Generator Power; Inverter Power; Shore Power - NewMar ventana 2017 Owner's Manual

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.

Shore Power

30 Amp Plug
The inverted circuits move from the inverter's internal transfer switch to the inverter subpanel (a smaller breaker box).
From the subpanel, the power circulates to the individual breakers and to the electrical outlets and appliances.
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50 Amp Plug
Most RV parks provide 30 Amp, 120 Volt at
the site; however, many parks also
provide 50 Amp, 240 Volt service to
accommodate the electrical needs of newer
and larger coaches. Shore power is supplied
to the coach via a power cord. Two sizes of
power cords are found in Newmar coaches:
50 Amp and 30 Amp. The 50 Amp cords are
made up of four conductors #8 stranded wire
and a molded plug. The 30 Amp cords are
made up of three conductors #10 stranded
wire and a molded plug.
Shore power enters through the 30 or 50 Amp
power cord to the power cord reel (if
equipped). From the power cord reel, it
travels to the transfer switch and then to the
main breaker box where it is dispersed to the
individual circuits to supply power to hard-
wired components such as air conditioners,
water heaters, etc. and then to the inverter (if
equipped).