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You don't need to buy an inverter and use the AC power adapter to charge this. Simply use a USB-PD car charger. The one I link as recommended will charge the laptop but not as fast as it possibly can. You could look elsewhere for one that outputs at least 45 watts out of the USB-C port.
I would recommend:
Sorry, there was a problem. Please try again later.The Lenovo Chromebook 3 14 model number 82KN0001US, ships with a standard, Dual Voltage AC adapter/Charger - 45W USB-C (3-pin) US Compatible wall side plug. You will need a cigarette lighter adapter that will provide a standard 3-pin wall outlet plug receptacle like this one, there are others available, this is one example: https://www.bestbuy.com/site/scosche-150w-mobile-power-inverter-black/6473398.p?skuId=6473398
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