Also what most folks end up doing for convenience. It can be surprisingly inconvenient and expensive to source a power supply at 12v/24v/48v or whatever, and battery voltages are always nominal (think barely approximate), so you can’t get clean power regulated directly sufficient for running a computer. For instance, “12v” automotive voltages can vary from 8v to 15v during normal vehicle operation - like starting the vehicle, charging at full tilt on the highway, etc. a full battery can provide 13.7-14.8v depending on chemistry too.
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