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120 VOLT ELECTRICAL SYSTEM
Provides general information about the components and functions of the 120 Volt Electrical System
(AC) in Newmar coaches.
POWER SOURCES
There are three types of alternating current (AC) power sources available to the coach: shore power, generator power,
and inverter power. Shore power is provided by the RV park or by home service outlets and should be used whenever
possible. Generator power should mainly be used when shore power is not available, specifically while traveling, when
120 Volt power is necessary to run high amperage loads, or when dry camping requires 120 Volt for battery charging.
Inverted power is mainly used for light 120 Volt loads when shore power is not available and generator power is not
desired.
GENERATOR POWER
Generator power is produced within the generator and is
output through the main wiring to the transfer switch. From
the transfer switch, the power moves to the main breaker
box where it is dispersed to individual circuits (outlets) and
hard-wired components such as a water heater or boiler.
From the inverted circuits, generator power will then travel
through the inverter’s internal transfer switch and back to
the inverted subpanel to be dispersed through the individual
breakers to the outlets or appliances.
INVERTER POWER
This type of power starts at the battery bank. The battery
bank supplies 12 Volt power through cables to the inverter,
which uses the 12 Volt direct current to produce 120 Volt
alternating current. The inverter performs this action by
using a transformer to increase the voltage and modify the
higher voltage into a useable alternating current power.
Power then goes to the inverted sub panel, which is
dispersed through the individual breakers to the outlets or
appliances.
The inverter may provide battery charging while 120 Volts is
supplied via the generator or shore power. The inverter
performs this action by using the transformer to decrease
the voltage and rectify the alternating current into useable
direct current voltage. This is regulated by internal sensing
circuitry based upon the battery bank’s state of charge and
several other factors, depending on the coach's particular
inverter brand and type.
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