Xantrex Technology Solar 400 - Manual (Page 18)

Introduction
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The DC Socket is protected by a thermal switch. If an
overload condition (> 144 W) occurs while using the DC
Socket, the excessive temperature will cause the switch to
open and shut down the power to the socket.
Overheating
The Powerpack Solar 400 is protected from overheating. If
the inverter exceeds a safe temperature, power to the unit
automatically shuts off. It will reset automatically after the
unit cools down.
Low Battery Protection
Low battery protection protects the internal battery from
excessive discharge and possible damage. An audible alarm
alerts you when the internal battery is nearly discharged at
11.0 Vdc and the unit turns off at 10.5 Vdc.