90 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 90 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 0.64V (2.67%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 0.69V (2.86%)
Voltage at Load23.4 VLine Loss: 57.8 W
Max Power & Breaker2.16 kW90A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 90A 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 | 51.36 V (214.0%) | 0.0 V | 84.72 V (353.0%) | 4622.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 30.82 V (128.4%) | 0.0 V | 50.83 V (211.8%) | 2773.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 19.26 V (80.25%) | 4.7 V | 31.77 V (132.38%) | 1733.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.84 V (53.5%) | 11.2 V | 21.18 V (88.25%) | 1155.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 7.7 V (32.1%) | 16.3 V | 12.71 V (52.95%) | 693.4 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.81 V (20.06%) | 19.2 V | 7.94 V (33.09%) | 433.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.08 V (12.84%) | 20.9 V | 5.08 V (21.18%) | 277.3 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.2 V (9.17%) | 21.8 V | 3.63 V (15.13%) | 198.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 1.54 V (6.42%) | 22.5 V | 2.54 V (10.59%) | 138.7 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.1 V (4.59%) | 22.9 V | 1.82 V (7.56%) | 99.1 W | ~ ≤5% |
| 95 mm² | 232 A | 181 A | 0.81 V (3.38%) | 23.2 V | 1.34 V (5.57%) | 73.0 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 0.64 V (2.67%) | 23.4 V | 1.06 V (4.41%) | 57.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.51 V (2.14%) | 23.5 V | 0.85 V (3.53%) | 46.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.42 V (1.74%) | 23.6 V | 0.69 V (2.86%) | 37.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.32 V (1.34%) | 23.7 V | 0.53 V (2.21%) | 28.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.26 V (1.07%) | 23.7 V | 0.42 V (1.76%) | 23.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.8%) | 23.8 V | 0.32 V (1.32%) | 17.3 W | ✓ OK (≤3%) |
FAQ — 90 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 90A 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 90A over 20m at 24V (voltage drop: 0.64V or 2.67%).
What is the power capacity of 90A at 24V?
At unity power factor, 90A at 24V supports 2.16 kW with a standard 90A circuit breaker.
Related Lengths & Currents (24V)
90A · 5m (24V)90A · 10m (24V)90A · 15m (24V)90A · 25m (24V)90A · 30m (24V)90A · 35m (24V)90A · 40m (24V)90A · 45m (24V)90A · 50m (24V)90A · 60m (24V)90A · 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)80A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)