正，1 + 系数 ×（Tmin − 25 °C）×1.08
AS/NZS 5033:2021 Cl 4.2.1.2
- 最冷电池时的组件最大电压53.51V
AS/NZS 5033:2021 Cl 4.2.1.2
- 住宅装置的限值1,000V
AS/NZS 5033:2021 Cl 3.1
- 每串最多组件数11
AS/NZS 5033:2021 Cl 4.2.1.3.1
- 最热电池，历史最高温度加温升70°C
- 最热电池时的组件 Vmp34.96V
- 满足 MPPT 最低要求的每串最少组件数5
- 组串最大电压535.1V
AS/NZS 5033:2021 Cl 4.2.1.3.1
- 最热电池片处的组串 Vmp349.6V
- 最冷电池时的组串 Vmp458.6V
- 最大组串电流，1.25 × KI × Isc17.38A
AS/NZS 5033:2021 Cl 3.3.3.1
- 其他串列的故障电流，(SA − 1) × ISTRING MAX17.38A
AS/NZS 5033:2021 Cl 3.3.3.2
- 组串熔断器范围，高于 1.2 × ISTRING MAX 且不超过组件额定值20.85 至 25A
AS/NZS 5033:2021 Table 3.1
- 组串电缆电流17.38A
AS/NZS 5033:2021 Table 4.2
- 至逆变器的阵列电缆电流34.75A
AS/NZS 5033:2021 Table 4.2
- 直流隔离开关电流额定值，至少34.75A
AS/NZS 5033:2021 Table 4.3
- 直流隔离开关电压额定值，至少535.1V
AS/NZS 5033:2021 Table 4.3
- 最小导体4mm²
AS/NZS 5033:2021 Cl 4.4.2.3
- 组件附近的电缆温度，最高记录温度加 40 K75°C
AS/NZS 5033:2021 Cl 4.4.2.2
关于此计算器
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.
问题
结果仅供设计参考。请依据现行标准核对。
本工具如何求出每串的最多组件数？
本工具按制造商系数或 AS/NZS 5033 Table 4.1，将组件开路电压 Voc 修正至历史最低温度。将逆变器最大值与 1000 V 或 1500 V 限值中较低者除以该电压，并向下取整。
本工具如何求出每串的最少组件数？
工具按最热电池单体计算组件 Vmp：即记录最高气温加上您输入的电池温升。它将 MPPT 最小电压除以该电压并向上取整。AS/NZS 5033 未规定电池温升，因此 35 K 默认值为 AmpSize 的假设。
组串何时需要熔断器？
当组串并联运行时，其他组串可能向某一组串的故障点馈入电流。工具将该电流加入反向馈电，并与组件的最大串联熔断器额定值比较。若该电流更高，则熔断器应高于最大组串电流的 1.2 倍，且不超过组件额定值。
AS/NZS 5033 的数值是否已核对？
是的。Table 4.1 以及电压、电流和电缆限值，均依据 AS/NZS 5033:2021 的印刷页面核对。依赖任何数值前，请对照现行标准逐项核对。
计算示例
- 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.
背景
- 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.
本工具读取的条款和表格
- 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
表格最后核对于 2 Oct 2026。
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