This is only half an answer I'm afraid but it might be of some help anyway.
I bought a DC to DC converter recently from Super Cheap Auto. The input is 12V DC and the output is variable up to (I think) 19 which is what I wanted to run an old ASUS laptop - which it does very niucely thank you. I haven't got it near me at the moment so I can't tell you any more than that - but it may well be worth a quick visit to your friendly neighbourhood SCA sto0re.
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