125 Amp Cable Size at 15 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 15 m (49.2 ft).
Copper Cable (≤3% Drop)70 mm²Drop: 1.15V (2.39%)
Aluminum Cable (≤3% Drop)95 mm²Drop: 1.39V (2.9%)
Voltage at Load46.9 VLine Loss: 143.3 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 15m
| 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 | 53.5 V (111.46%) | 0.0 V | 88.25 V (183.85%) | 6687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 32.1 V (66.88%) | 15.9 V | 52.95 V (110.31%) | 4012.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 20.06 V (41.8%) | 27.9 V | 33.09 V (68.95%) | 2507.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 13.38 V (27.86%) | 34.6 V | 22.06 V (45.96%) | 1671.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 8.03 V (16.72%) | 40.0 V | 13.24 V (27.58%) | 1003.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 5.02 V (10.45%) | 43.0 V | 8.27 V (17.24%) | 627.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.21 V (6.69%) | 44.8 V | 5.29 V (11.03%) | 401.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.29 V (4.78%) | 45.7 V | 3.78 V (7.88%) | 286.6 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 1.6 V (3.34%) | 46.4 V | 2.65 V (5.52%) | 200.6 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 1.15 V (2.39%) | 46.9 V | 1.89 V (3.94%) | 143.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.84 V (1.76%) | 47.2 V | 1.39 V (2.9%) | 105.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.67 V (1.39%) | 47.3 V | 1.1 V (2.3%) | 83.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.54 V (1.11%) | 47.5 V | 0.88 V (1.84%) | 66.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.43 V (0.9%) | 47.6 V | 0.72 V (1.49%) | 54.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.33 V (0.7%) | 47.7 V | 0.55 V (1.15%) | 41.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.27 V (0.56%) | 47.7 V | 0.44 V (0.92%) | 33.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.2 V (0.42%) | 47.8 V | 0.33 V (0.69%) | 25.1 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 15 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 15 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 125A over 15m at 48V (voltage drop: 1.15V or 2.39%).
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 · 20m (48V)125A · 25m (48V)125A · 30m (48V)125A · 35m (48V)125A · 40m (48V)125A · 45m (48V)125A · 50m (48V)125A · 60m (48V)125A · 70m (48V)10A · 15m (48V)16A · 15m (48V)20A · 15m (48V)25A · 15m (48V)32A · 15m (48V)40A · 15m (48V)50A · 15m (48V)63A · 15m (48V)80A · 15m (48V)100A · 15m (48V)160A · 15m (48V)200A · 15m (48V)