Standby Installation To Home Or Building; Determining Electrical Load For Generator - Desa Reddy RGH3000 Owner's Operation And Installation Manual

PORTABLE GASOLINE GENERATORS
STANDBY
INSTALLATION TO
HOME OR
BUILDING
WARNING: Have standby in-
stallation performed by a skilled,
licensed electrician. Do not let
anyone else wire into a utility
circuit. Personal injury, equip-
ment damage, or damage to home
could occur.
IMPORTANT: This generator will not
power your entire home. Most home utility
electric service is more than 60 amps. This
will exceed generator output. Only power
needed items during a power outage. Make
sure total wattage of electrical load does not
exceed rated wattage of generator.
You may need to use this generator as a
standby power source. During a power out-
age, the generator will power selected items
in a building. Have generator and additional
wiring installed by a skilled, licensed elec-
trician. This is not a do-it-yourself job. Fol-
low all local codes.
WARNING: The electrician
must install a double-throw trans-
fer switch. This isolates existing
electrical circuits from the utility
power line. If not isolated, gen-
erator output will back-feed into
utility power line. This may elec-
trocute a power company line
repair person.
DETERMINING
ELECTRICAL LOAD
FOR GENERATOR
You must decide what electrical load your
generator can power. Do this before using
generator. Use the following four-step
method. It will help you select a load that is
not too large. Make sure total wattage of all
electrical loads does not exceed rated watt-
age of generator. For rated wattage of your
generator, see Specifications, page 5. Elec-
tric motors present a special problem when
figuring load. Read Step 3 carefully.
®
1. Make two lists of items you want pow-
ered by generator. List all motors and
motor powered appliances in one. List
all lights, small appliances, etc. in the
other. For standby service to home or
building, only include items you must
power.
2. Enter running watts of each item ex-
cept motors. The light bulb or appli-
ance nameplate lists its wattage. Re-
member, 1KW = 1000 watts. Note: The
nameplate may not list wattage. It may
only list volts and amps. The formula
for finding wattage is: Volts x Amps =
Watts. For example: An appliance
nameplate states 3 amps at 120 volts. 3
amps x 120 volts = 360 watts.
3. Electric motors present a special prob-
lem. They require up to three-times
their rated wattage to start. Chart 2,
below, shows starting watts for differ-
Chart 1 - Typical Electric Appliance Wattages
Equipment
Light bulb (100W)
Radio
Fan
Television
Furnace fan (1/3 hp)
with blower
Vacuum cleaner
Sump pump (1/3 hp)
Refrigerator/freezer
6" Circular saw
Floodlight
Chart 2
Motor Approximate
HP Running
Rating Watts
1/8 275
1/4 400
1/3 450
1/2 600
3/4 850
1 1000
1 1/2 1600
2 2000
3 3000
* – Always use starting watts, not running watts, when figuring correct electrical load.
x – Motors of higher horsepower are not generally used.
4.
Running Starting
Watts Watts Equipment
100 100 1/2" Drill
150 150 Toaster
200 600 Coffee maker
400 400 Skillet
14" Chain saw
600 1800 Water well pump
600 750
700 2100 Hot plate/range
800 2400
800 1000 10" Table saw
1000 1000 Water heater
Approximate Starting Watts*
Universal
Motors
(small appliance)
400
500
600
750
1000
1250
1750
2350
x
10
ent size motors. For example: an elec-
tric motor nameplate states 5 amps at
120 volts. 5 amps x 120 volts = 600
watts running. Multiply this figure by
3. This will show the starting watts
needed. 600 watts x 3 = 1800 watts to
start. When figuring the generator load
for motors, you must use the starting
watts figure. Do not use the running
watts figure. Note: Some motors re-
quire nearly the same wattage to run as
to start. These items include saws,
drills, hair dryers, and food mixers. See
Chart 1 for typical appliance wattage
examples.
Add watts and starting watts of all
items. This total must not be larger than
the rated wattage of your generator. It
is a good idea to have up to 25% extra
capacity for future needs or extra
equipment.
Running
Watts
1000
1200
1200
1200
1200
(1/2 hp) 1000
(per burner) 1500
2000
(storage-type) 5000
Repulsion
Induction Capacitor
Motors Motors
600 850
850 1050
975 1350
1300 1800
1900 2600
2300 3000
3200 4200
3900 5100
5200 6800
Starting
Watts
1250
1200
1200
1200
1500
3000
1500
6000
5000
Split
Phase
Motors
1200
1700
1950
2600
x
x
x
x
x
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