30 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 30 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 1.03V (2.14%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 1.21V (2.52%)
Voltage at Load47.0 VLine Loss: 30.8 W
Max Power & Breaker1.44 kW30A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 30A 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 | 17.12 V (35.67%) | 30.9 V | 28.24 V (58.83%) | 513.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 10.27 V (21.4%) | 37.7 V | 16.94 V (35.3%) | 308.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 6.42 V (13.38%) | 41.6 V | 10.59 V (22.06%) | 192.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 4.28 V (8.92%) | 43.7 V | 7.06 V (14.71%) | 128.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.57 V (5.35%) | 45.4 V | 4.24 V (8.82%) | 77.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.6 V (3.34%) | 46.4 V | 2.65 V (5.52%) | 48.1 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 1.03 V (2.14%) | 47.0 V | 1.69 V (3.53%) | 30.8 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.73 V (1.53%) | 47.3 V | 1.21 V (2.52%) | 22.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.51 V (1.07%) | 47.5 V | 0.85 V (1.76%) | 15.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.37 V (0.76%) | 47.6 V | 0.61 V (1.26%) | 11.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.27 V (0.56%) | 47.7 V | 0.45 V (0.93%) | 8.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.21 V (0.45%) | 47.8 V | 0.35 V (0.74%) | 6.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.17 V (0.36%) | 47.8 V | 0.28 V (0.59%) | 5.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.14 V (0.29%) | 47.9 V | 0.23 V (0.48%) | 4.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.11 V (0.22%) | 47.9 V | 0.18 V (0.37%) | 3.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.09 V (0.18%) | 47.9 V | 0.14 V (0.29%) | 2.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.06 V (0.13%) | 47.9 V | 0.11 V (0.22%) | 1.9 W | ✓ OK (≤3%) |
FAQ — 30 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 30A 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 30A over 20m at 48V (voltage drop: 1.03V or 2.14%).
What is the power capacity of 30A at 48V?
At unity power factor, 30A at 48V supports 1.44 kW with a standard 30A circuit breaker.
Related Lengths & Currents (48V)
30A · 5m (48V)30A · 10m (48V)30A · 15m (48V)30A · 25m (48V)30A · 30m (48V)30A · 35m (48V)30A · 40m (48V)30A · 45m (48V)30A · 50m (48V)30A · 60m (48V)30A · 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)