20 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 20 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 1.1V (2.29%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 1.27V (2.65%)
Voltage at Load46.9 VLine Loss: 22.0 W
Max Power & Breaker0.96 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A 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 | 25.68 V (53.5%) | 22.3 V | 42.36 V (88.25%) | 513.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 15.41 V (32.1%) | 32.6 V | 25.42 V (52.95%) | 308.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 9.63 V (20.06%) | 38.4 V | 15.88 V (33.09%) | 192.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 6.42 V (13.38%) | 41.6 V | 10.59 V (22.06%) | 128.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 3.85 V (8.03%) | 44.1 V | 6.35 V (13.24%) | 77.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 2.41 V (5.02%) | 45.6 V | 3.97 V (8.27%) | 48.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.54 V (3.21%) | 46.5 V | 2.54 V (5.29%) | 30.8 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 1.1 V (2.29%) | 46.9 V | 1.82 V (3.78%) | 22.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.77 V (1.6%) | 47.2 V | 1.27 V (2.65%) | 15.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.55 V (1.15%) | 47.4 V | 0.91 V (1.89%) | 11.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.41 V (0.84%) | 47.6 V | 0.67 V (1.39%) | 8.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.32 V (0.67%) | 47.7 V | 0.53 V (1.1%) | 6.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.26 V (0.53%) | 47.7 V | 0.42 V (0.88%) | 5.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.21 V (0.43%) | 47.8 V | 0.34 V (0.72%) | 4.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.16 V (0.33%) | 47.8 V | 0.26 V (0.55%) | 3.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.13 V (0.27%) | 47.9 V | 0.21 V (0.44%) | 2.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.1 V (0.2%) | 47.9 V | 0.16 V (0.33%) | 1.9 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 45 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 20A at 45 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 20A over 45m at 48V (voltage drop: 1.1V or 2.29%).
What is the power capacity of 20A at 48V?
At unity power factor, 20A at 48V supports 0.96 kW with a standard 20A circuit breaker.
Related Lengths & Currents (48V)
20A · 5m (48V)20A · 10m (48V)20A · 15m (48V)20A · 20m (48V)20A · 25m (48V)20A · 30m (48V)20A · 35m (48V)20A · 40m (48V)20A · 50m (48V)20A · 60m (48V)20A · 70m (48V)10A · 45m (48V)16A · 45m (48V)25A · 45m (48V)32A · 45m (48V)40A · 45m (48V)50A · 45m (48V)63A · 45m (48V)80A · 45m (48V)100A · 45m (48V)125A · 45m (48V)160A · 45m (48V)200A · 45m (48V)