40 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 40 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)70 mm²Drop: 1.1V (2.29%)
Aluminum Cable (≤3% Drop)95 mm²Drop: 1.34V (2.79%)
Voltage at Load46.9 VLine Loss: 44.0 W
Max Power & Breaker1.92 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A 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 | 51.36 V (107.0%) | 0.0 V | 84.72 V (176.5%) | 2054.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 30.82 V (64.2%) | 17.2 V | 50.83 V (105.9%) | 1232.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 19.26 V (40.12%) | 28.7 V | 31.77 V (66.19%) | 770.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.84 V (26.75%) | 35.2 V | 21.18 V (44.12%) | 513.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 7.7 V (16.05%) | 40.3 V | 12.71 V (26.47%) | 308.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.81 V (10.03%) | 43.2 V | 7.94 V (16.55%) | 192.6 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.08 V (6.42%) | 44.9 V | 5.08 V (10.59%) | 123.3 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.2 V (4.59%) | 45.8 V | 3.63 V (7.56%) | 88.0 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 1.54 V (3.21%) | 46.5 V | 2.54 V (5.29%) | 61.6 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 1.1 V (2.29%) | 46.9 V | 1.82 V (3.78%) | 44.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.81 V (1.69%) | 47.2 V | 1.34 V (2.79%) | 32.4 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.64 V (1.34%) | 47.4 V | 1.06 V (2.21%) | 25.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.51 V (1.07%) | 47.5 V | 0.85 V (1.76%) | 20.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.42 V (0.87%) | 47.6 V | 0.69 V (1.43%) | 16.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.32 V (0.67%) | 47.7 V | 0.53 V (1.1%) | 12.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.26 V (0.53%) | 47.7 V | 0.42 V (0.88%) | 10.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.4%) | 47.8 V | 0.32 V (0.66%) | 7.7 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 45 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 40A at 45 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 40A over 45m at 48V (voltage drop: 1.1V or 2.29%).
What is the power capacity of 40A at 48V?
At unity power factor, 40A at 48V supports 1.92 kW with a standard 40A circuit breaker.
Related Lengths & Currents (48V)
40A · 5m (48V)40A · 10m (48V)40A · 15m (48V)40A · 20m (48V)40A · 25m (48V)40A · 30m (48V)40A · 35m (48V)40A · 40m (48V)40A · 50m (48V)40A · 60m (48V)40A · 70m (48V)10A · 45m (48V)16A · 45m (48V)20A · 45m (48V)25A · 45m (48V)32A · 45m (48V)50A · 45m (48V)63A · 45m (48V)80A · 45m (48V)100A · 45m (48V)125A · 45m (48V)160A · 45m (48V)200A · 45m (48V)