windy
nation
Page 6 of 15
VertaMax User Manual
Revision 1
1) The VertaMax has two DC terminals, one positive and one negative. Red is Positive [+] and
black is Negative [-] and has the same polarity as the battery. When connected, positive
must connect to positive (red to red), negative connect to negative (black to black).
2) The inverter will ship with two alligator clamp style cables for temporary power connections.
If a permanent connection is desired, prepare adequately sized cables to connect the power
source to the inverter. The cables should be as short and thick as possible to reduce the
voltage drop between the power source and the inverter as it draws current from the power
source.
a) Inverter end of the cable: Terminate copper wire with a 0.3125” diameter, tin-plated
copper lug. It is recommended to cover the lug barrel with 1 inch of heat shrink tubing.
b) Power Source end of the cable: Terminated with a lug or other connector that provides
a secure, low resistance connection. For example, if the power source is a battery, the
cable must be terminated with a battery terminal that clamps to the post on the battery.
IMPORTANT:
If there is an excessive voltage drop and the voltage at the inverter drops
below 10 volts, the inverter will shut down.
IMPORTANT:
To properly size the wire, consult the Wire Gauge Chart in Section 4.3 to
safely determine what gauge of wire will be needed.
3) Wire the positive cable(s) through user-supplied UL-listed fuse (e.g. Buss Fuse ANL-50 or
equivalent) as shown below. The fuse should be as close to the battery as possible. The
specific fuse ampere rating should be sized to allow operation of all your DC powered
equipment but cannot exceed the maximum current (amp) rating of the inverter by more
than 40%.
4) Be sure the inverter power button is in the ‘OFF’ position and the DC Power source is also
off.
5) Connect the cable end with the 0.3125” lug to the Power Input Terminals on the DC Input
end of the inverter as shown below. The red terminal is positive (+) and the black terminal is
negative (-).
Use the washer and DC Post Caps (provided) as shown below. Fully tighten until the Cable
Lug is secured.
