Sometimes small systems are plenty

mena661 wrote:

I keep saying this but the 12V TV crowd never has a response. I have yet to see a 12V TV draw LESS power than my off the shelf, 26" Vizio. If there is a 12V 26" LED LCD that draws less than 2A DC, I'll STFU about it.

Hmmmmmm .... here's the specifications for the VIZIO E261VA (click the TECH SPECS tab):

http://store.vizio.com/e261va.html

.... and it looks like it's power consumption is 33.8 watts which - if an inverter in an RV powering it was 100% efficient - it would be drawing about 2.82 amps of 12 volt current. Since inverters aren't 100% efficient, this TV would probably draw in the neighborhood of 3.52 amps from an RV's battery for each hour the TV was running.

My 26 LED LG 720P HD TV draws about the same, but this question remains: If I power my LG with a another DC-to-DC converter brick that makes 12 volts into 24 volts (the internal DC voltage required for my TV's circuits is 24 volts) so that I can plug it directly into an RV's 12 volt receptacle - would the current draw on the RV's batteries be less or more than powering my TV via it's existing brick and through my PSW inverter? (I bought my LG TV specifically because it's brick could be unplugged from the back of the TV and replaced with a DC-to-DC converter brick for use in the RV directly from a 12 volt receptacle.)

A more basic question is: Are modern small PSW inverters more or less efficient than modern DC-to-DC upconverters?