Miller Bobcat 250 Application Manual - Page 8

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Miller Bobcat 250 Application Manual

4. Frequently Asked Questions

How many watts does it take to power basic items in an average size house?
In a typical home, essential items use about 4000 − 6000 watts of power. Select a gen-
erator that can provide the necessary power while maintaining rated voltage. Low volt-
age may damage appliances and other equipment (see power curve example below).
300
150
264
132
250
125
216
108
200
100
150
75
100
50
50
25
0
0
0
0
Tools and motors are designed to operate within 10% of 120/240 VAC. The Bobcat's
power generator provides strong power while keeping the voltage within 10%of 120/240
VAC. This increases tool/motor performance and life.
What is the difference between running watts and starting watts?
Running watts are the continuous watts needed to keep items running. Starting watts are
extra watts needed for two to three seconds to start motor-driven
products like a refrigerator or circular saw.
Why is only one additional starting watt item used to calculate your total watt re-
quirement?
Unlike running watts, starting watts are only needed during the first few seconds
of operation. In most cases, only one item will start or cycle at the same time, therefore
this is the most accurate estimate.
What if I can't determine the running or the starting watt requirement for a tool or
appliance?
If the running watts are not on the tool or appliance, you may estimate using the following
equation: WATTS = VOLTS x AMPS.
Only motor-driven items will have an additional starting requirement. The additional start-
ing watts required in most cases may be estimated at 3 − 7 times the rated running watts.
Resistive Load
(requires constant amount of power)
Page 4
GENERATOR POWER CURVE − BOBCAT
20
40
60
80
AC POWER AMPS AT 120 VOLTS
10
20
30
40
AC POWER AMPS AT 240 VOLTS
(Motors require as much as 3 − 7 times more
10,000 watts
10%
100
120
140
160
50
60
70
80
Non-Resistive Load
power when starting than when running)
180
200
220
90
100
110
VOLTS 115
AMPS
4.5
Hz
60
Rating Data
S-0623