100 Amp Cable Size at 40 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 100 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 0.71V (2.97%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.71V (2.94%)
Voltage at Load23.3 VLine Loss: 71.3 W
Max Power & Breaker2.4 kW100A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 100A at 40m
| 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 | 114.13 V (475.56%) | 0.0 V | 188.27 V (784.44%) | 11413.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 68.48 V (285.33%) | 0.0 V | 112.96 V (470.67%) | 6848.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 42.8 V (178.33%) | 0.0 V | 70.6 V (294.17%) | 4280.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 28.53 V (118.89%) | 0.0 V | 47.07 V (196.11%) | 2853.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 17.12 V (71.33%) | 6.9 V | 28.24 V (117.67%) | 1712.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 1070.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 6.85 V (28.53%) | 17.2 V | 11.3 V (47.07%) | 684.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 4.89 V (20.38%) | 19.1 V | 8.07 V (33.62%) | 489.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 3.42 V (14.27%) | 20.6 V | 5.65 V (23.53%) | 342.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 2.45 V (10.19%) | 21.6 V | 4.03 V (16.81%) | 244.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.8 V (7.51%) | 22.2 V | 2.97 V (12.39%) | 180.2 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.43 V (5.94%) | 22.6 V | 2.35 V (9.81%) | 142.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.14 V (4.76%) | 22.9 V | 1.88 V (7.84%) | 114.1 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 0.93 V (3.86%) | 23.1 V | 1.53 V (6.36%) | 92.5 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 0.71 V (2.97%) | 23.3 V | 1.18 V (4.9%) | 71.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.57 V (2.38%) | 23.4 V | 0.94 V (3.92%) | 57.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.43 V (1.78%) | 23.6 V | 0.71 V (2.94%) | 42.8 W | ✓ OK (≤3%) |
FAQ — 100 Amp Cable Size at 40 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 100A at 40 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 100A over 40m at 24V (voltage drop: 0.71V or 2.97%).
What is the power capacity of 100A at 24V?
At unity power factor, 100A at 24V supports 2.4 kW with a standard 100A circuit breaker.
Related Lengths & Currents (24V)
100A · 5m (24V)100A · 10m (24V)100A · 15m (24V)100A · 20m (24V)100A · 25m (24V)100A · 30m (24V)100A · 35m (24V)100A · 45m (24V)100A · 50m (24V)100A · 60m (24V)100A · 70m (24V)10A · 40m (24V)16A · 40m (24V)20A · 40m (24V)25A · 40m (24V)32A · 40m (24V)40A · 40m (24V)50A · 40m (24V)63A · 40m (24V)80A · 40m (24V)125A · 40m (24V)160A · 40m (24V)200A · 40m (24V)