Magnum Energy Series Stacking Cable Kit (ME-SSI) - Manual (Page 13)

©
2010 Magnum Energy, Inc. 8
Installation
AC Wiring
This section will discuss AC wiring that is unique to series stacking;
otherwise, refer to you inverter’s owner’s manual for any other in-
formation on AC wiring. When wiring the AC to your series stacked
inverters there are many variables that must be considered for a
safe and trouble-free installation. The following options should be
determined prior to any AC wiring:
Info: The AC source must be connected to both
inverters. An AC source connected to only one inverter
in a series stacked confi guration is not supported and
will not work.
AC Input Source – When an AC source is connected to the in-
verter’s input and passing thru both inverters (Charge mode), the
AC output of the two series stacked inverters is determined by the
phase and voltage of the incoming AC source (utility or generator).
The series stacked inverters can be operated from the following
types of 120VAC/60Hz AC sources:
Split-phase (120/240VAC) – This AC type provides both
120 and 240VAC. It has two 120VAC lines (L1 and L2), a
neutral and a ground. The two 120VAC lines are 180° out-of-
phase with each other, so that the combination of the L1 and
L2 lines total 240VAC and the voltage between either L1 or L2
and neutral is 120VAC. When split-phase power is connected
to the HOT 1 IN of each inverter (L1 to one inverter and L2
to the other inverter) and passing through the inverters, the
incoming power is shared with the charger and the HOT 1 OUT
lines continue to be 180° out-of-phase. This source is the ideal
type as it will be able to provide 120/240VAC to power loads
when inverting and also in Charge/Transfer mode. See Figures
7 and 9.
Single-phase (120VAC only) – This AC source has one
120VAC line, one neutral, and a ground. The 120VAC line
is fed to both the HOT 1 IN’s of each inverter and when in
Charge mode, it will pass thru to the HOT 1 OUT’s of each
inverter. The incoming power is shared with the charger, but
since the two lines come from the same source (unlike the
split-phase type), the two lines are in-phase and the volt-
age between the HOT 1 OUT lines will be zero. While this AC
source is used to charge your batteries, you must remember
that you will not be able to power any 240VAC loads (voltage
from L1 to L2 will be zero). Once the AC source is disconnect-
ed and the inverters again start inverting, you can reconnect
your 240VAC loads. See Figures 8 and 10.
Three-phase (with neutral) – This AC source typically has
three 120VAC lines, a neutral and a ground. The output of
each line is 120° out-of-phase from each other, so the voltage
from one line to another is 208VAC and the voltage between
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