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Strumento per cavi fotovoltaici

Calcolatore della sezione del cavo solare

// DIMENSIONI DELLA SORGENTE FV E DEI CONDUTTORI DI USCITA DAL MODULO ISC, STRINGHE PARALLELE, LUNGHEZZA DEL TRATTO, TENSIONE, MARGINE DI PORTATA E TARGET DI CADUTA DI TENSIONE //

PV_INPUTS

Use the short-circuit current from the module nameplate.

Count strings combined on this conductor segment.

Distance from array combiner to controller, inverter, or disconnect.

PV_SIZE_RESULT
Recommended minimum
8 AWG

8.4 mm², passing ampacity and 3% voltage drop.

Estimated drop
2.28%

3.42 V at the PV design current.

Array Isc
22.4 A
Required ampacity
35.0 A
Drop current
28.0 A

This is a planning minimum. Verify conductor insulation, wet-location rating, rooftop temperature correction, terminal ratings, and overcurrent protection before installation.

14 AWG
2.1 mm²
Ampacity
15.0 A
Drop
9.17%
Status
No
12 AWG
3.3 mm²
Ampacity
20.0 A
Drop
5.76%
Status
No
10 AWG
5.3 mm²
Ampacity
30.0 A
Drop
3.61%
Status
No
8 AWG
8.4 mm²
Ampacity
40.0 A
Drop
2.28%
Status
Pass
6 AWG
13.3 mm²
Ampacity
55.0 A
Drop
1.47%
Status
Pass
4 AWG
21.1 mm²
Ampacity
70.0 A
Drop
0.92%
Status
Pass
3 AWG
26.7 mm²
Ampacity
85.0 A
Drop
0.73%
Status
Pass
2 AWG
33.6 mm²
Ampacity
95.0 A
Drop
0.58%
Status
Pass
1 AWG
42.4 mm²
Ampacity
110 A
Drop
0.46%
Status
Pass
1/0 AWG
53.5 mm²
Ampacity
125 A
Drop
0.36%
Status
Pass
2/0 AWG
67.4 mm²
Ampacity
145 A
Drop
0.29%
Status
Pass
3/0 AWG
85.0 mm²
Ampacity
165 A
Drop
0.23%
Status
Pass
4/0 AWG
107.2 mm²
Ampacity
195 A
Drop
0.18%
Status
Pass
PV_CURRENT_BASIS

PV source and output circuits are commonly sized from module short-circuit current, not only operating current.

The 156% option represents a conservative NEC-style planning screen: array Isc times 125%, then another 125% ampacity factor.

Use the 125% option only when your design method, equipment listing, or local code path supports that basis.

VOLTAGE_DROP

Voltage drop is calculated over the round-trip DC conductor path.

Low-voltage battery and charge-controller circuits are much more sensitive to drop than 300 V or 600 V PV strings.

A 2% to 3% target is typical when energy harvest and inverter performance matter.

FIELD_LIMITS

Rooftop conduit, high ambient temperature, and bundled circuits can require additional ampacity correction.

Outdoor PV wiring must use insulation and cable assemblies rated for the actual wet, UV, and temperature exposure.

Always coordinate conductor size with disconnects, fuses, terminals, combiner boxes, and equipment instructions.

RELATED_TOOLS

Voltage Drop Calculator

Check the voltage-drop math directly for long PV source and inverter output runs.

Ampacity Calculator

Review conductor ampacity, temperature ratings, and derating assumptions separately.

Conduit Fill Calculator

Plan raceway fill when PV circuits are grouped in conduit.

Cable Size Calculator

Compare this PV result against a general cable sizing workflow.

Wire Resistance Calculator

Inspect conductor resistance when losses or heat need closer review.

Wire Weight Calculator

Estimate handling weight for long outdoor cable pulls and rooftop runs.