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.
GENERATOR WORKSHEET
|
|
RUNNING
WATTAGE REQ'D
|
ADDITIONAL STARTING WATTAGE REQ'D
|
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
|
500-1200
|
1700
|
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
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 EF2800i, that can produce
2,500 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.
*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.
|