Electrical Systems - House
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DIPLOMAT
8•218
NOTE: To calculate watts to amps, simply divide the watt fig-
ure by the voltage of which the item operates from. For exam-
ple: The electrical item is rated at 1,370 watts. Divide that by
the operating voltage of 115 Volts which equals 11.913 Amps.
Use this formula to calculate load to current supply ratio.
The Energy Management System is easily identified by the remote display
panel located in the inside overhead compartment next to the entrance door.
The 50 Amp Smart EMS consists of two elements: the display panel and the
bedroom distribution panel. The display panel is mounted in the inside overhead
compartment next to the entrance door. The distribution panel, located in the bed-
room, is a completely self-contained 120/240 Volt power distribution and energy
management system intended to be used in recreational vehicles. It is housed in
a sheet metal enclosure with removable front panel. It provides circuit protec-
tion for all the 120 Volt AC loads in the motorhome and a system of energy man-
agement to minimize the over-loading and tripping of circuit breakers.
Circuit Breakers:
The distribution panel offers slots for eight single or dual, standard 120 Volt
circuit breakers. Two of these breakers, located in the two center positions,
is the 50 Amp breaker that acts as the main input protection for each of the
lines supplying the remainder of the branch breakers (up to 12).
Energy Management:
The 50 Amp Smart EMS automatically senses the available power to the
motorhome. It determines whether it is connected to a 120 Volt AC - 30
Amp shore power source, 50 Amp shore power source or generator source.
Depending upon available power, it controls the operation of six possible
loads as indicated on distribution panel. These may be any type load, but
are typically heavier loads; those whose use can be “postponed” until a
time when current is available for their use. If the available power source is
120 Volt AC - 30 Amp shore power it attempts to keep the total 120 Volt
current draw to less than 30 Amps.
Operation:
If 120 Volt AC is not available at the distribution panel, L1 or L2 outputs,
the system shuts itself off. This feature is intended to prevent the system
from drawing current from the +12 Volt DC battery supply when not in
operation.
When 120 Volt AC power is applied the system automatically powers up and
determines the nature of the power source. If the generator is running 120 Volt
AC will be present at the distribution panel L1 and L2 inputs. In this mode the
energy management feature is disabled and all control relay contacts are closed,
Energy Management
System - 50 Amp
(Optional)
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