On Monday, 9 January 2023 at 05:37:13 UTC+1, Commander Kinsey wrote:
> I have 8 computers with 15 graphics cards running science projects. The graphics cards run from 12 volts, adding up to a lot of current between them.. I have three 1kW power supplies connected to a big bus bar and have set those power supplies to 12.6 volts, as the graphics cards expect 11.4 to 12.6 volts, so I'm playing safe and allowing the biggest voltage drop not to make it fall outside that range. Currently I'm close to the limit of the power supplies, and since the current draw of the graphics cards is uneven, I thought it would be a good idea to add a car battery (actually a 130 Ah leisure battery) to the bus bars, to help out if there was too much current draw momentarily. The power supplies are current limited so don't mind if I try to draw too much, they will just limit the current.
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> My question is, is it ok to have the battery sat at 12.6 volts? This is the voltage the battery sits at with nothing connected to it when it's 95% full. If the battery were to supply a fair amount of current for a while and become a little discharged, would it manage to charge back up with only 12..6 volts supplied to it? Or does it require a float voltage of 13.2 volts or more?
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