©
2012 Magnum Energy, Inc.
Page 10
Installation
2.2 Location
Refer to the dimensional drawing in Figure 2-2 to determine an appropriate area to install the
MMP enclosure/inverter system. Install it only in a location that meets the following requirements:
Clean and Dry
–
The MMP/inverter system must be mounted indoors in a relatively cool, clean,
and dry environment.
Ventilation –
If a Magnum inverter is installed on the MMP enclosure, the inverter will pull in air
through the intake vents. In order for the inverter to provide full output power and avoid over-
temperature fault conditions, do not cover or block the MMP enclosure ventilation openings or
install it in an area with limited air
fl
ow. At the minimum, allow three inches of clearance to the
left and right sides of the MMP enclosure to provide adequate ventilation.
Close to the Battery Bank –
The MMP enclosure/inverter system should be located as close to the
batteries as possible. This is to ensure the battery cable length is kept as short as possible. Long DC
wires tend to lose ef
fi
ciency and reduce the overall performance of an inverter. However, the MMP
enclosure, the inverter, and any other equipment that can spark (or that corrosion could damage)
should not be installed in the same compartment/room as the batteries or mounted where it will
be exposed to gases produced by the batteries. These gases are corrosive and will damage this
equipment; also, if these gases are not ventilated and if allowed to collect, they could ignite and
cause an explosion. Consult your battery supplier for proper installation requirements.
Info:
Consult your inverter owner’s manual to determine the proper sized inverter-
to-battery cables for the distance that is used. However, this cable must not be sized
any smaller than the minimum size requirement for the DC disconnect breaker in the
MMP enclosure. The MMP175 models require a minimum 00 (2/0) AWG cable, and the
MMP250 models require a minimum 0000 (4/0) AWG cable.
Safe –
Keep any
fl
ammable/combustible material (e.g., paper, cloth, plastic, etc.,) that may be
ignited by heat, sparks or
fl
ames at a minimum distance of twelve feet away from the MMP/inverter
system. Do not install the MMP/inverter system in any area that contains extremely
fl
ammable
liquids like gasoline or propane, or in locations that require ignition-protected devices. Sparks
from relays, circuit breakers, etc., could ignite the fumes or spills.
Accessible –
Do not block access to the front of the MMP enclosure. Maintain at least a 36”
(
91
cm) clear space in front to access the AC and DC wiring terminals and connections inside the
MMP enclosure, as they will need to be checked and tightened periodically.
2.3 Conduit
Knockouts
The MMP
enclosure comes standard with knockouts for 1/2”, 3/4”, 1”, 1¼”, 1½”, and 2” conduits.
Figure
2-2 shows the location of these conduit knockouts.
The 1/2”, 3/4”, and 1” knockouts are
for the PV array, DC loads, and other smaller input cables. Select the appropriate knockout that
is close to the terminal that the wire will connect to, or whichever one works for the way your
fi
eld wiring comes in. The 1½” and 2” knockouts on the bottom of the MMP enclosure are used
to connect to the battery bank.
Info:
The knockouts can be easily removed by tapping the edge with a straight bladed
screwdriver and a hammer, then
twist out with pliers. Refer to Figure 2-3.
Before removing the appropriate knockouts and mounting the MMP enclosure, think about whether
you are going to use
cable clamps or conduit and
all the different wiring required, such as:
• Wiring from the MMP enclosure to an AC sub-panel
• Wire runs from the utility and/or a generator to the MMP enclosure
• Battery cable wiring from the battery bank to the MMP enclosure
• Additional wiring from any external DC source (PV, wind, or hydro) to the MMP enclosure
• Small signal wiring (battery sensors, battery monitoring, auto gen starting)
• Attaching lightning arrestors
• PV charge controller wiring
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