7
Step #2: Wiring Inverter to 12 Volt Power
The power inverter requires connection to a standard 12 volt DC power source as found in most cars,
trucks, RVs and boats. The power source must provide between 11 and 15 volts DC. The power
source must be able to provide sufficient current to power the load. See the chart below that shows
minimal wire sizing and current draw at full load.
Wire Size Chart
Inverter Model Current at
rated power
Suggested
User Installed
12v Fuse Size
Suggested
Wire gauge,
less than-10’
Suggested
Wire gauge,
10’ to 25’
SPV-8
75 Amps
80 A
4 AWG
2 AWG
SPV-10
94 Amps
100A
2 AWG or
two 6 AWG
0 AWG or
two 4 AWG
SPV-15
140 Amps
150 A
2 AWG or
two 6 AWG
1/0 AWG or
two 2 AWG
SPV-25
235 Amps
250 A
2/0 AWG or
two 1 AWG
4/0 AWG or
two 2/0 AWG
Always connect the positive, red (+) terminal to the positive connection and the negative, black (-)
terminal to the negative or ground side of the power system.
WARNING
Failure to connect the correct polarity may cause damage to the power inverter
and/or your electrical system and is not covered by the warranty.
Temporary Wiring
The power inverter (except the SPV-25 because of the high current draw) comes with a set of jumper
cables to attach directly to your battery terminals for temporary usage. For permanent installation,
you should hardwire the power inverter into your 12 volt system as described below.
WARNING
When connecting cables, a spark may occur. This is normal. To prevent explosion
from the battery gasses, when connecting jumper cables, always connect the wires
to the inverter first, then connect the positive alligator clip to the positive (+)
terminal on the battery. Finally connect the negative (-) alligator clip to a solid
ground point on the engine.
Connect the red wire to the red positive (+) terminal on the inverter and the black wire to the black
negative (-) terminal on the inverter. Connect the red alligator clip to the positive battery terminal
and the black alligator to the frame or engine of the vehicle. Follow the instructions below and
proceed to Step #3 Testing the Power Inverter.
