Is there such a thing as a Magsafe 2 charging cable that can be used from a car's 12V power outlet (UK).
This is for a 2015 MacBook Pro.
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I tried to find this kind of product a few years ago. I could not find anything relevant. Nowadays, no more luck.
An inverter may be the only solution, although it may not be the best for you.
There are also integrated battery+inverter products like GoalZero Yeti but it may be too expensive or "over the top" depending on your needs.