PT-100 Manual

Page 37

Installation

2.7.8 Terminal Block Connections

The charge controller provides a four-pole, high power (125 amps), 600-volt rated, DC terminal

block and a ground busbar to connect the PV input and battery output wires. Each connection on

the terminal block is rated up to 75°C and can accept one #20 to 1 AWG (0.5 to 42.4 mm

) wire.

Use a #2 Phillips head screwdriver to tighten each connection to a recommended tightening torque

of 30 in lbf (3.4 N-m).

The ground busbar uses ﬁ ve slotted head screw-type compression terminals (no ring lugs required)

and accepts CU stranded wire. Three of the terminals use a small 10-32 screw, and the other

two use a larger 5/16-24 screw. See Table 2-7 for the acceptable wire sizes and recommended

tightening torque values for these screws. Note: Two Torx head screws on each end of the busbar

are used to hold the ground busbar in place, DO NOT remove these two screws.

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.

Info: The charge controller’s PV- and BAT- terminals are electrically connected to each

other internally and either connection can be used for the input or output negative.

Figure 2-17, Wiring to DC Terminal Block

BATTERY

BANK

WIRING

COMPARTMENT

(PT-100)

TO SYSTEM GROUND

[Grounding Electrode

Conductor (GEC)

connection point]

BAT+ BREAKER

PV DISCONNECT

WIRING LEGEND

EGATIVE (-)

OSITIVE (+)

DC G

ROUND

BTS

BATTERY ENCLOSURE

OMBINER

RRAY

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