125 Amp Cable Size at 45 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 1.3V (2.71%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 1.32V (2.76%)
Voltage at Load46.7 VLine Loss: 162.7 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A 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 | 160.5 V (334.38%) | 0.0 V | 264.75 V (551.56%) | 20062.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 96.3 V (200.62%) | 0.0 V | 158.85 V (330.94%) | 12037.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 60.19 V (125.39%) | 0.0 V | 99.28 V (206.84%) | 7523.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 40.12 V (83.59%) | 7.9 V | 66.19 V (137.89%) | 5015.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 24.07 V (50.16%) | 23.9 V | 39.71 V (82.73%) | 3009.4 W | Drop High |
| 16 mm² | 76 A | 59 A | 15.05 V (31.35%) | 33.0 V | 24.82 V (51.71%) | 1880.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 9.63 V (20.06%) | 38.4 V | 15.88 V (33.09%) | 1203.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.88 V (14.33%) | 41.1 V | 11.35 V (23.64%) | 859.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 4.81 V (10.03%) | 43.2 V | 7.94 V (16.55%) | 601.9 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.44 V (7.17%) | 44.6 V | 5.67 V (11.82%) | 429.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.53 V (5.28%) | 45.5 V | 4.18 V (8.71%) | 316.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.01 V (4.18%) | 46.0 V | 3.31 V (6.89%) | 250.8 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 1.6 V (3.34%) | 46.4 V | 2.65 V (5.52%) | 200.6 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 1.3 V (2.71%) | 46.7 V | 2.15 V (4.47%) | 162.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.0 V (2.09%) | 47.0 V | 1.65 V (3.45%) | 125.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.8 V (1.67%) | 47.2 V | 1.32 V (2.76%) | 100.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.6 V (1.25%) | 47.4 V | 0.99 V (2.07%) | 75.2 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 45 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 45 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 185 mm² copper cable for 125A over 45m at 48V (voltage drop: 1.3V or 2.71%).
What is the power capacity of 125A at 48V?
At unity power factor, 125A at 48V supports 6.0 kW with a standard 125A circuit breaker.
Related Lengths & Currents (48V)
125A · 5m (48V)125A · 10m (48V)125A · 15m (48V)125A · 20m (48V)125A · 25m (48V)125A · 30m (48V)125A · 35m (48V)125A · 40m (48V)125A · 50m (48V)125A · 60m (48V)125A · 70m (48V)10A · 45m (48V)16A · 45m (48V)20A · 45m (48V)25A · 45m (48V)32A · 45m (48V)40A · 45m (48V)50A · 45m (48V)63A · 45m (48V)80A · 45m (48V)100A · 45m (48V)160A · 45m (48V)200A · 45m (48V)