Xantrex Technology 1000 - Manual (Page 37)

Operation
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Operating Several Loads at Once
If you are going to operate several loads from the XPower 1000, turn
them on one at a time after you have turned the inverter on.
Turning loads on separately helps to ensure that the inverter does not have
to deliver the starting current for all the loads at once, and will help
prevent an overload shutdown.
Turning the Inverter Off Between Charges
The XPower 1000 draws less than 300 mA from the battery with the On/
Off switch turned on and no load connected, but left in this state the
XPower 1000 will eventually discharge the battery.
To prevent unnecessary battery discharge, turn the XPower 1000 off when
you are not using it.