©
2010 Magnum Energy, Inc
Page 19
Installation
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 the corresponding overcurrent protection.
2.5.1 Pre-AC Wiring Requirements
CAUTION:
Before installing any AC wiring, review the safety information and cautionary
markings at the beginning of this manual and the directions below to ensure a safe and
long-lived system:
Read all instructions and cautionary markings located at the beginning of this manual
and in the Pre-installation section before installing the inverter and batteries.
Always use properly rated circuit-breakers. If using an electrical sub-panel, circuit
breakers can only be moved from the main electrical panel to the sub-panel if the
breakers are also listed to be installed in the sub-panel.
AC wiring must be no less than #12 AWG (3.3 mm
2
) gauge copper wire and be
approved for the application (i.e., renewable energy systems).
DO NOT connect the inverter’s output to an AC power source. This could cause
severe damage to the inverter and is not covered under warranty.
•
•
•
•
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. After determining
the proper AC wire sizes, they are required to be protected from short circuits and overloads by
an overcurrent protection device, and have a means to disconnect the AC circuits.
The RD-E Series allows the AC input and output wiring to be permanently wired. The inverter’s
input is wired to the service/distribution panel (main panel). The inverter’s output is then wired
to a dedicated panel (sub-panel). The inverter uses the circuit breakers provided in the panels as
the overcurrent protection and the AC disconnect device.
AC overcurrent protection isn’t 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,
be properly sized, and be branch circuit rated for the wire it’s protecting and the appliances being
powered.
When in Standby mode, the full AC continuous pass-thru capacity of the RD-E Series inverter/charger
is 30 amps. For a 30 amp continuous pass-thru capability, each AC LINE IN input to the inverter requires
a 30 amp continuous duty rated breaker
1
, which corresponds to a minimum cable size of #10 AWG²
(5.3 mm
2
) in conduit. If you are using other circuit breakers/wire sizes, refer to the appropriate
electrical codes for proper sizing requirements.
CAUTION:
The inverter’s internal AC transfer relay contacts are rated for 30 amps
per leg, the pass-thru current must be no greater than 30 amps per leg or damage to
this relay may occur.
Note 1 - The breaker must be de-rated by 80% if not rated for continuous duty. Circuits are not to be operated continu-
ously at more than 80% of rating unless listed with a 100% continuous rating.
Note 2 - Copper wire should be rated with 90° C insulation at an ambient temperature of 30° C (86 °F).
