25 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 25 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.1V (4.6%)
Voltage at Load23.3 VLine Loss: 16.7 W
Max Power & Breaker0.6 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A 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 | 178.33 V (743.06%) | 0.0 V | 294.17 V (1225.69%) | 4458.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 107.0 V (445.83%) | 0.0 V | 176.5 V (735.42%) | 2675.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 66.88 V (278.65%) | 0.0 V | 110.31 V (459.64%) | 1671.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 44.58 V (185.76%) | 0.0 V | 73.54 V (306.42%) | 1114.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 26.75 V (111.46%) | 0.0 V | 44.12 V (183.85%) | 668.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 16.72 V (69.66%) | 7.3 V | 27.58 V (114.91%) | 418.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 267.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 7.64 V (31.85%) | 16.4 V | 12.61 V (52.53%) | 191.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 5.35 V (22.29%) | 18.6 V | 8.82 V (36.77%) | 133.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.82 V (15.92%) | 20.2 V | 6.3 V (26.26%) | 95.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.82 V (11.73%) | 21.2 V | 4.64 V (19.35%) | 70.4 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.23 V (9.29%) | 21.8 V | 3.68 V (15.32%) | 55.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.78 V (7.43%) | 22.2 V | 2.94 V (12.26%) | 44.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.45 V (6.02%) | 22.6 V | 2.39 V (9.94%) | 36.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.11 V (4.64%) | 22.9 V | 1.84 V (7.66%) | 27.9 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 0.89 V (3.72%) | 23.1 V | 1.47 V (6.13%) | 22.3 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.67 V (2.79%) | 23.3 V | 1.1 V (4.6%) | 16.7 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 25A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 400 mm² copper cable for 25A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 25A at 24V?
At unity power factor, 25A at 24V supports 0.6 kW with a standard 25A circuit breaker.
Related Lengths & Currents (24V)
25A · 5m (24V)25A · 10m (24V)25A · 15m (24V)25A · 20m (24V)25A · 25m (24V)25A · 30m (24V)25A · 35m (24V)25A · 40m (24V)25A · 45m (24V)25A · 50m (24V)25A · 60m (24V)25A · 70m (24V)10A · 250m (24V)16A · 250m (24V)20A · 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)