True. Some do switch but those are the higher end higher priced models that
are only used in the really high end RVs.
And not all computer UPS units switch. the low end cheep ones converter and
invert continuously. Those are usually the really cheep ones that are prone
to failure under heavy load or surges.
--
Warren
1989 GMC R2500 HD Suburban.
1953 Airstream Cruiser Travel trailer.
Western KY
-----Original Message-----
> Not necessarily. Some convert/inverters change mode, supplying 12 volt
> when 120 is available, supplying 120 volts AC when only 12 volts DC is
> available.