325 Amp Cable Size at 25 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 325 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.43V (1.81%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.43V (5.98%)
Voltage at Load23.6 VLine Loss: 141.2 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 25m
| 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 | 231.83 V (965.97%) | 0.0 V | 382.42 V (1593.4%) | 75345.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 139.1 V (579.58%) | 0.0 V | 229.45 V (956.04%) | 45207.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 86.94 V (362.24%) | 0.0 V | 143.41 V (597.53%) | 28254.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 57.96 V (241.49%) | 0.0 V | 95.6 V (398.35%) | 18836.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 34.77 V (144.9%) | 0.0 V | 57.36 V (239.01%) | 11301.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 21.73 V (90.56%) | 2.3 V | 35.85 V (149.38%) | 7063.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 13.91 V (57.96%) | 10.1 V | 22.95 V (95.6%) | 4520.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 9.94 V (41.4%) | 14.1 V | 16.39 V (68.29%) | 3229.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 6.95 V (28.98%) | 17.0 V | 11.47 V (47.8%) | 2260.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.97 V (20.7%) | 19.0 V | 8.19 V (34.14%) | 1614.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.66 V (15.25%) | 20.3 V | 6.04 V (25.16%) | 1189.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.9 V (12.07%) | 21.1 V | 4.78 V (19.92%) | 941.8 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.32 V (9.66%) | 21.7 V | 3.82 V (15.93%) | 753.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.88 V (7.83%) | 22.1 V | 3.1 V (12.92%) | 610.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.45 V (6.04%) | 22.6 V | 2.39 V (9.96%) | 470.9 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.16 V (4.83%) | 22.8 V | 1.91 V (7.97%) | 376.7 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.87 V (3.62%) | 23.1 V | 1.43 V (5.98%) | 282.5 W | ~ ≤5% |
FAQ — 325 Amp Cable Size at 25 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 25 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 325A over 25m at 24V (voltage drop: 0.43V or 1.81%).
What is the power capacity of 325A at 24V?
At unity power factor, 325A at 24V supports 7.8 kW with a standard 350A circuit breaker.
Related Lengths & Currents (24V)
325A · 5m (24V)325A · 10m (24V)325A · 15m (24V)325A · 20m (24V)325A · 30m (24V)325A · 35m (24V)325A · 40m (24V)325A · 45m (24V)325A · 50m (24V)325A · 60m (24V)325A · 70m (24V)10A · 25m (24V)16A · 25m (24V)20A · 25m (24V)25A · 25m (24V)32A · 25m (24V)40A · 25m (24V)50A · 25m (24V)63A · 25m (24V)80A · 25m (24V)100A · 25m (24V)125A · 25m (24V)160A · 25m (24V)200A · 25m (24V)