750 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 750 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)28× 400 mm²Drop: 0.72V (2.99%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 33.09V (137.89%)
Voltage at Load23.3 VLine Loss: 537.4 W
Max Power & Breaker18.0 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 750A at 250m
| 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 | 5350.0 V (22291.67%) | 0.0 V | 8825.0 V (36770.83%) | 4012500.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 3210.0 V (13375.0%) | 0.0 V | 5295.0 V (22062.5%) | 2407500.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 2006.25 V (8359.37%) | 0.0 V | 3309.37 V (13789.06%) | 1504687.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 1337.5 V (5572.92%) | 0.0 V | 2206.25 V (9192.71%) | 1003125.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 802.5 V (3343.75%) | 0.0 V | 1323.75 V (5515.62%) | 601875.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 501.56 V (2089.84%) | 0.0 V | 827.34 V (3447.27%) | 376171.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 321.0 V (1337.5%) | 0.0 V | 529.5 V (2206.25%) | 240750.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 229.29 V (955.36%) | 0.0 V | 378.21 V (1575.89%) | 171964.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 160.5 V (668.75%) | 0.0 V | 264.75 V (1103.12%) | 120375.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 114.64 V (477.68%) | 0.0 V | 189.11 V (787.95%) | 85982.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 84.47 V (351.97%) | 0.0 V | 139.34 V (580.59%) | 63355.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 66.88 V (278.65%) | 0.0 V | 110.31 V (459.64%) | 50156.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 53.5 V (222.92%) | 0.0 V | 88.25 V (367.71%) | 40125.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 43.38 V (180.74%) | 0.0 V | 71.55 V (298.14%) | 32533.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 33.44 V (139.32%) | 0.0 V | 55.16 V (229.82%) | 25078.1 W | Drop High |
| 300 mm² | 477 A | 372 A | 26.75 V (111.46%) | 0.0 V | 44.12 V (183.85%) | 20062.5 W | Drop High |
| 400 mm² | 570 A | 445 A | 20.06 V (83.59%) | 3.9 V | 33.09 V (137.89%) | 15046.9 W | Drop High |
FAQ — 750 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 750A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 28× 400 mm² copper cable for 750A over 250m at 24V (voltage drop: 0.72V or 2.99%).
What is the power capacity of 750A at 24V?
At unity power factor, 750A at 24V supports 18.0 kW with a standard 800A circuit breaker.
Related Lengths & Currents (24V)
750A · 5m (24V)750A · 10m (24V)750A · 15m (24V)750A · 20m (24V)750A · 25m (24V)750A · 30m (24V)750A · 35m (24V)750A · 40m (24V)750A · 45m (24V)750A · 50m (24V)750A · 60m (24V)750A · 70m (24V)10A · 250m (24V)16A · 250m (24V)20A · 250m (24V)25A · 250m (24V)32A · 250m (24V)40A · 250m (24V)50A · 250m (24V)63A · 250m (24V)80A · 250m (24V)100A · 250m (24V)125A · 250m (24V)160A · 250m (24V)200A · 250m (24V)