5
Attach 5/16 inch ring terminals to the ends of the cables to be attached to the DC terminal studs on the PROwatt
1500. The ring terminals must be crimped with a proper crimping tool. Another option is to use Ilsco or
equivalent box-lug terminals ( available at electrical parts suppliers ) sized for the wire gauge and a 5/16 inch
stud. The bare cable end is inserted into the lug terminal and secured with a set-screw.
The other end of the cable, which is connected to the power source, must be terminated with a lug or other con-
nector that allows a secure, low resistance connection to be made to the power source. For instance, if the power
source is a battery, the cable must be terminated with a battery terminal that clamps to the post on the battery.
A solid, low resistance connection to the power source is essential for proper operation of the PROwatt
1500.
3.3 Test Loads
Use only equipment rated for 110-120 volt, 60 Hz AC operation that has a power consumption of 1500 watts or
less. We recommend that you start with a relatively low power load, such as a 100 watt lamp, to verify your test
set-up before trying high power loads.
3.4 Connections
Follow the connection sequence described below.
STEP 1 Ensure that the ON/OFF switch on the PROwatt 1500 is in the OFF position. If the power source is a
DC power supply, switch it off as well.
STEP 2 Connect the cables to the power input terminals on the rear panel of the PROwatt 1500. The red termi-
nal is positive (+) and the black terminal is negative (-). Place the cable connector (ring terminal or box
lug) on the stud and then install the supplied lock washer and nut. Tighten the nut with a wrench to a
torque of 9 –10 ft-lbs (12 – 13 Nm).
STEP 3 Connect the cable from the negative (black) terminal of the PROwatt 1500 to the negative terminal of
the power source. Make a secure connection.
CAUTION! Loosely tightened connectors result in excessive voltage drop and may cause overheated wires
and melted insulation.
STEP 4 Before proceeding further, carefully check that the cable you have just connected connects the negative
terminal of the PROwatt 1500 to the negative output terminal of the power source. Power connections
to the PROwatt 1500 must be positive to positive and negative to negative.
Figure 3. Connections to the PROwatt 1500