Specifications

15
Figure 12, PowerCenter Mounting Dimensions
390 mm
15 3/8“
15.375“
128 mm
5.0“
337 mm
13 1/4“
13.25“
Bottom View
Front View
Enclosure Dimensions
267 mm
10 1/2“
10.5“
333 mm
13 1/8“
13.125“
3.8 mm
0.150“
Diameter
4 Places
Mounting Hole Layout
Mode Selector Button
Back View
Step 5:
Install the bottom two mounting fasteners, and
then tighten the top two fasteners.
C. Wiring
All wiring should conform to the National Electric
Code or other governing local electrical code.
The use of electrical conduit for wiring between
components is highly recommended. If you have
any connections with dissimilar metals (aluminum
to copper) they should be coated with an anti-
oxidation compound to prevent galvanic corrosion.
All loads should be protected by fuses or circuit
breakers to avoid hazards from accidental short
circuits.
The wind turbine tower must be well grounded
and a good quality lightning surge arrestor, con-
nected to a good quality earth ground, should be
installed on the wiring from the wind turbine. We
recommend a Delta LA302DC arrestor installed
into the third (from the left) rear entrance hole of
the enclosure. This tucks the arrestor neatly be-
hind the enclosure. The arrestor leads are con-
nected to the wind turbine terminals.
The PowerCenter does not have a built in ground,
all circuits are floating, such that either the posi-
tive or the negative can be grounded. Some in-
verter manufacturers recommend grounding and
some electrical codes require it. If you do ground
the PowerCenter, please conform to local practic-
es for grounding either the positive or negative
bus.
All negative leads are connected together on the
PowerCenter circuit board, so grounding the bat-
tery negative lead, will ground the turbine nega-
tive, the PV negative, and the dump load negative
as well. This is the preferred grounding method;
the enclosure should also be grounded, by bolting
a box lug to it in a convenient location.
D. PowerCenter Connections
Cable Entrances: As shown in Figure 13, wiring
can be connected to the PowerCenter from below
or behind or in a combination of both. A total of
eighteen 7/8” (20 mm) entrance holes are pro-
vided.
Box Lugs: The PowerCenter is supplied with box
lugs (not shown in Figures 13 and 14) that are
used to connect electrical leads to the terminals
on the PowerCenter circuit board. These lugs can
accommodate wire sizes from 35 mm
2
to 10 mm
2
(8 AWG to 2 AWG). DO NOT use these lugs
for the wiring connections to the wind turbine
at the top of the tower.
Plastic Grommets and Plugs: The PowerCenter
is supplied with a number of plastic grommets and
plugs for the wire entrance holes at the bottom of
the enclosure. Grommets should be used to pro-
tect incoming wires from the hard edge of the
aluminum case. They are not necessary if you
are using conduit or special cable entrance fit-
tings. Holes not used for wiring should be sealed
using the plastic plugs. Even though 24 VDC is
generally not considered a lethal voltage, most
electrical codes will require that the unused en-
trance holes be sealed and we believe that this is
the prudent and safest course of action.