125 Amp Cable Size at 25 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 25 m (82.0 ft).
Copper Cable (≤3% Drop)95 mm²Drop: 1.41V (2.93%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 1.19V (2.48%)
Voltage at Load46.6 VLine Loss: 176.0 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A 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 | 89.17 V (185.76%) | 0.0 V | 147.08 V (306.42%) | 11145.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 53.5 V (111.46%) | 0.0 V | 88.25 V (183.85%) | 6687.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 33.44 V (69.66%) | 14.6 V | 55.16 V (114.91%) | 4179.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 22.29 V (46.44%) | 25.7 V | 36.77 V (76.61%) | 2786.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.37 V (27.86%) | 34.6 V | 22.06 V (45.96%) | 1671.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 8.36 V (17.42%) | 39.6 V | 13.79 V (28.73%) | 1044.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 5.35 V (11.15%) | 42.6 V | 8.82 V (18.39%) | 668.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 3.82 V (7.96%) | 44.2 V | 6.3 V (13.13%) | 477.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 2.67 V (5.57%) | 45.3 V | 4.41 V (9.19%) | 334.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.91 V (3.98%) | 46.1 V | 3.15 V (6.57%) | 238.8 W | ~ ≤5% |
| 95 mm² | 232 A | 181 A | 1.41 V (2.93%) | 46.6 V | 2.32 V (4.84%) | 176.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.11 V (2.32%) | 46.9 V | 1.84 V (3.83%) | 139.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.89 V (1.86%) | 47.1 V | 1.47 V (3.06%) | 111.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.72 V (1.51%) | 47.3 V | 1.19 V (2.48%) | 90.4 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.56 V (1.16%) | 47.4 V | 0.92 V (1.92%) | 69.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.45 V (0.93%) | 47.6 V | 0.74 V (1.53%) | 55.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.33 V (0.7%) | 47.7 V | 0.55 V (1.15%) | 41.8 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 25 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 25 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 95 mm² copper cable for 125A over 25m at 48V (voltage drop: 1.41V or 2.93%).
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 · 30m (48V)125A · 35m (48V)125A · 40m (48V)125A · 45m (48V)125A · 50m (48V)125A · 60m (48V)125A · 70m (48V)10A · 25m (48V)16A · 25m (48V)20A · 25m (48V)25A · 25m (48V)32A · 25m (48V)40A · 25m (48V)50A · 25m (48V)63A · 25m (48V)80A · 25m (48V)100A · 25m (48V)160A · 25m (48V)200A · 25m (48V)