In an earlier contribution to this discussion,
Mark Trueman wrote:

Hi,

What is the best way to power a laptop from a car ciggy lighter
socket. The transformer for the laptop outputs 19volts, 3.16 amps.

What about powering a desktop printer. Is this possible or do i need a
generator.

Thanks

Mark

You could really do with a DC to DC converter with a 19v output - but
assuming that you're going to use the laptop's mains power supply, you'll
need an inverter to generate mains from 12v. You'll need something in the
region of 75 watts or more which, allowing for inefficiency, will draw
something like 7 or 8 amps from the cigar lighter socket. Best not to do it
for more than a couple of hours without running the engine. If you want to
run a printer as well, you'll need a bigger inverter - which will use even
more current. You'll have to work out what you need from the printer's power
requirements - and then check whether the socket can deliver sufficient
current.
--
Cheers,
Roger
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