Mailinglist Archive: opensuse (1620 mails)

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Re: [opensuse] UPS : replacing battery with 12 volt Jelly Car Battery
On 11/25/2014 12:51 PM, Anton Aylward wrote:
You can power a 19 volt laptop from 2 car batteries for many days
on end. All you need is a LM7809, which will set you back $1.95 plus
Which begs the question ... If everything runs on 5V (the electronics)
and 12V (motors, burners), then why is 19V needed?

The computer has an internal power supply that converts the more or less
standard input voltage to what's required by the computer. This also
includes voltage regulation to ensure the equipment runs properly.
Otherwise, you'd need a battery that provides 5V and another for 12V and
then try to keep them both charged by the same amount.

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