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 EN
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
|
1400
|
|
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 |
|
|
ADDITIONAL GUIDELINES
CONVERTING AMPS OR HORSEPOWER INTO WATTS
If necessary, use these formulas:
Watts = Amps x Volts
Running Watts* = Horsepower x 932** (for motors)
Remember, this worksheet lists average power requirements
— a particular manufacturer's device may use more or less than the listed
wattage.
- Add a 10% correction factor to your totals to help overcome
this uncertainty.
If your customer plans to operate devices that use electric
motors, list both the starting and running requirements
of each.
- Starting requirements of some devices maybe
significantly higher than their running requirements. This
higher demand must be considered when estimating your power needs.
Some small, universal motors — which do not draw a heavy starting load
(drills, small saws, blenders, etc.) — require very little extra current
for starting.
When listing items that use motors, take them in the order of
highest-to-lowest starting requirements, as shown in the example below.
Motor A, for instance, has a starting requirement of 2,600 watts, so
it's listed first, followed by Motor B at 1,300 watts, and Motor C at 1,000
watts.
MOTOR/
DEVICE |
STARTING
WATTS |
RUNNING
WATTS |
Motor A |
2,600 |
850 |
Motor B |
1,300 |
600 |
Motor C |
1,000 |
750 |
|
Once you have compiled an accurate list of what you will be
operating, you can calculate the maximum power requirements. There are three
different calculations you can make, depending upon the kinds of tools and
appliances on the list, and their intended use:
- No electric motors.
- One motor running at a time.
- More than one motor running at a time.
NO ELECTRIC MOTORS
If your list does not include any devices that use electric motors,
simply add the power (running) requirements of all the items on your
list to obtain the maximum power needed.
- For example, if you intend to use only an electric skillet,
a 100-watt light and a heating pad (as shown below), the maximum power
requirement would be 1,655 watts. In this case, a generator like the
EF2600, that can produce 2,300 watts rated output, is recommended.
DEVICE |
WATTS |
Electric Skillet |
1,500 |
Light |
100 |
Heating Pad |
65 |
Total: |
1,665 |
|
NOTE: The EF1600's
rated output is 1,400 watts, so its output would be too low to handle
this load on a continuous basis.
Footnotes:
*Running Watts is the amount of power a motor consumes once it has started
to run at normal speed.
**932 is the factor used to convert motor horsepower ratings to needed
electrical energy. It takes into account normal losses in utilizing that
power. |