Battery Question ; time watching TV

tplife wrote:
Planning it out beforehand would provide a lot longer viewing time. The largest 12V HDTV would be the 32-inch Jensen, $ 417.55 new. An Optima or Lifetime or whoever's AGM battery would tolerate deep discharge and offer a lot of other advantages over an old-school lead acid as well. The 12V HDTV gets you away from inverters that waste a lot of power to convert, rather than a converter, which wastes a fraction of power vs. an inverter (i.e.; convert a 19V laptop to 12V).

32-inch Jensen HDTV

Yep, TV's all run on DC. That brick in the cord converts AC to DC. If it's not in the cord it's in the TV itself.

Planning it out beforehand would provide a lot longer viewing time. The largest 12V HDTV would be the 32-inch Jensen, $ 417.55 new. An Optima or Lifetime or whoever's AGM battery would tolerate deep discharge and offer a lot of other advantages over an old-school lead acid as well. The 12V HDTV gets you away from inverters that waste a lot of power to convert, rather than a converter, which wastes a fraction of power vs. an inverter (i.e.; convert a 19V laptop to 12V).

32-inch Jensen HDTV

We can come perdy close.
You are going to be drawing about 125 watts total incl inverter, tv and DVD
125 divided by 12 volts is about 10 amps from the battery. Having 50 AHs available from a 100 AH battery, you will go about 5 hrs

GordonThree wrote:
Lacking any information about the tv, dvd, battery or inverter, my educated guess would be "a while".

"a while" very cleaver. Most/all 35" TV's are about 35 watts but I think you knew that. Most DVR's are about the same. Thanks for your thoughtful response.

Add the amp draw of the two items and multiple the total by 10. That is approx how many amps you will draw from your 12 volt battery.

GordonThree wrote:
Lacking any information about the tv, dvd, battery or inverter, my educated guess would be "a while".

X2

Probably a few hours, but that would depend on the amperage draw combination of the TV, player and the inverter/converter.

Incidentally, you don't want to draw down the battery to less than 11.5 volts our you'll shorten its life considerably. Actually, two six volt batteries would last a lot longer as they tolerate deep discharge and recharging much better.

car camping and 35 inch flat screen TV does not compute??
bumpy

Lacking any information about the tv, dvd, battery or inverter, my educated guess would be "a while".