Magnum Energy MS-AEJ Series User Manual

Page 28

Page 22

2.4 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. Refer to fi gure 2-13 for an over-

view of the AC wiring.

2.4.1 Pre-AC Wring 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:

AC Loads powered by the inverter will need to installed into an electrical panel.
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 break-

ers 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 #10 AWG (5.3 mm

) gauge copper wire and be approved

for residential wiring per the NEC (THHN as an example).
DO NOT connect the inverter’s output to an AC power source.

Listed or labeled equipment shall be installed and used in accordance with any instruc-
tions included in the listing or labeling.

2.4.2 AC Wire Size and Overcurrent Protection

The AC input and output wiring must be sized

per the NEC and

local electrical safety code require-

ments

to ensure the wires ability to safely handle the inverter’s

maximum load current. After

determining the proper AC wire sizes, the inverter’s AC input and output wires are required to be

protected

from short circuits and overloads by an overcurrent protection device

and have a means

to disconnect the AC circuits.
Overcurrent protection is not included in the inverter and must be provided as part of the installa-

tion.

The overcurrent protection device must be a circuit breaker or a fuse

and

be properly sized

and branch circuit rated for the wire it is protecting and the appliances being powered.

The MS-AE series provides a terminal block (see fi gure 2-12) that allows the AC input and output

wiring to be

permanently wired. This terminal block allows a

service/distribution panel (main

panel) to be wired to the inverter’s input and a dedicated panel (sub-panel) between the inverter’s

output wiring and the AC loads. These systems use the circuit breakers provided in the panels as

the overcurrent protection and the AC disconnect device.

When in the Standby mode, the full AC continuous pass-thru capacity of the MS-AE Series inverter/

charger is 30 amps for each AC leg (AC HOT 1 and AC HOT 2). To obtain the 30 amp continuous

pass-thru capability of the inverter, the AC input to the inverter requires a maximum 40 amp double-

pole breaker

, which corresponds to a minimum cable size of #8 AWG

in conduit. If you are using

other wire sizes, refer to the appropriate electrical codes for circuit breaker requirements.

CAUTION: The inverter’s internal AC transfer relay is rated for 30 amps (each leg), the

pass-thru current must be no greater than 30 amps or damage to this relay may occur.

Note 1 - A 40 amp breaker is used because the NEC requires that circuits are not to be operated continu-

ously at more than 80% of rating unless listed with a 100% continuous rating (40 amps x 0.8 = 32 amps

continuous).
Note 2 - Copper wire rated with 90°C insulation at an ambient temperature of 30°C (86°F).

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Installation