Magnum Energy Mini Magnum Panel (MMP Series) - Manual (Page 36)

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©
2013 Magnum Energy, Inc.
Installation
2.9.3 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 MMP enclosure provides AC circuit breakers for the inverter’s AC input. These breakers are
branch circuit rated and can be used as the overcurrent protection and the AC disconnect device.
This is true as long as the AC wires used are not smaller than the minimum wire size as shown
in Table 2-5 for your particular MMP model, and the ‘AC Input/Output Wiring Confi guration’ used.
If using a Magnum MS, MS-AE, MS-PAE, or RD Series inverter, the full AC continuous pass-thru
capacity of these inverters is 30 amps for each AC leg¹ (AC HOT 1 and AC HOT 2), and requires
a maximum 30-amp breaker on each AC input to protect the inverter’s inputs. This correlates
with the MMPxxx-30D models, which include a dual 30-amp input inverter breaker and requires
a minimum cable size of #10 AWG 2 in conduit.
In the MS or RD Series inverters, the AC HOT 1 and AC HOT 2 may be combined to obtain 60 amps
pass-thru capability. When tying the AC HOT 1 and HOT 2 together for a 60 amp continuous pass-
thru capability, the AC input to the inverter requires a 60-amp breaker. This correlates with the
MMPxxx-60S models, which include a single 60-amp breaker and requires a minimum cable size
of #6 AWG 2 in conduit. If you are using other circuit breakers/wire sizes, refer to the appropriate
electrical codes for proper sizing requirements.
2.9.4 AC Conductor Wiring
The following steps are basic guidelines for installing and connecting the AC wiring into and out
of the inverter. Refer to Table 2-5 to determine your AC wiring confi gurations before beginning.
WARNING: To prevent electrical shock, make sure all AC power (inverter, generator,
or utility) is off before making any AC connections inside the MMP enclosure.
Wiring External AC Source and AC Load Panel
1. Route an appropriate cable from a dedicated breaker in the main AC electrical panel through
one of the MMP enclosure’s knockouts to the EXTERNAL AC IN/OUT TERMINAL BLOCK (HOT
IN/NEUT IN side).
2. Route an appropriate cable from the EXTERNAL AC IN/OUT TERMINAL BLOCK (HOT OUT/NEUT
OUT Side) through another MMP enclosure knockout to the inverter’s AC electrical sub-panel
(or AC outlets, if using the Magnum inverter models with output breakers).
Wiring Inverter AC Input/Output
1. Route an appropriate cable from the INVERTER AC IN/OUT TERMINAL BLOCK (HOT IN/NEUT
IN side) to the inverter’s AC input terminals.
2. Route an appropriate cable from the INVERTER AC IN/OUT TERMINAL BLOCK (HOT OUT/NEUT
OUT side) to the inverter’s AC output terminals.
Wiring the AC Ground
Route the following AC ground wires; 1) the main AC panel’s ground busbar, 2) the ground wire
from the inverter’s AC sub-panel’s ground busbar (or the ground connection on the outlets, if
using the Magnum inverter with output breakers), and 3) the AC ground wire from the inverter;
and connect to the GROUND busbar in the MMP enclosure (Item 8 in Figures 1-2 and 1-4).
AC Wiring Inspection
After verifying all AC connections are correct, and all AC terminal screws are torqued correctly
(refer to Tables 2-1 to 2-3), replace the inverter’s AC wiring access cover and the covers on the
main electrical panel/sub-panel.
Note 1 – On Magnum MS2012/MS2000 (-15B and -20B) breaker models, the pass-thru current is limited by
the output breaker size.
Note
2 – This wire must be copper with a minimum rating of 300V, 75°C.