MrWizard wrote:
Over many years I have tried out various 12v appliances
From bottle warmers to instant water heaters, to defroster / heaters
Fans and radios and tv worked
Everything that produced heat was a big Flop
I know there are travel blankets and such things
And some people have had good experience with them
But not me
I'll stick with 120vac items on an inverter
They use more power and there is conversion losses
But they do the job
As I understand it, an electric blanket consumes around 80 watts. This equates to only around 7 amps at 12 volts (when it's "on" ... but they cycle continuously, so AH draw averages less). What this means is that a 12 volt electric blanket (and mattress pad) should work far better than the 12 volt appliances you are referring to that require far greater 12 volt currents in an attempt to match the wattages of similar 120V AC powered household appliances.
A 12 volt powered electric blanket/mattress pad should functiton as good in an RV as a 40-50 watt TV functions in an RV. Inverter losses would thus be eliminated when using them night after night in an RV for comfortable drycamp sleeping so as to be able to maintain lower coach interior air temperatures ... and thus saving overall energy.