🔍 How much power does a 3 HP compressor consume?
A 3 HP (horsepower) motor is equivalent to about 2.2 kW of mechanical power. But that's not all:
Estimated electrical consumption: between 2.5 y 2.8 kW, considering engine efficiency.
Starting peak: can be between 2 and 3 times more than the rated power, i.e. up to 7.5 kW for a few seconds.
⚡ Recommended Generator
| Characteristic | Recommendation |
|---|---|
| Minimum Power | 5 kVA |
| Ideal Power | 6–7 kVA (for safety margin) |
| Type of Generator | Single Phase (if the compressor is 230V) or 3-phase (if it's 400V) |
| Recommended Extras | AVR regulator, electric start, thermal protection |
💡 Tip: If your compressor has direct start, the peak consumption will be higher. If you have a star-delta starter or variable frequency drive, the generator may be smaller.
🧠 What if the generator is too small?
The compressor will not start or it will start with difficulties.
You can damage the motor of the generator or the compressor.
The generator works under strain, with the risk of overheating.
🛠️ What if the generator is bigger than necessary?
You will have more safety margin for other tools.
More stability and life span.
But you will also have more weight, conmsumption and costs.
📌 Practical Conclusion
For a 3 HP compressor, don't risk it: choose a generator of at least 5 kVA, and if you can, go up to 6 or 7 kVA to work with peace of mind. Make sure it has AVR and good ventilation if you are going to use it for hours.
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