Greetings from the US,
I am going to upgrade my stereo and am trying to find out the max RMS wattage I can install without putting too much strain on the stock 100A alternator.
I read that typically a car needs 60% of the alternator output for normal operation, so that would leave 40A @ 14.2 Volts =568W.
If I get class D amps then they are 75% efficient so after the loss that leaves 568W x 75% = 426W
I am looking at 6.5" components up front rated at 60-70W RMS and 6.5" coaxials in the rear also rated at 60-70W RMS. The sub I am looking at is 250RMS but I don't think I will have the gain up that high.
This all adds up to about 500W RMS which 75W above my calculated max.
I don't want caps or extra batteries, but I plan on doing the big 3 upgrade (larger battery to earth, Alternator to battery, and engine to earth wires)
Has anyone put in a system with more than 425W RMS without having to upgrade anything but the big 3?
On a separate note I read that the connects2 lead does not give an ignition switched 12V when the key is in accessory position (first click) Is the ignition live from the spare accessory cig outlet live in the accessory position?
Thanks for the help in advance, this forum has already been such a resource.