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Chapter 2: Installation
Connect the negative terminal of the Battery to the – Bat terminal
on the Skymetry WTU-14.
Figure 5: Battery connection
The battery is considered low at 12.0V and the Battery LED will
blink at this voltage level. If main power is less than 7.0V and the
battery voltage reaches 11V, the battery LED will go out and the
unit will go into hibernation mode (a low-power mode in which the
unit shuts down). The unit will return to its regular operating mode
when either the main power is restored or the battery voltage rises
above 11.5V . If the battery voltage continues to fall below 10.5V, the
unit will disconnect the battery to prevent deep discharge damage to
the battery. The unit will not reconnect the battery until the battery
voltage rises above 12.5V.
Grounding
Connect a #14AWG copper wire to the earth ground terminal
(marked "EG") on the left end of the terminal strip and connect the
other end to a ground rod or metal cold water pipe (See Figure 6). It
is extremely important that the earth ground connection be as short
as possible. The ground rod should have sufficient depth to provide
a low impedance connection to earth. This connection is required
for the surge/lightning protection circuits to function properly.
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