100 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 100 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.38V (1.56%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.24V (5.15%)
Voltage at Load23.6 VLine Loss: 37.5 W
Max Power & Breaker2.4 kW100A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 100A 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 | 199.73 V (832.22%) | 0.0 V | 329.47 V (1372.78%) | 19973.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 119.84 V (499.33%) | 0.0 V | 197.68 V (823.67%) | 11984.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 74.9 V (312.08%) | 0.0 V | 123.55 V (514.79%) | 7490.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 49.93 V (208.06%) | 0.0 V | 82.37 V (343.19%) | 4993.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 29.96 V (124.83%) | 0.0 V | 49.42 V (205.92%) | 2996.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 18.73 V (78.02%) | 5.3 V | 30.89 V (128.7%) | 1872.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 11.98 V (49.93%) | 12.0 V | 19.77 V (82.37%) | 1198.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 8.56 V (35.67%) | 15.4 V | 14.12 V (58.83%) | 856.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 5.99 V (24.97%) | 18.0 V | 9.88 V (41.18%) | 599.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.28 V (17.83%) | 19.7 V | 7.06 V (29.42%) | 428.0 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.15 V (13.14%) | 20.8 V | 5.2 V (21.68%) | 315.4 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.5 V (10.4%) | 21.5 V | 4.12 V (17.16%) | 249.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.0 V (8.32%) | 22.0 V | 3.29 V (13.73%) | 199.7 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.62 V (6.75%) | 22.4 V | 2.67 V (11.13%) | 161.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.25 V (5.2%) | 22.8 V | 2.06 V (8.58%) | 124.8 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.0 V (4.16%) | 23.0 V | 1.65 V (6.86%) | 99.9 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.75 V (3.12%) | 23.3 V | 1.24 V (5.15%) | 74.9 W | ~ ≤5% |
FAQ — 100 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 100A at 70 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 100A over 70m at 24V (voltage drop: 0.38V or 1.56%).
What is the power capacity of 100A at 24V?
At unity power factor, 100A at 24V supports 2.4 kW with a standard 100A circuit breaker.
Related Lengths & Currents (24V)
100A · 5m (24V)100A · 10m (24V)100A · 15m (24V)100A · 20m (24V)100A · 25m (24V)100A · 30m (24V)100A · 35m (24V)100A · 40m (24V)100A · 45m (24V)100A · 50m (24V)100A · 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)125A · 70m (24V)160A · 70m (24V)200A · 70m (24V)