Xantrex Technology 400R - Manual (Page 34)

Operation
3-8 975-0162-01-01
Operating 12 V DC Appliances
The XPower Powerpack can operate 12 V DC auto, RV,
marine, or other portable appliances that draw 12 A or less
from a 12 V DC power outlet or from a vehicle’s lighter
socket.
CAUTION Equipment damage
The DC Power Socket does not automatically switch off when the
internal battery is discharged. To protect the internal battery against
damage resulting from total discharge, We recommend that the AC
Outlet On/Off switch is turned On when using the XPower
Powerpack to operate a 12 V DC appliance.
Having the AC Outlet On/Off switch turned On enables the alarm
to warn you when the 12 V DC appliance has nearly depleted the
internal battery.
Note :
The fewer watts a 12 V DC appliance draws, the longer
the XPower Powerpack will operate before recharging is required.