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ELECTRICAL
INTERIOR
EXTERIOR
•
Rear bedroom
•
Rear bathroom
•
Closet
•
Front Overhead Cabinet
•
Power cord compartment
•
Left, front electrical compartment (located beneath
the driver window)
•
Front firewall (gas coaches)
There are also some circuits that are protected with an
inline fuse. Some fuse blocks have fixed relays integrated
on a board. The board below is located in the cord
compartment.
Basic 12 Volt Power Flow
Since a battery is only an electrical storage component,
120 Volt power must be present to charge the batteries
from the converter or inverter/converter combination
unit. It is necessary to have 12 Volt power supplied from
the coach’s house battery bank in order to operate the
interior lights and other 12 Volt loads such as slideout
control systems, water pumps, vent fans, monitoring
systems, etc.
Most of this power flows through the battery disconnect
to the fuse block or mini-breakers, which prevents
overloading the circuit prior to progressing to the 12
Volt load. There are some 12 Volt circuits that do not go
through the house battery disconnect; however, these
loads still pass through a fuse or mini-breaker before
progressing to the load.
When a 12 Volt load or component is not working,
both 12 Volt power (+) and 12 Volt ground (-) are
needed for the load to complete the 12 Volt circuit.
IMPORTANT
!
120 Volt Electrical System
This article 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.
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