Hello. If my math is way off please forgive me...
My car (Corolla) has an 80 amp alternator and will have a 36R glass mat battery. Stock 10 gauge ground wires have been replaced with 6 gauge battery cables.
I am currently running a Alpine MRP-M500 (500w RMS 1000w Peak) amplifier and a Kenwood head unit. I typically run it at loud but not super loud volume, maybe 70% max?
So i figure my usage is...
+80 amp alt
- 4 amps A/c
- 3 amps blower
- 6 amps cooling fans
- 9 amps headlights
- ~8 amps ECM, gauges, dash lights, & misc
- 6 amps headunit
- 30 amps sub Amp (500w RMS @ 13.5v with 15% efficiency loss & ~70% volume)
_______________
+14 amps free
14 amps x 13.5 = 189w free
If I add a 45w RMS x 4 channel amp...
45w RMS x 4 @ 13.5v with 35% loss (a/b) 70% volume = 12a (162w)
66A + 12A = 78A MAX...
Close... but I should have enough power right? (I'm not running test tones or rap music so I assume power usage will be less than calculated.)
