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ELECTRICAL
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
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.
Newmar Corporation does not recommend use
of adapter, cheater, or dog-bone style connectors
that will modify the existing shore power cord to a
di ff erent style of outlet. Use of this type of adapter
will greatly reduce the amount of available current in
the unit, as well as create the potential for electrical
failure and/or fire.
IMPORTANT
!
1.
3.
2.
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.
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).
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.
SHORE POWER ADAPTERS
If an adapter is used, there are three common sizes of
power cord adapters available to adjust to a smaller
amperage outlet:
1. 30 amp to 20 amp
2. 50 amp to 20 amp
3. 50 amp to 30 amp
It is important to understand the risks involved and the
possible e ff ects of using adapters in conjunction with your
coach. Some of these risks and possible e ff ects include:
•
Melted or damaged adapters causing poor
connection (or no connection at all)
•
Melted or damaged 30 or 50 Amp plugs causing
fluctuations in voltage that may damage electronics
•
Insu ffi cient amperage causing the tripping of a
breaker at the post or a limited use of appliances
Low voltage can also be caused by use of adapters, long
extension cords, or extension cords with an insu ffi cient
wire size.
Newmar Corporation cannot assume liability for
failures occurring to the RV, its electrical system, or
any of its components from the use of any electrical
adapter.
IMPORTANT
!