20 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 20 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 1.34V (2.79%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 1.41V (2.94%)
Voltage at Load46.7 VLine Loss: 26.7 W
Max Power & Breaker0.96 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A 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 | 14.27 V (29.72%) | 33.7 V | 23.53 V (49.03%) | 285.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 8.56 V (17.83%) | 39.4 V | 14.12 V (29.42%) | 171.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 5.35 V (11.15%) | 42.6 V | 8.82 V (18.39%) | 107.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 3.57 V (7.43%) | 44.4 V | 5.88 V (12.26%) | 71.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.14 V (4.46%) | 45.9 V | 3.53 V (7.35%) | 42.8 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 1.34 V (2.79%) | 46.7 V | 2.21 V (4.6%) | 26.7 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.86 V (1.78%) | 47.1 V | 1.41 V (2.94%) | 17.1 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.61 V (1.27%) | 47.4 V | 1.01 V (2.1%) | 12.2 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.43 V (0.89%) | 47.6 V | 0.71 V (1.47%) | 8.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.31 V (0.64%) | 47.7 V | 0.5 V (1.05%) | 6.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.23 V (0.47%) | 47.8 V | 0.37 V (0.77%) | 4.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.18 V (0.37%) | 47.8 V | 0.29 V (0.61%) | 3.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.14 V (0.3%) | 47.9 V | 0.24 V (0.49%) | 2.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.12 V (0.24%) | 47.9 V | 0.19 V (0.4%) | 2.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.09 V (0.19%) | 47.9 V | 0.15 V (0.31%) | 1.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.07 V (0.15%) | 47.9 V | 0.12 V (0.25%) | 1.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.05 V (0.11%) | 47.9 V | 0.09 V (0.18%) | 1.1 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 25 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 20A at 25 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 20A over 25m at 48V (voltage drop: 1.34V or 2.79%).
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 · 30m (48V)20A · 35m (48V)20A · 40m (48V)20A · 45m (48V)20A · 50m (48V)20A · 60m (48V)20A · 70m (48V)10A · 25m (48V)16A · 25m (48V)25A · 25m (48V)32A · 25m (48V)40A · 25m (48V)50A · 25m (48V)63A · 25m (48V)80A · 25m (48V)100A · 25m (48V)125A · 25m (48V)160A · 25m (48V)200A · 25m (48V)