15 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 15 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 1.28V (2.67%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 1.32V (2.76%)
Voltage at Load46.7 VLine Loss: 19.3 W
Max Power & Breaker0.72 kW15A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 15A at 20m
| 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 | 8.56 V (17.83%) | 39.4 V | 14.12 V (29.42%) | 128.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 5.14 V (10.7%) | 42.9 V | 8.47 V (17.65%) | 77.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 3.21 V (6.69%) | 44.8 V | 5.29 V (11.03%) | 48.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 2.14 V (4.46%) | 45.9 V | 3.53 V (7.35%) | 32.1 W | ~ ≤5% |
| 10 mm² | 57 A | 44 A | 1.28 V (2.67%) | 46.7 V | 2.12 V (4.41%) | 19.3 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 0.8 V (1.67%) | 47.2 V | 1.32 V (2.76%) | 12.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.51 V (1.07%) | 47.5 V | 0.85 V (1.76%) | 7.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.37 V (0.76%) | 47.6 V | 0.61 V (1.26%) | 5.5 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.26 V (0.53%) | 47.7 V | 0.42 V (0.88%) | 3.9 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.18 V (0.38%) | 47.8 V | 0.3 V (0.63%) | 2.8 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.14 V (0.28%) | 47.9 V | 0.22 V (0.46%) | 2.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.11 V (0.22%) | 47.9 V | 0.18 V (0.37%) | 1.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.09 V (0.18%) | 47.9 V | 0.14 V (0.29%) | 1.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.07 V (0.14%) | 47.9 V | 0.11 V (0.24%) | 1.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.05 V (0.11%) | 47.9 V | 0.09 V (0.18%) | 0.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.04 V (0.09%) | 48.0 V | 0.07 V (0.15%) | 0.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.03 V (0.07%) | 48.0 V | 0.05 V (0.11%) | 0.5 W | ✓ OK (≤3%) |
FAQ — 15 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 15A at 20 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10 mm² copper cable for 15A over 20m at 48V (voltage drop: 1.28V or 2.67%).
What is the power capacity of 15A at 48V?
At unity power factor, 15A at 48V supports 0.72 kW with a standard 15A circuit breaker.
Related Lengths & Currents (48V)
15A · 5m (48V)15A · 10m (48V)15A · 15m (48V)15A · 25m (48V)15A · 30m (48V)15A · 35m (48V)15A · 40m (48V)15A · 45m (48V)15A · 50m (48V)15A · 60m (48V)15A · 70m (48V)10A · 20m (48V)16A · 20m (48V)20A · 20m (48V)25A · 20m (48V)32A · 20m (48V)40A · 20m (48V)50A · 20m (48V)63A · 20m (48V)80A · 20m (48V)100A · 20m (48V)125A · 20m (48V)160A · 20m (48V)200A · 20m (48V)