45 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)400 mm²Drop: 0.58V (2.41%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.95V (3.97%)
Voltage at Load23.4 VLine Loss: 26.0 W
Max Power & Breaker1.08 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 120m
| Cross-Section (mm²) | Cu Ampacity | Al Ampacity | Cu Voltage Drop | Load Voltage | Al Voltage Drop | Power Loss | Status |
|---|---|---|---|---|---|---|---|
| 1.5 mm² | 16 A | 12 A | 154.08 V (642.0%) | 0.0 V | 254.16 V (1059.0%) | 6933.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 92.45 V (385.2%) | 0.0 V | 152.5 V (635.4%) | 4160.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 57.78 V (240.75%) | 0.0 V | 95.31 V (397.12%) | 2600.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 38.52 V (160.5%) | 0.0 V | 63.54 V (264.75%) | 1733.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 23.11 V (96.3%) | 0.9 V | 38.12 V (158.85%) | 1040.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 14.45 V (60.19%) | 9.6 V | 23.83 V (99.28%) | 650.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 9.24 V (38.52%) | 14.8 V | 15.25 V (63.54%) | 416.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.6 V (27.51%) | 17.4 V | 10.89 V (45.39%) | 297.2 W | Drop High |
| 50 mm² | 151 A | 118 A | 4.62 V (19.26%) | 19.4 V | 7.62 V (31.77%) | 208.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.3 V (13.76%) | 20.7 V | 5.45 V (22.69%) | 148.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.43 V (10.14%) | 21.6 V | 4.01 V (16.72%) | 109.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.93 V (8.03%) | 22.1 V | 3.18 V (13.24%) | 86.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.54 V (6.42%) | 22.5 V | 2.54 V (10.59%) | 69.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.25 V (5.21%) | 22.8 V | 2.06 V (8.59%) | 56.2 W | Drop High |
| 240 mm² | 415 A | 324 A | 0.96 V (4.01%) | 23.0 V | 1.59 V (6.62%) | 43.3 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 0.77 V (3.21%) | 23.2 V | 1.27 V (5.29%) | 34.7 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.58 V (2.41%) | 23.4 V | 0.95 V (3.97%) | 26.0 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 45A at 120 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 400 mm² copper cable for 45A over 120m at 24V (voltage drop: 0.58V or 2.41%).
What is the power capacity of 45A at 24V?
At unity power factor, 45A at 24V supports 1.08 kW with a standard 45A circuit breaker.
Related Lengths & Currents (24V)
45A · 5m (24V)45A · 10m (24V)45A · 15m (24V)45A · 20m (24V)45A · 25m (24V)45A · 30m (24V)45A · 35m (24V)45A · 40m (24V)45A · 45m (24V)45A · 50m (24V)45A · 60m (24V)45A · 70m (24V)10A · 120m (24V)16A · 120m (24V)20A · 120m (24V)25A · 120m (24V)32A · 120m (24V)40A · 120m (24V)50A · 120m (24V)63A · 120m (24V)80A · 120m (24V)100A · 120m (24V)125A · 120m (24V)160A · 120m (24V)200A · 120m (24V)