Okay, I'm back working on the 12 Volt television problem (challenge).
The LCD television came with a 120V to 12V adaptor.
I wired the TV to my 12Volt battery system (and put the adaptor in the drawer).
NOWHERE in the manual, or on the TV does it give an acceptable voltage range.
The adaptor, measured, puts out 12.5Volts
In battery mode only (fully charged battery, charger disconnected) the range is 12.9Volts- 12.1Volts, or thereabouts.
I feel completely safe operating the TV in battery mode, anywhere on that scale.
When the Deltran charger is hooked up to shore power, charging the batteries and providing power to the 12Volt appliances in the trailer, the voltage goes as high as 14.5Volts.
I am unwilling to take a chance on zapping the (not cheap) television.
As yet, mail to the company (in China) has not netted me an answer as to the acceptable voltage range.
So, I have two ideas, but seek input.
Idea #1 is to install a power supply, so that the trailer can be run on battery power, or converter power, controlled by a switch, allowing me to avoid the high charger voltage.
The power supply puts out 13.5Volts, a little high, but closer to acceptable, and more so once a load is placed on it...somewhere around 13V.
Idea #2 is to place 1 or 2 (1Amp) diodes in the line to the TV.
Starting with 14.5V, one Diode would limit the voltage to 13.8V, and two would bring it down to a very safe 13.1V.
Problem with this "fix" is that while it cures the high voltage from the charger, the diodes still act when the charger isn' part of the equasion, such as running on battery power only.
In that scenario, starting with 12.9V, the first diode brings voltage to 12.2, and the second brings it to 11.5.
That seems a little low, but then where are we when the battery bank is nearing 50% discharge...starting at say, 12.3V the two diodes drop the voltage to the TV to 10.9V
Seems like low voltage could cause just as much damage to the TV as high voltage?
Idea #3 is to use the supplied power source for the TV, but, that means switching the TV back and forth from battery power, to adaptor power.
Not an unreasonable thought, but if I have to switch back and forth, I'd rather throw the switch and have reduced voltage throughout.
My DVD player, LED's and future items will no doubt benefit from a more reasonable voltage.