love4theluv wrote:
thank ya egg
would i be safe in estimating 1/3 of the peak as a constant draw? if so im looking at 41amps with the addition of a 500w amp for mids and the second of my two 10s added run off the 1000w.
1500w/3= 500w/12v= 41.66A constant. still safe with a 50amp but close to the line if additional load is put on. i know my nissan 60amp fits with a few washers added and a longer bolt, going to throw that on just to be safe and pick up a new battery asap
thank everyone for the input, sorry to be a pain with the questions

To be honest, the peak rating is just a number. They could claim that the peak rating is 50,000 watts and the RMS rating is 500w, and the most it'll do is around 500w.
The total impedance of the speakers per channel will dictate if it can even reach the RMS. A lot of amps will claim to put out 500w at 2 ohms, but the amp won't be rated at 2 ohms continuous usage. If you're running one sub per channel, and your subs are 8 ohm speaker (like just about every other sub) then the MOST you'll pull is about 150w.
I wouldn't worry too much about your charging system. More amps is good if you can make it work, and if you want to make sure it'll keep up at idle, you can swap the pulley for a larger one so it'll spin faster at idle. A good battery will solve your problems.