Hi I posted a new thread about the box I want to build if you can check it out and let me know what you think.
Im planning running a 250 hcca and a 425 hcca I was going to get a 160 amp alt. I have like a 55 amp now and I was going to run 4 ga. wire for power and grounds how much are those batteries? I can get a volt meter also what am i looking ? if my alt goes bad and drops below 12 I need to shut them off? should these thing be good to run my amp? Jason
It is not the life of the Alt you should worry about, but the life of your amps and subs from low voltage.
It takes power to make power. Your amps are a Class A/B, which while I consider them a better amp, they are not as efficient as the Class D at full output....not even in the same ballpark. When running pretty hard, the amps will be consuming a lot more current than your alt can supply. The batteries are going to be drained over time, depending on how hard you are playing. The normal flooded cell type deep cycle batteries(imagine big boat batteries) are designed to be drawn down deeper and brought back to full charge more than a regular starting battery, but they are huge batteries. The AGM (Absorbed Glass Mat)type of deep cycle battery has similar, or more current capacity than the flooded cell deep cycles in the same size case as a regular starting battery.
The AGM's are best suited to car audio, not only for their size to capacity ratio, but in their ability to be brought back to full charge quicker, allowing your alt to keep up longer. Your voltage should be kept up well above 13v when the engine is running and you are blasting away. This is where the HO alt comes in, even a 160a alt is not going to keep up with both Orions blazing and your truck running down the highway at night,
unless you have a healthy and efficient battery and large enough wiring throughout. The big three (Alt to Batt +, batt to frame - and engine block to frame-)should be done with 0ga wiring. You need to run 0ga from the front battery to either a distribution block and split off to
2ga for the bass amp and
4 ga for the highs amp, or both + and - 0ga to a second batt located near the amps.
With the volt meter, you will see you voltage falling, depending on how hard you are playing and you can back off on the volume as needed to allow the electrical system to keep up. The 160a alt will be good, but as a factory alt, the idle current may be weak. I know this may seem like a lot to soak in, but it beats the heck out of a blown amp, sub or both.