45 Amp Cable Size at 15 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 15 m (49.2 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 0.58V (2.41%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 0.68V (2.84%)
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 15m
| 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 | 19.26 V (80.25%) | 4.7 V | 31.77 V (132.38%) | 866.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 11.56 V (48.15%) | 12.4 V | 19.06 V (79.42%) | 520.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 7.22 V (30.09%) | 16.8 V | 11.91 V (49.64%) | 325.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 4.81 V (20.06%) | 19.2 V | 7.94 V (33.09%) | 216.7 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.89 V (12.04%) | 21.1 V | 4.77 V (19.86%) | 130.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.81 V (7.52%) | 22.2 V | 2.98 V (12.41%) | 81.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.16 V (4.81%) | 22.8 V | 1.91 V (7.94%) | 52.0 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 0.83 V (3.44%) | 23.2 V | 1.36 V (5.67%) | 37.1 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 0.58 V (2.41%) | 23.4 V | 0.95 V (3.97%) | 26.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.41 V (1.72%) | 23.6 V | 0.68 V (2.84%) | 18.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.3 V (1.27%) | 23.7 V | 0.5 V (2.09%) | 13.7 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.24 V (1.0%) | 23.8 V | 0.4 V (1.65%) | 10.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.19 V (0.8%) | 23.8 V | 0.32 V (1.32%) | 8.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.16 V (0.65%) | 23.8 V | 0.26 V (1.07%) | 7.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.12 V (0.5%) | 23.9 V | 0.2 V (0.83%) | 5.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.1 V (0.4%) | 23.9 V | 0.16 V (0.66%) | 4.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.07 V (0.3%) | 23.9 V | 0.12 V (0.5%) | 3.3 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 15 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 45A at 15 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 45A over 15m 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 · 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 · 15m (24V)16A · 15m (24V)20A · 15m (24V)25A · 15m (24V)32A · 15m (24V)40A · 15m (24V)50A · 15m (24V)63A · 15m (24V)80A · 15m (24V)100A · 15m (24V)125A · 15m (24V)160A · 15m (24V)200A · 15m (24V)