"David Nebenzahl" wrote in message
.com...
Dave D spake thus:

"tommaz" wrote in message
ups.com...

Just so I'm clear - if I use the 12 volt leisure battery in my caravan
(hence the restricted space), then all I have to do is wire the TV and
digibox direct to the 12 volt supply?

Your LCD and digibox will likely want a very stable 12V supply, and a
battery will not offer that. Unless the appliances are explicity designed
for battery use, forget it. They will simply malfunction when the battery
starts to deplete, or worse it may cause damage.

Damage from *undervoltage*?

Please be so kind as to explain how this could possibly happen.



TFTs often have small onboard SMPSs to drop the 12V down to 5V and sometimes
other voltages as well. SMPSs can pulse/cycle when the input voltage drops
below a value at which they can maintain a stable output, which can damage
the SMPS itself or the rest of the panel's electronics.

HTH.

Dave