©
2017 Sensata Technologies
Page 38
Installation
2.7.9
Steps to Wiring the PT-100
The following steps are basic guidelines for connecting PV and battery wiring to and from the PT-
100 charge controller. Remove the four Phillips screws on the wiring access cover to access the
terminal block (see Figure 2-2). Refer to Figure 2-17 while making the connections.
WARNING
: Before making any wire connections, make sure the charge controller is
not connected to the battery and there is no PV power (cover all panels and open all PV
source breakers/fuses).
DO NOT close the PV or battery circuit breaker to connect power to the charge controller
at this time. This will occur in the
Functional Test
after the installation is complete.
CAUTION
: The PT controller is NOT reverse polarity protected—i
f the positive line
is connected to the negative terminal of the charge controller and vice versa, severe
damage will result
and will not be covered under warranty.
Verify the correct PV and
battery voltage and polarity using a voltmeter
BEFORE
connecting.
Wiring the charge controller PV input
1. Route the PV output wires (PV Ground, PV Positive and PV Negative) from the PV combiner to
the charge controller.
2. Connect the ground wire (green or bare copper) from the PV combiner to the charge controller’s
ground busbar.
3. Connect the positive wire (red or black) and the negative wire (white) from the PV combiner to
a dual-pole dedicated PV breaker (ensure the breaker is open), then to the charge controller’s
PV+ and PV- terminals.
Note:
The PV wiring may require an OCPD at the PV array and a separate service disconnect
at the controller’s input.
Wiring the charge controller battery output
1. Route the battery wires (ground, positive and negative) from the charge controller to the
battery bank.
2. Connect the ground wire (green or bare copper) from the charge controller to the battery
ground terminal.
3. Connect the positive wire (red or black) from the charge controller to a dedicated battery
breaker (ensure breaker is open) then to the battery positive (+) terminal.
4. Connect the negative wire (white) from the charge controller to the battery negative (-) terminal.
Note:
If installing a battery monitor such as the ME-BMK, install a DC shunt in-line with the
negative battery cable.
Info:
Ensure the connections to the batteries are
fl
ush on the surface of the battery
terminals, and the hardware that is used to hold these connections (i.e. split/lock washer
and nut) are stacked correctly (see Figure 2-19).
2.7.10 Wiring the Battery Bank
WARNING:
Lethal currents will be present if the positive and negative cables attached
to the battery bank touch each other. During the installation and wiring process, ensure
the cable ends are insulated or covered to prevent touching/shorting the cables.
Depending upon the voltage of the batteries you use in the installation (6 or 12 VDC), the batteries
must be wired in series, parallel, or series-parallel to provide the correct voltage. Once the battery
connections are completely wired and tested, cover the terminals with an approved anti-oxidizing
coating.
Place the batteries as close as practical to the charge controller, preferably in an insulated and
ventilated enclosure. DO NOT mount the batteries directly under the charge controller. Allow
adequate space above the batteries to access the terminals and vent caps (as applicable). Also,
allow at least 1” (2.5 cm) of space between the batteries to provide good air
fl
ow.
Info:
To ensure the best performance from your charge controller system, batteries should
be of the same size, type, rating, and age. Do not use untested batteries.