Mailinglist Archive: opensuse (1620 mails)

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Re: [opensuse] UPS : replacing battery with 12 volt Jelly Car Battery
On 11/25/2014 02:22 PM, Anton Aylward wrote:
The question was "why 19VDC?"

You'll have to ask the whoever designed the computer. I have seen other
voltages, so there's nothing sacred about 19V. However, you'll
generally find higher voltages with higher power devices. One advantage
to using a higher voltage is lower resistance losses. If the target
voltage were provided by the power supply, you'd have to worry about how
much the voltage would drop in the wires. A lower voltage means higher
current for the same amount of power, but the higher current increases
the resistance losses. On the other hand, an on board regulator
eliminates most of that issue and if the voltage sensor is right at the
load, eliminates it.

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