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©
2009 Magnum Energy Inc
.
5.3 Parallel System Connections and Components
The basic installation procedure of the parallel system is similar to that of single inverter system.
However, the AC and DC connections and components required in the parallel system must be
considered.
5.3.1 AC and DC connections simplifi ed using Magnum Panels
The AC and DC connections in the parallel system depend upon other components (noted in
the two section below in
bold
), but are simpli
fi
ed when using the Magnum Panel (MP) Series of
enclosures. As shown in Figure 5-1, the AC Panel and DC Panel - which are part of the MP Series
enclosures - provide these separate components; and the speci
fi
c AC or DC wiring to these
components are completed for you. Figures 5-2 and 5-3 are simpli
fi
ed diagrams of the AC and DC
Panels showing the connections and components.
5.3.2 AC Connections Required in Parallel System
The AC input supply to the parallel system must be a 120/240 VAC split-phase system that pro-
vides two line conductors (referred to as L1 and L2), a neutral, and ground. Each MS-PAE inverter
requires a double-pole circuit breaker rated for a maximum 30A each pole. Typically the AC supply
originates in a main distribution panel, providing the separate
AC Breakers
required for the AC
input of each MS-PAE inverter. This main panel also has to provide the
AC Buss-Bars
to allow
connection of the neutral and ground conductors to each inverter input.
The AC output side of the parallel system requires an electrical panel, referred to as the inverter
panel, that combines all the inverter outputs and be equipped with a large double-pole circuit
breaker rated for the total output current of the parallel system. This inverter panel must provide
the
AC Buss-Bars
for the neutral and ground conductors from each inverter output.
If the inverter system requires isolation from the AC source for servicing without losing power to
the AC loads, an
AC Bypass
should be installed between the AC input and output connections.
5.3.3 DC Connections Required in Parallel System
When inverters are stacked they must operate from a common battery bank. In other words,
the DC negative of one inverter must be common with the second inverter and likewise for the
DC positive. Each inverter must be wired to the single battery bank separately and have a
DC
Breaker
in the positive side, matched to the cable size.
All DC negatives are required to be combined on a
DC Buss-Bar
and if the system requires battery
bank monitoring, a full system
DC Shunt
will need to be installed in the DC negative side.
A C
B Y P A S S
O F F O N
IN V E R T E R
B U S S -B A R
M P S E R IE S
(A C P A N E L )
M S -P A E IN V E R T E R S
(1 - 4)
IN
O U T
A C L O A D S
(C u sto m e r
C o n n e c tio n)
A C S O U R C E
(C u sto m e r
C o n n e c tio n)
A C
B U S S -B A R S
A C
B U S S -B A R S
A C B R E A K E R S
(1 – 4 )
M A S S L1 S L2 S L3
Figure 5-2, Simplifi ed Magnum Panel
(AC Panel)
Figure 5-3, Simplifi ed Magnum Panel
(DC Panel)
D C
B R E A K E R S
D C B R E A K E R S
(1 – 4 )
M A S S L1 S L2 S L3
O
P TIO N
M P S E R IE S
(D C P A N E L )
M S -P A E IN V E R T E R S
(1 - 4)
P O S
N E G
D C
S H U N T
D C
B U S S -B A R S
D C
B U S S -B A R S
D C L O A D S
(C u sto m e r
C o n n e c tio n)
D C S O U R C E
(C u s to m e r C o n n e c tio n)
N E G
P O S
Parallel Operation
