45 Amp Cable Size at 70 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 70 m (229.7 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 0.56V (2.34%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.56V (2.32%)
Voltage at Load23.4 VLine Loss: 25.3 W
Max Power & Breaker1.08 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 70m
| 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 | 89.88 V (374.5%) | 0.0 V | 148.26 V (617.75%) | 4044.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 53.93 V (224.7%) | 0.0 V | 88.96 V (370.65%) | 2426.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 33.7 V (140.44%) | 0.0 V | 55.6 V (231.66%) | 1516.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 22.47 V (93.63%) | 1.5 V | 37.06 V (154.44%) | 1011.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.48 V (56.17%) | 10.5 V | 22.24 V (92.66%) | 606.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 8.43 V (35.11%) | 15.6 V | 13.9 V (57.91%) | 379.2 W | Drop High |
| 25 mm² | 101 A | 78 A | 5.39 V (22.47%) | 18.6 V | 8.9 V (37.06%) | 242.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 3.85 V (16.05%) | 20.1 V | 6.35 V (26.47%) | 173.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 2.7 V (11.24%) | 21.3 V | 4.45 V (18.53%) | 121.3 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.93 V (8.03%) | 22.1 V | 3.18 V (13.24%) | 86.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.42 V (5.91%) | 22.6 V | 2.34 V (9.75%) | 63.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.12 V (4.68%) | 22.9 V | 1.85 V (7.72%) | 50.6 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 0.9 V (3.74%) | 23.1 V | 1.48 V (6.18%) | 40.4 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 0.73 V (3.04%) | 23.3 V | 1.2 V (5.01%) | 32.8 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 0.56 V (2.34%) | 23.4 V | 0.93 V (3.86%) | 25.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.45 V (1.87%) | 23.6 V | 0.74 V (3.09%) | 20.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.34 V (1.4%) | 23.7 V | 0.56 V (2.32%) | 15.2 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 45A at 70 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 45A over 70m at 24V (voltage drop: 0.56V or 2.34%).
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)10A · 70m (24V)16A · 70m (24V)20A · 70m (24V)25A · 70m (24V)32A · 70m (24V)40A · 70m (24V)50A · 70m (24V)63A · 70m (24V)80A · 70m (24V)100A · 70m (24V)125A · 70m (24V)160A · 70m (24V)200A · 70m (24V)