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The EMS controls air conditioner loads using low-voltage switching and other 120 Volt, heavy-load appliances, such as
block heaters, water heating elements, and air conditioners. The EMS will also control the 2012 Magnum inverter charge
rate or switch to invert depending on the charging status. The charger will only reduce once it is in float status.
The current-sensing relay will display the amperage on each leg. The EMS will start shedding loads and look at the AC
current when it sheds a load, determining when it has enough current available to turn on the load again.
When the EMS sheds a load, it only looks at one leg to see how much of a load was shed. For coaches equipped with
the SilverLeaf system, refer to the SilverLeaf Functional Guide for more information on your EMS.
CONVERTERS
All Newmar coaches are equipped with a converter or an
inverter/converter combination. Converters are used to
transform alternating current power (120 Volt AC) to direct
current power (12 Volt DC). Converters supply the coach
with 12 Volt power to operate systems in the coach and
provide battery charging.
Newmar currently uses three sizes of converters: 45, 60,
and 80 Amp models. Previous units may have a 55 or 75
Amp converter or two 45 Amp converters with a total of 90
Amps available. When replacing a converter, it is necessary
to use the same size converter to ensure sufficient wiring
and breakers for the converter's input and output ratings.
Possible causes of converter failure:
• Overheating caused by cooling fan malfunction or
inadequate ventilation causing damage to the converter
• Blown fuses
INVERTERS
An inverter changes 12 Volt DC power to 120 Volt AC
power. Coaches with an inverter only typically use it for
powering the entertainment equipment like the TV, DVD,
and Blu-ray players. The inverters used for this purpose are
usually 600 watt to 1000 watt (1000 Watt inverters may also
power a small refrigerator) and do not have battery charging
capability.
The inverters are usually located in a basement
compartment of the coach. Some inverters have a remote
panel for an on/off switch in the overhead driver area or
above the entry door. When power is supplied by either the
generator or shore power, the inverter merely allows the
power to "pass through" and will then stop pulling power
from the batteries to try and supply 120 Volt power. There is
a protective breaker on the inverter to prevent circuit
overload.
Possible causes for inverter failure:
• Overheating caused by inadequate ventilation causing damage to the inverter
• Overloading the circuit causing "tripped" breakers
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