Nameplate Rating (watts) Use (watts)
10,000 or less 80% of rating
10,001—12,500 8,000
12,501—13,500 8,400
13,501—14,500 8,800
14,501—15,500 9,200
15,501—16,500 9,600
16,501—17,500 10,000Ratings are for freestanding ranges as distinguished from sep-
arate oven and cooking units.Freestanding Range RatingsTABLE
IIIadd additional service capacity or not.)
ABYC Standard E-11 offers a fairly complete
section on performing an AC load analysis,
and it really mirrors the techniques pre-
scribed by the NEC. The sidebar on pages
69–71 excerpts this material from ABYC E-11.
USING A POWER ANALYZER
I use a WattsUp? portable power analyzer made
by Electronic Education Devices. Although the
name may sound a little silly, the WattsUp? is
actually a high-tech, microprocessor-driven
device with great utility. Because wattage or,
more precisely, watt-hours are what utility com-
panies base their billing on, the WattsUp? device
is quite useful in performing power consump-
tion analysis on many boats. With it, you can:
- Perform power consumption analysis by
measuring wattage used. - Calculate the cost of operation for a piece
of equipment. Program in the local utility
cost per kilowatt-hour and allow the unit
to run through a normal daily service
cycle (typically, 24 hours).- Measure line voltage to an appliance.
- Measure amperage draw, minimum
amperage draw, and maximum amperage
draw. These values are useful for deter-
mining appropriate wire sizes and over-
current protection device ratings. - Calculate power factor, which is primarily
what I use it for.
The WattsUp? portable power analyzer. Six main modes display the pri-
mary data: watts, kilowatt-hours, time, cost, volts, and current.using power factor 71