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If you know how many amps your load draws then divide this into 26 and your answer will be the number of hours (approximately) you can sustain the load.
Divide 25,000 by the supply voltage to get the current.
Ib =Ic /beta beta is the gain factor of the amp.
A series circuit will produce more voltage. For example, two 12 volt automotive batteries both have a 600 amp capacity. Connect the 2 batteries in series and you will have 24 volts with 600 amp capacity. Connect the 2 batteries in parallel and you will have 12 volts with 1200 amp capacity.
Divide the watts by the voltage to get current (amps). 60W / 250V = about 1/4 Amp.