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

Page 13

2010 Magnum Energy, Inc.

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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