Audiovox MS-407 Owner's Manual page 12

This note will discuss DC Power sources and how
they relate to 12 volt DC audio/video products.
DC (Direct Current) Power
A large number of our products are designed for
12 volt DC applications. The power is supplied by
a variety of sources i.e., the battery, converters,
ignition systems and solar power.
General Specifications
Our general specification for the voltage range of
operation is 10 to 16 volts DC. TV's and VCP's
(video cassette players) require slightly more than
10 volts to function properly. Normally this 10.5 to
11 voltage requirement does not create a problem,
but keep in mind the following points:
APPLICATION NOTES
The voltage of a fully charged battery (engine not
running) is approximately 12.5 VDC. Once a load
(items being powered represent the "load") is
applied, the voltage will drop. How much the
voltage is reduced will depend on the following:
12
Voltage
1. Current draw (amount of amperage); the
higher the draw the greater the voltage
will drop.
2. This size and length of the conductor
(wire) supplying power.