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Generator Sizing Help Guide

DETERMINING YOUR ENERGY NEEDS

BECAUSE WITH A GENERATOR, SIZE MATTERS
The first thing you need to do is determine what size generator would work best for your particular requirements.

This section will help walk you through that process.

When purchasing a generator, it's important that you select one that's capable of meeting your energy requirements.
  • You must match the rated output of the generator to the maximum anticipated power to be used.
This section will assist you in estimating the power requirements so you can purchase the generator that will satisfy your needs.
  • This includes using the accompanying worksheet to make a list of the tools and appliances you expect to operate, as well as the approximate power requirements for each device.
Once you have the list, you can estimate the highest demand that will be put on the generator under the "worst-case" conditions. With this figure, you can determine the appropriate model Yamaha generator for your particular needs.

WARNING: Electrocution, severe personal injury or death can occur: Do not connect any generator to any building's electrical system unless an isolation switch has been installed by a licensed electrician. Refer to the Generator Owner's Manual.

CAUTION: Property damage can occur: Do not connect any generator to any building's electrical system unless an isolation switch has been installed by a licensed electrician. Refer to the Generator Owner's Manual.

TAKE IT STEP-BY-STEP
Follow these steps when determining your energy needs:
  1. Identify the wattage requirements for the tools and appliances that you want to power. The power requirement for the tool or appliance can be found on its identification plate or in the Owner's Manual. If the power requirement is given in amps, multiply the amps times volts to derive the required watts.

    Amps x Volts = Watts

  2. Add up the required watts of all the tools and appliances you expect to operate simultaneously.

  3. The total watts derived in step 2 is the size Yamaha generator you need. These three simple steps will "size" a generator. Normally, you won't need to consider motor starting requirements when using a Yamaha generator. When a Yamaha generator is properly sized for a tool's or appliance's running requirements, Yamaha's surge capability or 3 times the rated output for three seconds usually is sufficient to handle the motor's starting surge needs.

The Additional Guidelines section explains the procedures to calculate and size for motor starting.

This chart lets you immediately add up all of the appliances you will most likely utilize:

G E N E R A T O R    W O R K S H E E T
  RUNNING WATTAGE REQUIREMENTS ADDITIONAL STARTING WATTAGE REQUIREMENTS TOTALS
HEATING/COOLING
Furnace Fan, gas or fuel oil furnace
1/8 horsepower 300 500  
1/6 horsepower 500 750  
1/4 horsepower 600 1000  
2/5 horsepower 700 140  
3/5 horsepower 875 2350  
Central Air Conditioner
10,000 BTU 1500 2200  
20,000 BTU 2500 3300  
24,000 BTU 3800 4950  
32,000 BTU 5000 6500  
40,000 BTU 6000 6700  
HEATING/COOLING SUB-TOTAL:  
KITCHEN
Refrigerator, Average 600 2200  
Dish Washer - Cool Dry 700 1400  
Dish Washer - Hot Dry 1450 1400  
Clothes Dryer - Gas 700 1800  
Clothes Dryer - Electric 5750 1800  
Microwave Oven, 750W 750 800  
Washing Machine 750 2300  
Coffee Maker 850 0  
Toaster 2-slice 1100 0  
Toaster 4-slice 1650 0  
Electric Skillet 1500 0  
Electric Range 6-in. element 1500 0  
Electric Range 8-in. element 2100 0  
Freezer 2500 2200  
KITCHEN SUB-TOTAL:  
BATHROOM
Hair Dryer 800 - 1700 0  
Iron 1200 0  
BATHROOM SUB-TOTAL:  
APPLIANCES
Lights- Wattage Actual:    
VCR 50 0  
Heating Pad 65 0  
Radio 100 0  
Television - Black & White 100 0  
Television - Color 300 0  
Dehumidifier 400 0  
Electric Blanket 400 0  
Garage Door Opener - 1/4HP 550 1100  
Garage Door Opener - 1/3HP 725 1400  
Well Pump - 1/3 hp 750 1400  
Well Pump - 1/2 hp 1000 2100  
Sump Pump - 1/3 hp 800 1300  
Sump Pump - 1/2 hp 1050 2150  
Vacuum Cleaner - Standard 800 0  
Vacuum Cleaner - Deluxe 1100 0  
APPLIANCES SUB-TOTAL:  
COMMERCIAL PRODUCTS
1/4" Drill 300 300  
Jigsaw 300 300  
Electric Weed Trimmer 500 500  
Router 1000 1000  
Belt Sander 1000 1000  
Disc Sander 1200 1200  
Chain Saw 1200 1200  
Worm Drive Saw 1560 3100  
12" Concrete Cutter 1800 3600  
7 1/4" Circular Saw 1500 3000  
Disc Grinder 2000 4000  
Air Compressor, Average 2000 4000  
COMMERCIAL PRODUCTS SUB-TOTAL:  
  GRAND TOTAL  
 
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