80 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 80 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 0.57V (2.38%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 0.61V (2.54%)
Voltage at Load23.4 VLine Loss: 45.7 W
Max Power & Breaker1.92 kW80A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 80A 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 | 45.65 V (190.22%) | 0.0 V | 75.31 V (313.78%) | 3652.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 27.39 V (114.13%) | 0.0 V | 45.18 V (188.27%) | 2191.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 17.12 V (71.33%) | 6.9 V | 28.24 V (117.67%) | 1369.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 11.41 V (47.56%) | 12.6 V | 18.83 V (78.44%) | 913.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 6.85 V (28.53%) | 17.2 V | 11.3 V (47.07%) | 547.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.28 V (17.83%) | 19.7 V | 7.06 V (29.42%) | 342.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 2.74 V (11.41%) | 21.3 V | 4.52 V (18.83%) | 219.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 1.96 V (8.15%) | 22.0 V | 3.23 V (13.45%) | 156.5 W | Drop High |
| 50 mm² | 151 A | 118 A | 1.37 V (5.71%) | 22.6 V | 2.26 V (9.41%) | 109.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 0.98 V (4.08%) | 23.0 V | 1.61 V (6.72%) | 78.3 W | ~ ≤5% |
| 95 mm² | 232 A | 181 A | 0.72 V (3.0%) | 23.3 V | 1.19 V (4.95%) | 57.7 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 0.57 V (2.38%) | 23.4 V | 0.94 V (3.92%) | 45.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.46 V (1.9%) | 23.5 V | 0.75 V (3.14%) | 36.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.37 V (1.54%) | 23.6 V | 0.61 V (2.54%) | 29.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.29 V (1.19%) | 23.7 V | 0.47 V (1.96%) | 22.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.23 V (0.95%) | 23.8 V | 0.38 V (1.57%) | 18.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.17 V (0.71%) | 23.8 V | 0.28 V (1.18%) | 13.7 W | ✓ OK (≤3%) |
FAQ — 80 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 80A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 120 mm² copper cable for 80A over 20m at 24V (voltage drop: 0.57V or 2.38%).
What is the power capacity of 80A at 24V?
At unity power factor, 80A at 24V supports 1.92 kW with a standard 80A circuit breaker.
Related Lengths & Currents (24V)
80A · 5m (24V)80A · 10m (24V)80A · 15m (24V)80A · 25m (24V)80A · 30m (24V)80A · 35m (24V)80A · 40m (24V)80A · 45m (24V)80A · 50m (24V)80A · 60m (24V)80A · 70m (24V)10A · 20m (24V)16A · 20m (24V)20A · 20m (24V)25A · 20m (24V)32A · 20m (24V)40A · 20m (24V)50A · 20m (24V)63A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)