900 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 900 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)3× 400 mm²Drop: 0.64V (2.68%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 3.18V (13.24%)
Voltage at Load23.4 VLine Loss: 577.8 W
Max Power & Breaker21.6 kW1000A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 900A 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 | 513.6 V (2140.0%) | 0.0 V | 847.2 V (3530.0%) | 462240.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 308.16 V (1284.0%) | 0.0 V | 508.32 V (2118.0%) | 277344.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 192.6 V (802.5%) | 0.0 V | 317.7 V (1323.75%) | 173340.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 128.4 V (535.0%) | 0.0 V | 211.8 V (882.5%) | 115560.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 77.04 V (321.0%) | 0.0 V | 127.08 V (529.5%) | 69336.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 48.15 V (200.62%) | 0.0 V | 79.42 V (330.94%) | 43335.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 30.82 V (128.4%) | 0.0 V | 50.83 V (211.8%) | 27734.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 22.01 V (91.71%) | 2.0 V | 36.31 V (151.29%) | 19810.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 15.41 V (64.2%) | 8.6 V | 25.42 V (105.9%) | 13867.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 11.01 V (45.86%) | 13.0 V | 18.15 V (75.64%) | 9905.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 8.11 V (33.79%) | 15.9 V | 13.38 V (55.74%) | 7298.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 6.42 V (26.75%) | 17.6 V | 10.59 V (44.12%) | 5778.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 5.14 V (21.4%) | 18.9 V | 8.47 V (35.3%) | 4622.4 W | Drop High |
| 185 mm² | 353 A | 275 A | 4.16 V (17.35%) | 19.8 V | 6.87 V (28.62%) | 3747.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 3.21 V (13.38%) | 20.8 V | 5.29 V (22.06%) | 2889.0 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.57 V (10.7%) | 21.4 V | 4.24 V (17.65%) | 2311.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.93 V (8.03%) | 22.1 V | 3.18 V (13.24%) | 1733.4 W | Drop High |
FAQ — 900 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 900A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 3× 400 mm² copper cable for 900A over 20m at 24V (voltage drop: 0.64V or 2.68%).
What is the power capacity of 900A at 24V?
At unity power factor, 900A at 24V supports 21.6 kW with a standard 1000A circuit breaker.
Related Lengths & Currents (24V)
900A · 5m (24V)900A · 10m (24V)900A · 15m (24V)900A · 25m (24V)900A · 30m (24V)900A · 35m (24V)900A · 40m (24V)900A · 45m (24V)900A · 50m (24V)900A · 60m (24V)900A · 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)