Xantrex XPower 1500 Owner's Manual - Automatic Protection:
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4. As the battery pack becomes nearly discharged, or empty, a
low voltage warning will sound. This will give you time to shut
down a computer, for example. If this warning is ignored, the
inverter will switch off automatically a few minutes later to
prevent battery damage. See below -
Automatic Protection:
Overload, Overheating and Low Battery
for details.
5. Fully recharge xPower1500s battery pack as soon as possible
after each use. See Section 7.
Automatic Protection: Overload, Overheating
and Low Battery
xPower1500 has built-in protection against output overload and from
overheating. If an AC product rated higher than 1350 watts (or which
draws excessive surge power at start up) is connected, or if the
inverter exceeds a safe temperature, it will automatically shutdown.
The green POWER light will go off and the red FAULT light will
switch on. To reset, unplug the product and turn the AC Outlets
Switch off for 5 seconds, then turn it back on. Normal operation
should resume. If not, turn the AC Outlets Switch off again and allow
xPower1500 to cool for several minutes. While AC power is off, press
the Battery Status Switch to make sure the charge level is sufficient.
If the battery pack is allowed to discharge excessively, damage may
occur. To prevent this, xPower1500 has a built-in audible warning that
alerts you when the battery pack is nearly discharged and that
recharging is needed. If this warning is ignored, xPower1500 will
automatically switch off the AC Outlets and the red FAULT light will
illuminate when the battery pack reaches empty. The FAULT light
will remain on until the AC Outlets Switch is turned off. Promptly
recharge xPower1500 to help maintain the internal battery pack. See
Section 7.
Interference with Electronic Equipment
Buzzing Sound in Audio Systems
Some inexpensive stereo systems and boom-boxes will emit a
buzzing sound from their loudspeakers when operating from the
AC output of xPower1500. This is because the power supply in
the equipment does not adequately filter the modified sine wave
produced by xPower1500. Unless the stereo can be operated
directly from xPower1500s 12-volt DC Power Socket, the only
solution is a sound system with a higher quality internal power
filter.