125 Amp Cable Size at 35 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 35 m (114.8 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 0.62V (2.6%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.77V (3.22%)
Voltage at Load23.4 VLine Loss: 78.0 W
Max Power & Breaker3.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 35m
| 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 | 124.83 V (520.14%) | 0.0 V | 205.92 V (857.99%) | 15604.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 74.9 V (312.08%) | 0.0 V | 123.55 V (514.79%) | 9362.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 46.81 V (195.05%) | 0.0 V | 77.22 V (321.74%) | 5851.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 31.21 V (130.03%) | 0.0 V | 51.48 V (214.5%) | 3901.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 18.72 V (78.02%) | 5.3 V | 30.89 V (128.7%) | 2340.6 W | Drop High |
| 16 mm² | 76 A | 59 A | 11.7 V (48.76%) | 12.3 V | 19.3 V (80.44%) | 1462.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 7.49 V (31.21%) | 16.5 V | 12.36 V (51.48%) | 936.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 5.35 V (22.29%) | 18.6 V | 8.82 V (36.77%) | 668.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 3.75 V (15.6%) | 20.3 V | 6.18 V (25.74%) | 468.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 2.67 V (11.15%) | 21.3 V | 4.41 V (18.39%) | 334.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.97 V (8.21%) | 22.0 V | 3.25 V (13.55%) | 246.4 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.56 V (6.5%) | 22.4 V | 2.57 V (10.72%) | 195.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.25 V (5.2%) | 22.8 V | 2.06 V (8.58%) | 156.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.01 V (4.22%) | 23.0 V | 1.67 V (6.96%) | 126.5 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 0.78 V (3.25%) | 23.2 V | 1.29 V (5.36%) | 97.5 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 0.62 V (2.6%) | 23.4 V | 1.03 V (4.29%) | 78.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.47 V (1.95%) | 23.5 V | 0.77 V (3.22%) | 58.5 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 35 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 125A at 35 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 125A over 35m at 24V (voltage drop: 0.62V or 2.6%).
What is the power capacity of 125A at 24V?
At unity power factor, 125A at 24V supports 3.0 kW with a standard 125A circuit breaker.
Related Lengths & Currents (24V)
125A · 5m (24V)125A · 10m (24V)125A · 15m (24V)125A · 20m (24V)125A · 25m (24V)125A · 30m (24V)125A · 40m (24V)125A · 45m (24V)125A · 50m (24V)125A · 60m (24V)125A · 70m (24V)10A · 35m (24V)16A · 35m (24V)20A · 35m (24V)25A · 35m (24V)32A · 35m (24V)40A · 35m (24V)50A · 35m (24V)63A · 35m (24V)80A · 35m (24V)100A · 35m (24V)160A · 35m (24V)200A · 35m (24V)