Ac Wiring - Magnum Energy MagnaSine Hybrid Owner's Manual

2.5

AC Wiring

This section provides information on how to make the AC connections to the inverter using the
correct AC wire size and corresponding overcurrent protection.
2.5.1 Pre-AC Wiring Requirements
CAUTION: Before installing any AC wiring, review the safety information at the
beginning of this manual and the following to ensure a safe and long-lived system:
• Always use properly rated circuit breakers. If using an electrical sub-panel, circuit
breakers can be moved from the main electrical panel to the sub-panel only if the
breakers are also listed to be installed in the sub-panel.
• AC wiring must be no less than #6 AWG (13.3 mm
approved for the application (i.e., residential wiring).
• DO NOT connect the inverter's output to an external AC power source unless used
in an AC Couple application*. Otherwise, severe damage to the inverter may occur
and this damage is easily detected and not covered under warranty.
* This inverter has the ability to be used in an AC Couple application. In an AC
Couple application, the Magnum inverter's output is connected to the output of a
grid-tie inverter to provide the AC reference for the grid-tie inverter. This causes
the grid-tie inverter's output to be synchronized to the Magnum inverter's output so
that the two AC outputs can be connected together without any damage occurring
to the Magnum inverter.
• The wire sizes recommended in this manual are based on the ampacities given in
Table 310.16 (in conduit) or Table 310.17 (in free air) of the NEC, ANSI/NFPA 70, for
75°C (167°F) copper wire based on an ambient temperature of 30°C (86°F).
WARNING: To reduce the risk of fi re, do not connect this inverter to an AC load center
(circuit breaker panel) having multi-wire branch circuits connected.
2.5.2 AC Wire Size and Overcurrent Protection
The AC input and output wiring must be sized per the local electrical safety code requirements
to ensure the wire's ability to safely handle the inverter's maximum load current. The AC wiring
must be protected from short circuits and overloads by an overcurrent protection device and have
a means to disconnect the AC circuits. AC overcurrent protection is not included in the inverter
and must be provided as part of the inverter installation. The AC overcurrent protection device
must be a circuit breaker or a fuse/disconnect and be properly sized and branch circuit rated for
the wire it is protecting and the appliances being powered.
Info: When wiring the AC input and output circuits, we highly recommend a full system
Inverter Bypass Switch. This simple item provides a convenient way to isolate the
inverter for battery maintenance, and it could save you hours of downtime—if you ever
need to service your inverter—by enabling you to continue to power your AC loads
without any re-wiring. Because we think it is an essential part of an inverter system,
every Magnum panel (MMP Series) is equipped with an Inverter Bypass Switch.
When the inverter is in Standby mode, the full AC continuous pass-thru capacity of the MSH-RE
Series inverter/charger is 60 amps (GRID IN/AC1 and GEN IN/AC2). If you are using other circuit
breakers/wire sizes, refer to the appropriate electrical codes for sizing requirements.
CAUTION: The inverter's internal AC transfer relay contacts are rated for 60 amps, the
pass-thru current for relay contact must be no greater than 60 amps or damage to this
relay may occur.
© 2013 Magnum Energy, Inc.
Installation
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