25 Amp Cable Size at 15 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 25 A over 15 m (49.2 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 0.64V (2.67%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 0.53V (2.21%)
Voltage at Load23.4 VLine Loss: 16.1 W
Max Power & Breaker0.6 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A at 15m
| 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 | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 267.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 6.42 V (26.75%) | 17.6 V | 10.59 V (44.12%) | 160.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 4.01 V (16.72%) | 20.0 V | 6.62 V (27.58%) | 100.3 W | Drop High |
| 6 mm² | 41 A | 32 A | 2.67 V (11.15%) | 21.3 V | 4.41 V (18.39%) | 66.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 1.61 V (6.69%) | 22.4 V | 2.65 V (11.03%) | 40.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.0 V (4.18%) | 23.0 V | 1.65 V (6.89%) | 25.1 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 0.64 V (2.67%) | 23.4 V | 1.06 V (4.41%) | 16.1 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.46 V (1.91%) | 23.5 V | 0.76 V (3.15%) | 11.5 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.32 V (1.34%) | 23.7 V | 0.53 V (2.21%) | 8.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.23 V (0.96%) | 23.8 V | 0.38 V (1.58%) | 5.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.17 V (0.7%) | 23.8 V | 0.28 V (1.16%) | 4.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.13 V (0.56%) | 23.9 V | 0.22 V (0.92%) | 3.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.11 V (0.45%) | 23.9 V | 0.18 V (0.74%) | 2.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.09 V (0.36%) | 23.9 V | 0.14 V (0.6%) | 2.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.07 V (0.28%) | 23.9 V | 0.11 V (0.46%) | 1.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.05 V (0.22%) | 23.9 V | 0.09 V (0.37%) | 1.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.04 V (0.17%) | 24.0 V | 0.07 V (0.28%) | 1.0 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 15 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 25A at 15 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 25A over 15m at 24V (voltage drop: 0.64V or 2.67%).
What is the power capacity of 25A at 24V?
At unity power factor, 25A at 24V supports 0.6 kW with a standard 25A circuit breaker.
Related Lengths & Currents (24V)
25A · 5m (24V)25A · 10m (24V)25A · 20m (24V)25A · 25m (24V)25A · 30m (24V)25A · 35m (24V)25A · 40m (24V)25A · 45m (24V)25A · 50m (24V)25A · 60m (24V)25A · 70m (24V)10A · 15m (24V)16A · 15m (24V)20A · 15m (24V)32A · 15m (24V)40A · 15m (24V)50A · 15m (24V)63A · 15m (24V)80A · 15m (24V)100A · 15m (24V)125A · 15m (24V)160A · 15m (24V)200A · 15m (24V)