250 Amp Cable Size at 45 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 250 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.6V (2.51%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.99V (8.27%)
Voltage at Load23.4 VLine Loss: 150.4 W
Max Power & Breaker6.0 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A at 45m
| 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 | 321.0 V (1337.5%) | 0.0 V | 529.5 V (2206.25%) | 80250.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 192.6 V (802.5%) | 0.0 V | 317.7 V (1323.75%) | 48150.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 120.38 V (501.56%) | 0.0 V | 198.56 V (827.34%) | 30093.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 80.25 V (334.38%) | 0.0 V | 132.38 V (551.56%) | 20062.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 48.15 V (200.62%) | 0.0 V | 79.42 V (330.94%) | 12037.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 30.09 V (125.39%) | 0.0 V | 49.64 V (206.84%) | 7523.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 19.26 V (80.25%) | 4.7 V | 31.77 V (132.37%) | 4815.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 13.76 V (57.32%) | 10.2 V | 22.69 V (94.55%) | 3439.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 9.63 V (40.12%) | 14.4 V | 15.88 V (66.19%) | 2407.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 6.88 V (28.66%) | 17.1 V | 11.35 V (47.28%) | 1719.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.07 V (21.12%) | 18.9 V | 8.36 V (34.84%) | 1267.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.01 V (16.72%) | 20.0 V | 6.62 V (27.58%) | 1003.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.21 V (13.38%) | 20.8 V | 5.29 V (22.06%) | 802.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.6 V (10.84%) | 21.4 V | 4.29 V (17.89%) | 650.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.01 V (8.36%) | 22.0 V | 3.31 V (13.79%) | 501.6 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.6 V (6.69%) | 22.4 V | 2.65 V (11.03%) | 401.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.2 V (5.02%) | 22.8 V | 1.99 V (8.27%) | 300.9 W | Drop High |
FAQ — 250 Amp Cable Size at 45 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 250A at 45 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 250A over 45m at 24V (voltage drop: 0.6V or 2.51%).
What is the power capacity of 250A at 24V?
At unity power factor, 250A at 24V supports 6.0 kW with a standard 250A circuit breaker.
Related Lengths & Currents (24V)
250A · 5m (24V)250A · 10m (24V)250A · 15m (24V)250A · 20m (24V)250A · 25m (24V)250A · 30m (24V)250A · 35m (24V)250A · 40m (24V)250A · 50m (24V)250A · 60m (24V)250A · 70m (24V)10A · 45m (24V)16A · 45m (24V)20A · 45m (24V)25A · 45m (24V)32A · 45m (24V)40A · 45m (24V)50A · 45m (24V)63A · 45m (24V)80A · 45m (24V)100A · 45m (24V)125A · 45m (24V)160A · 45m (24V)200A · 45m (24V)