When I bought my previous coach the salesman said to leave the inverter off and just turn it on "to watch tv for a little while occasionally". He said that is what everybody does. Like I said that was a coach and awhile ago. Since then I have a bit more miles and experience but the kicker was attending a Dimension seminar with sales, service and engineers from the company. They recommend leaving the inverter in Auto or Standby mode. Of course that assumes you have enough battery to last when not charging. That way you have a source of "uninterpretable" power. Easier on electronics, etc. For that reason I would probably agree with the above and say left.
Tom, Cheryl & Blossom(coonhound mix) Formerly of Bellingham,WA'05 Winnebago Journey 36G. FL-XC, Cat 350, aero muffler, AFE filter, 4 FSD Koni's, ultra track bell, SafeT+, FMCA397030, WIT 129107