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