35 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 35 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 1.2V (2.5%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 1.41V (2.94%)
Voltage at Load46.8 VLine Loss: 41.9 W
Max Power & Breaker1.68 kW35A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 35A 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 | 19.97 V (41.61%) | 28.0 V | 32.95 V (68.64%) | 699.1 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 11.98 V (24.97%) | 36.0 V | 19.77 V (41.18%) | 419.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 7.49 V (15.6%) | 40.5 V | 12.35 V (25.74%) | 262.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 4.99 V (10.4%) | 43.0 V | 8.24 V (17.16%) | 174.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 3.0 V (6.24%) | 45.0 V | 4.94 V (10.3%) | 104.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.87 V (3.9%) | 46.1 V | 3.09 V (6.43%) | 65.5 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 1.2 V (2.5%) | 46.8 V | 1.98 V (4.12%) | 41.9 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.86 V (1.78%) | 47.1 V | 1.41 V (2.94%) | 30.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.6 V (1.25%) | 47.4 V | 0.99 V (2.06%) | 21.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.43 V (0.89%) | 47.6 V | 0.71 V (1.47%) | 15.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.32 V (0.66%) | 47.7 V | 0.52 V (1.08%) | 11.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.25 V (0.52%) | 47.8 V | 0.41 V (0.86%) | 8.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.2 V (0.42%) | 47.8 V | 0.33 V (0.69%) | 7.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.16 V (0.34%) | 47.8 V | 0.27 V (0.56%) | 5.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.12 V (0.26%) | 47.9 V | 0.21 V (0.43%) | 4.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.1 V (0.21%) | 47.9 V | 0.16 V (0.34%) | 3.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.07 V (0.16%) | 47.9 V | 0.12 V (0.26%) | 2.6 W | ✓ OK (≤3%) |
FAQ — 35 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 35A at 20 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 35A over 20m at 48V (voltage drop: 1.2V or 2.5%).
What is the power capacity of 35A at 48V?
At unity power factor, 35A at 48V supports 1.68 kW with a standard 35A circuit breaker.
Related Lengths & Currents (48V)
35A · 5m (48V)35A · 10m (48V)35A · 15m (48V)35A · 25m (48V)35A · 30m (48V)35A · 35m (48V)35A · 40m (48V)35A · 45m (48V)35A · 50m (48V)35A · 60m (48V)35A · 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)