70 Amp Cable Size at 80 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 70 A over 80 m (262.5 ft).
Copper Cable (≤3% Drop)400 mm²Drop: 0.6V (2.5%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.99V (4.12%)
Voltage at Load23.4 VLine Loss: 41.9 W
Max Power & Breaker1.68 kW70A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 70A at 80m
| 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 | 159.79 V (665.78%) | 0.0 V | 263.57 V (1098.22%) | 11185.1 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 95.87 V (399.47%) | 0.0 V | 158.14 V (658.93%) | 6711.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 59.92 V (249.67%) | 0.0 V | 98.84 V (411.83%) | 4194.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 39.95 V (166.44%) | 0.0 V | 65.89 V (274.56%) | 2796.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 23.97 V (99.87%) | 0.0 V | 39.54 V (164.73%) | 1677.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 14.98 V (62.42%) | 9.0 V | 24.71 V (102.96%) | 1048.6 W | Drop High |
| 25 mm² | 101 A | 78 A | 9.59 V (39.95%) | 14.4 V | 15.81 V (65.89%) | 671.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.85 V (28.53%) | 17.2 V | 11.3 V (47.07%) | 479.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 4.79 V (19.97%) | 19.2 V | 7.91 V (32.95%) | 335.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.42 V (14.27%) | 20.6 V | 5.65 V (23.53%) | 239.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.52 V (10.51%) | 21.5 V | 4.16 V (17.34%) | 176.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.0 V (8.32%) | 22.0 V | 3.29 V (13.73%) | 139.8 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.6 V (6.66%) | 22.4 V | 2.64 V (10.98%) | 111.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.3 V (5.4%) | 22.7 V | 2.14 V (8.9%) | 90.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.0 V (4.16%) | 23.0 V | 1.65 V (6.86%) | 69.9 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 0.8 V (3.33%) | 23.2 V | 1.32 V (5.49%) | 55.9 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.6 V (2.5%) | 23.4 V | 0.99 V (4.12%) | 41.9 W | ✓ OK (≤3%) |
FAQ — 70 Amp Cable Size at 80 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 70A at 80 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 400 mm² copper cable for 70A over 80m at 24V (voltage drop: 0.6V or 2.5%).
What is the power capacity of 70A at 24V?
At unity power factor, 70A at 24V supports 1.68 kW with a standard 70A circuit breaker.
Related Lengths & Currents (24V)
70A · 5m (24V)70A · 10m (24V)70A · 15m (24V)70A · 20m (24V)70A · 25m (24V)70A · 30m (24V)70A · 35m (24V)70A · 40m (24V)70A · 45m (24V)70A · 50m (24V)70A · 60m (24V)70A · 70m (24V)10A · 80m (24V)16A · 80m (24V)20A · 80m (24V)25A · 80m (24V)32A · 80m (24V)40A · 80m (24V)50A · 80m (24V)63A · 80m (24V)80A · 80m (24V)100A · 80m (24V)125A · 80m (24V)160A · 80m (24V)200A · 80m (24V)