300 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 300 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 1.39V (2.89%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 1.41V (2.94%)
Voltage at Load46.6 VLine Loss: 416.4 W
Max Power & Breaker14.4 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A 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 | 171.2 V (356.67%) | 0.0 V | 282.4 V (588.33%) | 51360.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 102.72 V (214.0%) | 0.0 V | 169.44 V (353.0%) | 30816.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 64.2 V (133.75%) | 0.0 V | 105.9 V (220.62%) | 19260.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 42.8 V (89.17%) | 5.2 V | 70.6 V (147.08%) | 12840.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 25.68 V (53.5%) | 22.3 V | 42.36 V (88.25%) | 7704.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 16.05 V (33.44%) | 31.9 V | 26.47 V (55.16%) | 4815.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 10.27 V (21.4%) | 37.7 V | 16.94 V (35.3%) | 3081.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 7.34 V (15.29%) | 40.7 V | 12.1 V (25.21%) | 2201.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 5.14 V (10.7%) | 42.9 V | 8.47 V (17.65%) | 1540.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.67 V (7.64%) | 44.3 V | 6.05 V (12.61%) | 1100.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.7 V (5.63%) | 45.3 V | 4.46 V (9.29%) | 810.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.14 V (4.46%) | 45.9 V | 3.53 V (7.35%) | 642.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.71 V (3.57%) | 46.3 V | 2.82 V (5.88%) | 513.6 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 1.39 V (2.89%) | 46.6 V | 2.29 V (4.77%) | 416.4 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.07 V (2.23%) | 46.9 V | 1.76 V (3.68%) | 321.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.86 V (1.78%) | 47.1 V | 1.41 V (2.94%) | 256.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.64 V (1.34%) | 47.4 V | 1.06 V (2.21%) | 192.6 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 300A at 20 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 185 mm² copper cable for 300A over 20m at 48V (voltage drop: 1.39V or 2.89%).
What is the power capacity of 300A at 48V?
At unity power factor, 300A at 48V supports 14.4 kW with a standard 300A circuit breaker.
Related Lengths & Currents (48V)
300A · 5m (48V)300A · 10m (48V)300A · 15m (48V)300A · 25m (48V)300A · 30m (48V)300A · 35m (48V)300A · 40m (48V)300A · 45m (48V)300A · 50m (48V)300A · 60m (48V)300A · 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)