On the RC7 remote, press and hold the on/off button for a few seconds. If it still beeps at you something is not the same as mine.
Do you see the green light flickering on the remote?
You can also just turn the switch on the actual inverter to "off".
Do you have the Xantrex manual...it does a pretty good job of explaining how everything works but it does take some practice.
If you do not have the manual, go online to see if you can find it from manufacturer.
2016 Arctic Fox 25Y (For Sale), 2016 F350 4x4 DRW, 6.7
2008 Mobile Suites RE3: Sold
2005 Monaco Dynasty Diamond IV: Sold