50 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 50 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)70 mm²Drop: 0.61V (2.55%)
Aluminum Cable (≤3% Drop)120 mm²Drop: 0.59V (2.45%)
Voltage at Load23.4 VLine Loss: 30.6 W
Max Power & Breaker1.2 kW50A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 50A 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 | 28.53 V (118.89%) | 0.0 V | 47.07 V (196.11%) | 1426.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 17.12 V (71.33%) | 6.9 V | 28.24 V (117.67%) | 856.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 535.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 7.13 V (29.72%) | 16.9 V | 11.77 V (49.03%) | 356.7 W | Drop High |
| 10 mm² | 57 A | 44 A | 4.28 V (17.83%) | 19.7 V | 7.06 V (29.42%) | 214.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 2.67 V (11.15%) | 21.3 V | 4.41 V (18.39%) | 133.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.71 V (7.13%) | 22.3 V | 2.82 V (11.77%) | 85.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 1.22 V (5.1%) | 22.8 V | 2.02 V (8.4%) | 61.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 0.86 V (3.57%) | 23.1 V | 1.41 V (5.88%) | 42.8 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 0.61 V (2.55%) | 23.4 V | 1.01 V (4.2%) | 30.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.45 V (1.88%) | 23.5 V | 0.74 V (3.1%) | 22.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.36 V (1.49%) | 23.6 V | 0.59 V (2.45%) | 17.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.29 V (1.19%) | 23.7 V | 0.47 V (1.96%) | 14.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.23 V (0.96%) | 23.8 V | 0.38 V (1.59%) | 11.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.18 V (0.74%) | 23.8 V | 0.29 V (1.23%) | 8.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.14 V (0.59%) | 23.9 V | 0.24 V (0.98%) | 7.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.11 V (0.45%) | 23.9 V | 0.18 V (0.74%) | 5.3 W | ✓ OK (≤3%) |
FAQ — 50 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 50A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 50A over 20m at 24V (voltage drop: 0.61V or 2.55%).
What is the power capacity of 50A at 24V?
At unity power factor, 50A at 24V supports 1.2 kW with a standard 50A circuit breaker.
Related Lengths & Currents (24V)
50A · 5m (24V)50A · 10m (24V)50A · 15m (24V)50A · 25m (24V)50A · 30m (24V)50A · 35m (24V)50A · 40m (24V)50A · 45m (24V)50A · 50m (24V)50A · 60m (24V)50A · 70m (24V)10A · 20m (24V)16A · 20m (24V)20A · 20m (24V)25A · 20m (24V)32A · 20m (24V)40A · 20m (24V)63A · 20m (24V)80A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)