Using my 14v dc TV on 12v dc

[bridgedino]

So having watched Greg Virgoe take his 230v samsung smart tv and adapt it to use on 12v I then had a look at my own 19” samsung smart tv. Right enough its actually a 14v tv with a 230v adaptor.

A quick look on ebay for a 12v step-up adaptor seems to show only 2 options, either 13.8v or 15v. Is anyone out there clever enough to know if a 14v tv will work in 13.8v and / or is 15v too much?

Thanks

 

[Lenny HB]

13.8v will be fine.

 

[bridgedino]

Thanks

 

[donkey]

Are you sure it won't work from leisure battery. Certainly if on EHU it will be at anything from 13.6v to 14.4v approx.

Geoff

 

[DBK]

As a complete aside I've occasionally wondered why my radio equipment is designed to run on 13.8 volts. This is the default supply voltage for virtually all ham radio transmitters.

This thread has prompted me to investigate and apparently it is because 13.8 volts is the typical voltage of a freshly charged lead acid battery. The voltage will soon fall to around 12.5 but if equipment is built for 13.8 volts it will be safe if connected to a battery which has just been charged.

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[bridgedino]

On ehu i use it on the 230v. Want to try getting it to work via 12v if it works out,so its not restricted to just ehu use.

 

[pappajohn]

Before buying adaptors give it a try on the vans 12v leisure.
Chances are it will work but if the voltage is too low it won't cause any damage.

 

[bridgedino]

I did try it on a 12v cigar socket outlet. The red led standby light was illuminated however it wouldnt turn on. I figured it needed that extra few volts to get it turned on.

 

[Lenny HB]

As a complete aside I've occasionally wondered why my radio equipment is designed to run on 13.8 volts. This is the default supply voltage for virtually all ham radio transmitters.

This thread has prompted me to investigate and apparently it is because 13.8 volts is the typical voltage of a freshly charged lead acid battery. The voltage will soon fall to around 12.5 but if equipment is built for 13.8 volts it will be safe if connected to a battery which has just been charged.

More likely due to the way we used to charge LA batteries. A fully charged battery just off charge is nominally 13.0 —13.2v.
Battery chargers use to be charged to 13.8v as this is the was the maximum voltage you could charge a battery to and leave connected to the charger without it gasing off.
And the reason batteries only used to last a couple of years as they never got a full charge at 13.8v.

Modern multistage chargers take the voltage up to 14.4v then go into an absorbtion phase where the voltage is held at around 14.v and the current limited normally to an amp or less for a few hours (time dependant on battery type). This ensures a full charge be for dropping to a maintance float voltage of 13.6-13.8v