On 2014-10-25 19:47, lynn wrote:
On 25/10/14 19:15, Lew Wolfgang wrote:
On 10/25/2014 10:09 AM, Billie Walsh wrote:
You could put several 12 volt batteries in parallel and connect to your UPS.
I was always taught not to do this. The internal resistance of batteries is so low that if they're connected in parallel one will discharge through the other. I remember seeing diode terminals that could be used to allow parallel connections for deep-discharge battery applications.
Well, you can... but not the whole battery, better cell by cell, and of the same capacity, model and age, and state of charge. And then you have to watch that a cell doesn't degrade more than another. Diodes? Yes... but you waste half a volt. At the current levels during mains failure, it is important (5.4% important). Better switch battery banks.
You can only use diode terminals with openSUSE <= 12.2, after that you must upgrade at least the negative terminal to systemd.
ROTFL! X'-) -- Cheers / Saludos, Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar)