A laptop car charger can be quite useful in powering up a laptop, especially when waiting in your car for extended periods. Such chargers are plugged in directly into the 12V DC port, and can power almost any laptop, as it steps-up the car system voltage of about 12-14V to 15-24V. The 5-ampere ComOn DC-to-DC converter (MW2173) is quite robust, I’ve purchased mine back in 2008 (ten years ago)!
While an inverter—a device that converts 12V DC to 220V AC so you can plug in a laptop 220V AC charger—may be used to power laptops, too, I find no sense in converting DC voltage to AC, then converting the AC back to DC :)
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© Anthony Urbano (Manila, Philippines)