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Use the Load Evaluation Calculator below together with the list of wattage requirements for common appliances. But keep in mind that these wattage requirements are only estimates. If you know exactly which appliances you’ll use you can look at the label(s) or manufacturers website to get the exact wattage usage.

When you’re done, you should have a number of the actual watt hour load per day.

Load Evaluation Calculator
Appliance Quantity Watts
(V x A)
Mult. * 1.5 for AC conversion
Hours On per Day Watt Hours per Day



Total Watt Hours per Day:

Watts
Watt Hours Required Assuming Inherent Efficiency Loss:
Watts

Wattage Requirements for Common Appliances

Common Appliances Estimated Watts Common Tools Estimated Watts
Coffee Maker 600-1200 Angle Grinder 900
Keurig 1500 (max)
200-400 (continuous)
Drill (1/4″-1/2″) 500-960
Blender 300-1000 Disc Sander 1200
Microwave
(600-1000 Watt Cooking Power)
1000-2000 Jig Saw 300-700
Waffle Iron 800-1500 Band Saw 700-1200
Hot Plate 750-1500 Table Saw 1800
Electric Skillet 1000-1500 Cicular Saw 1400-1800
Toaster Oven 1200 Chop / Cut Off Saw 1500-1800
Toaster 800-1500 Shop Vac 6.5 hp 1440
Hair Dryer 1000-1875 * Electric Chain Saw 14″ 1200
Vacuum Cleaner 300-1500 * Airless Sprayer 1/2 hp 750
Space Heater 750 / 1500 * Air Compressor 1 hp 2000
Clothes Iron 1000-1500 Pumps and Air Conditioners Estimated Watts
* Refrigerator 500-750 * Well Pump 1/3 hp 750 (Running)
1400-3000 (Starting)
* Chest Freezer 600 * Well Pump 1/2 hp 1000 (Running)
2100-4000 (Starting)
* Washing Machine 500-1000 * Sump Pump 1/3 hp 800 (Running)
1300-2900 (Starting)
Furnace Fan 750-1200 * Sump Pump 1/2 hp 1050 (Running)
2150-4100 (Starting)
Household Fan 50-120 * Air Conditioner
(7000 BTU to 10,000 BTU)
1000-1500 (Running)
2200-5000 (Starting)
Clock Radio 10-50 Lights Estimated Watts 
Stereo 30-100 100 watt incandescent bulb 100
Cell Phone Charger 10 25 watt compact fluor. bulb 28
Laptop Computer 20-75 50 watt DC incandescent 50
MacBook Pro 85 40 watt DC halogen 40
iPad / Tablet 10-20 20 watt DC compact fluor. 22
Desktop with Monitor 200-400 CFL Bulb (60-watt equivalent) 18
Inkjet Printer 15-75 CFL Bulb (40-watt equivalent) 11
Laser Printer 500 (continuous)
2000 (peak)
CFL Bulb (75-watt equivalent) 20
Photographic Strobe
(300 Watt-Second)
1200 (peak) CFL Bulb (100-watt equivalent) 30
Aquarium 50-1000
TV 32″ LED/LCD 50
TV 42″ Plasma 240
Home Theater Projector 200
Blu-Ray or DVD Player 15
Satellite Dish / Receiver 20-30
Video Game Console
(Xbox / PS4 / Wii)
40-140