100 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 100 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)4× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 4.41V (18.39%)
Voltage at Load23.3 VLine Loss: 66.9 W
Max Power & Breaker2.4 kW100A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 100A 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 | 713.33 V (2972.22%) | 0.0 V | 1176.67 V (4902.78%) | 71333.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 428.0 V (1783.33%) | 0.0 V | 706.0 V (2941.67%) | 42800.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 267.5 V (1114.58%) | 0.0 V | 441.25 V (1838.54%) | 26750.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 178.33 V (743.06%) | 0.0 V | 294.17 V (1225.69%) | 17833.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 107.0 V (445.83%) | 0.0 V | 176.5 V (735.42%) | 10700.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 66.88 V (278.65%) | 0.0 V | 110.31 V (459.64%) | 6687.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 42.8 V (178.33%) | 0.0 V | 70.6 V (294.17%) | 4280.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 30.57 V (127.38%) | 0.0 V | 50.43 V (210.12%) | 3057.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 21.4 V (89.17%) | 2.6 V | 35.3 V (147.08%) | 2140.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 15.29 V (63.69%) | 8.7 V | 25.21 V (105.06%) | 1528.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 11.26 V (46.93%) | 12.7 V | 18.58 V (77.41%) | 1126.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 8.92 V (37.15%) | 15.1 V | 14.71 V (61.28%) | 891.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 7.13 V (29.72%) | 16.9 V | 11.77 V (49.03%) | 713.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 5.78 V (24.1%) | 18.2 V | 9.54 V (39.75%) | 578.4 W | Drop High |
| 240 mm² | 415 A | 324 A | 4.46 V (18.58%) | 19.5 V | 7.35 V (30.64%) | 445.8 W | Drop High |
| 300 mm² | 477 A | 372 A | 3.57 V (14.86%) | 20.4 V | 5.88 V (24.51%) | 356.7 W | Drop High |
| 400 mm² | 570 A | 445 A | 2.67 V (11.15%) | 21.3 V | 4.41 V (18.39%) | 267.5 W | Drop High |
FAQ — 100 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 100A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4× 400 mm² copper cable for 100A over 250m at 24V (voltage drop: 0.67V or 2.79%).
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)100A · 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)125A · 250m (24V)160A · 250m (24V)200A · 250m (24V)