User`s manual

page 7
Overview of the Power Inverter
The STP-600 power inverter is an electronic devices that converts
the low voltage 12 VOLTS DC from a battery or other power
source to 115 VAC to run standard household appliances.
See the section on How it Works to learn more about the
technology used in this power inverter.
DC Side (12 VOLTS Input)
AC Side (115 VAC Output)
Figure #1, DC and AC Sides of the STP-600