Quote:
Originally Posted by gpsman1
Have no fear... you can pull more than 100 amps off the 12v side of things, as long as you have the car "running" and able to recharge with the gasoline engine turning the "alternator". Actually, technically, this car has TWO alternators... one in the 94 kW range, and one in the 40kW range... but for some STRANGE reason, everyone calls them "generators". But they are AC with rectifiers to charge the big battery, and then the big battery can charge the little 12v battery any time the key is in run.
The 12v battery only powers your radio ( directly ) when the key is off or to ACC. In "run" the big battery powers everything.
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This last sentence is misleading, maybe terribly so. All 12 volt devices will be powered by the 12 volt buss, itself primarily powered by the 12 volt battery with the DC-to-DC down converter serving only as backup when the battery is sub-standardly charged.
All things considered I doubt of the down converter supply capability will be much more than the expected FULL twelve volt load current plus a little to provide for a reasonable battery recharge rate.
If I wanted a terrific sound system outside of being parked inside my garage with the engine off and the winddows rolled up I would probably start with a good deal of sound insulation, undercoating within the wheel wells, nice and quiet and comfortably riding summer only tires and maybe an "anti-noise", noise canceling system under the driver's seat.
As an alternative a bit of digital signal processing might help. Pre-process all of the sound content so everything is above the average noise level of the interior of most vehicles traveling down the highway at cruising speed. That would generelly be above 70Db.