🔋 Generator Fuel Calculator

Fuel Type

Generator Rated Power

Load (% of rated capacity)

Tank Capacity

Tank Fill Level

Fuel Price per Litre (for cost)

No. of Days to Run

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🔌 Load Planner

Add appliances to calculate total load and required generator size.

Appliance

Watts

Qty

📦 Fuel Stockpile Planner

Calculate how much fuel to store for emergencies and planned outages.

Daily Usage (Litres/day)

Outage Duration to Prepare For

Fuel Price per Litre

Already have in stock

📐 Generator Fuel Calculations

Fuel Consumption Formula

Fuel Consumption (L/hr) = kVA × Load% × Fuel Rate Fuel rates (at 100% load): Petrol generator: 0.30–0.40 L/kVA/hr Diesel generator: 0.20–0.28 L/kVA/hr LPG generator: 0.25–0.35 L/kVA/hr (kg/hr) Example: 5 kVA petrol generator at 75% load Fuel/hr = 5 × 0.75 × 0.35 = 1.31 L/hr Runtime from 15L tank: Runtime = 15 / 1.31 = 11.5 hours

Load Factor Impact on Fuel Use

Fuel consumption is NOT linear with load: 50% load: ~65% of full-load fuel consumption 75% load: ~82% of full-load fuel consumption 100% load: 100% of full-load fuel consumption Running at 75% load is the sweet spot: - Better fuel efficiency than 100% load - Some headroom for startup surges - Longer generator life vs running at 100% Never run a generator below 30% load for extended periods (wet stacking / carbon buildup).

Generator Sizing Rules

Step 1: Add up wattage of all appliances Step 2: Multiply by 1.25 (25% safety buffer) Step 3: Add startup surge for motors (motors need 2-3× running wattage to start) Example: AC 1.5T: 1500W running, 4500W start Refrigerator: 200W running, 600W start Lights + fans: 300W running, 300W start TV + misc: 200W running, 200W start Running total: 2200W With 25% buffer: 2750W = 3 kVA generator minimum With AC surge: ~5 kVA recommended

❓ Frequently Asked Questions

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AI-powered generator sizing recommendations, fuel planning for extended outages and maintenance schedule reminders.

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🔋 Generator Fuel Calculator