Choosing the right diesel generator capacity is one of the most important purchasing steps. Wrong choice can lead to equipment failure or wasted cost.

Power Calculation Steps:

Step 1: List Loads
List all equipment and devices that will run on the generator and note each one's power (watts or kilowatts).

Step 2: Calculate Motor Loads
Motor loads (pump, fan, compressor) have high starting current. Multiply their power by 1.25 to 3.

Step 3: Sum Total Load
Add all loads and add 20% for future growth.

Step 4: Apply Derating
At altitudes above 1000m and temperatures above 25°C, generator power decreases.

Step 5: Choose Final Capacity
Choose a generator that covers 70-80% of calculated load. Never choose a generator at 100% load capacity.

Important Note: For motor loads, consider Prime Power, not Standby Power.