325 Amp Cable Size at 20 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 20 m (65.6 ft).
Copper Cable (≤3% Drop)400 mm²Drop: 0.7V (2.9%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.15V (4.78%)
Voltage at Load23.3 VLine Loss: 226.0 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 20m
| 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 | 185.47 V (772.78%) | 0.0 V | 305.93 V (1274.72%) | 60276.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 111.28 V (463.67%) | 0.0 V | 183.56 V (764.83%) | 36166.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 69.55 V (289.79%) | 0.0 V | 114.72 V (478.02%) | 22603.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 46.37 V (193.19%) | 0.0 V | 76.48 V (318.68%) | 15069.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 27.82 V (115.92%) | 0.0 V | 45.89 V (191.21%) | 9041.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 17.39 V (72.45%) | 6.6 V | 28.68 V (119.51%) | 5650.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 11.13 V (46.37%) | 12.9 V | 18.36 V (76.48%) | 3616.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 7.95 V (33.12%) | 16.1 V | 13.11 V (54.63%) | 2583.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 5.56 V (23.18%) | 18.4 V | 9.18 V (38.24%) | 1808.3 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.97 V (16.56%) | 20.0 V | 6.56 V (27.32%) | 1291.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.93 V (12.2%) | 21.1 V | 4.83 V (20.13%) | 951.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.32 V (9.66%) | 21.7 V | 3.82 V (15.93%) | 753.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.85 V (7.73%) | 22.1 V | 3.06 V (12.75%) | 602.8 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.5 V (6.27%) | 22.5 V | 2.48 V (10.34%) | 488.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.16 V (4.83%) | 22.8 V | 1.91 V (7.97%) | 376.7 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 0.93 V (3.86%) | 23.1 V | 1.53 V (6.37%) | 301.4 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 0.7 V (2.9%) | 23.3 V | 1.15 V (4.78%) | 226.0 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 400 mm² copper cable for 325A over 20m at 24V (voltage drop: 0.7V or 2.9%).
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 · 25m (24V)325A · 30m (24V)325A · 35m (24V)325A · 40m (24V)325A · 45m (24V)325A · 50m (24V)325A · 60m (24V)325A · 70m (24V)10A · 20m (24V)16A · 20m (24V)20A · 20m (24V)25A · 20m (24V)32A · 20m (24V)40A · 20m (24V)50A · 20m (24V)63A · 20m (24V)80A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)