20 Amp Cable Size at 100 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 20 A over 100 m (328.1 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 0.71V (2.97%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 0.59V (2.45%)
Voltage at Load23.3 VLine Loss: 14.3 W
Max Power & Breaker0.48 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A at 100m
| 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 | 57.07 V (237.78%) | 0.0 V | 94.13 V (392.22%) | 1141.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 34.24 V (142.67%) | 0.0 V | 56.48 V (235.33%) | 684.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 21.4 V (89.17%) | 2.6 V | 35.3 V (147.08%) | 428.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 14.27 V (59.44%) | 9.7 V | 23.53 V (98.06%) | 285.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 8.56 V (35.67%) | 15.4 V | 14.12 V (58.83%) | 171.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 5.35 V (22.29%) | 18.6 V | 8.82 V (36.77%) | 107.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.42 V (14.27%) | 20.6 V | 5.65 V (23.53%) | 68.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.45 V (10.19%) | 21.6 V | 4.03 V (16.81%) | 48.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 1.71 V (7.13%) | 22.3 V | 2.82 V (11.77%) | 34.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.22 V (5.1%) | 22.8 V | 2.02 V (8.4%) | 24.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 0.9 V (3.75%) | 23.1 V | 1.49 V (6.19%) | 18.0 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 0.71 V (2.97%) | 23.3 V | 1.18 V (4.9%) | 14.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.57 V (2.38%) | 23.4 V | 0.94 V (3.92%) | 11.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.46 V (1.93%) | 23.5 V | 0.76 V (3.18%) | 9.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.36 V (1.49%) | 23.6 V | 0.59 V (2.45%) | 7.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.29 V (1.19%) | 23.7 V | 0.47 V (1.96%) | 5.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.21 V (0.89%) | 23.8 V | 0.35 V (1.47%) | 4.3 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 100 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 20A at 100 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 120 mm² copper cable for 20A over 100m at 24V (voltage drop: 0.71V or 2.97%).
What is the power capacity of 20A at 24V?
At unity power factor, 20A at 24V supports 0.48 kW with a standard 20A circuit breaker.
Related Lengths & Currents (24V)
20A · 5m (24V)20A · 10m (24V)20A · 15m (24V)20A · 20m (24V)20A · 25m (24V)20A · 30m (24V)20A · 35m (24V)20A · 40m (24V)20A · 45m (24V)20A · 50m (24V)20A · 60m (24V)20A · 70m (24V)10A · 100m (24V)16A · 100m (24V)25A · 100m (24V)32A · 100m (24V)40A · 100m (24V)50A · 100m (24V)63A · 100m (24V)80A · 100m (24V)100A · 100m (24V)125A · 100m (24V)160A · 100m (24V)200A · 100m (24V)