How big a battery for a portable ( bike) sound system?
Have several amps and several speakers...
1 The most modest: a 2.1 computer sound system, probably ca. 5- 10 W RMS, 18 V
(I want to connect this to my 18 V portable drill batteries- how much run time ?)
2 The medium size: a 12 V (2, or one) 16 A fused: 2 average 9 x 6 car speakers
3 The meanest: A big 4 channel amp, bridgable, 12 V, fuse is 36 A, a big sub and 2 average 9 x 6 car speakers
Volume is determined by the MP3 player, I hope being able to make it, amp inputs are selected by a passive crossover
I like the volume loud, but not extreme (< 100 dB).
Runtime 5 - 3 hrs.
How big a (car) battery I would need for solution 2 and 3 ?