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3000 Farads by itself isnt enough to go by. We'd also have to know the voltage rating. That would tell us how long we could charge it at say 1 ampere.
No good keeping it in your spares box then. By the timeyou get round to using it its capacity will have dropped to 3000μFit loses up to 900F sitting on a shelf for 20 days
see data sheet:stantor: What do you mean it loses 900F ?
their biggest ones are 4000 F 2.7 volts with a discharge current rating of something like 4050 amps!
are you referring to the ones OP linked to? or some other model that has bus bar connections?