If I turned the volume way up, the headlights would dim with the bass. For what it’s worth, when I went through this phase as a teenager (and it didn’t last more than a year and a half or so, then a window-rattling, thief-attracting stereo no longer seemed like a life necessity), I had a 600 watt RMS amplifier for a pair of subs in a Cavalier with a 95 amp alternator. The only reason to add a high output alternator is if you want bragging rights for installing one, and those would be pricey bragging rights. A high output alternator that is working correctly will not damage any part of your car’s electrical system. Adding a high output alternator probably will not, but it would help keep up with the power demand if you add on to what you currently have. Adding a capacitor will eliminate the light dimming issue you are having. Try to find a 240 amp alternator.If all you have for your stereo is a normal head unit (stock or common aftermarket) and this 1,000 watt amplifier, you will probably be okay with your stock alternator. You'll want an alternator with at least 25% headroom, but again, that's cutting it close go for higher if you can. "The inverse of efficiency of a Class D amp is around 1.25, though this can vary slightly. Im pretty good with most mechanical things, engines and mechanics, but electrical is my MAJOR weak point. it would only be a 20 amp difference and depending on its capacity, that would take quite a while for it to "run out of charge"? or am I looking at it wrong? Lets say im drawing 90 amps from the capacitor, and the capacitor is drawing only 70 amps from the battery. I just really dont wanna fry my amp and be stranded, thats not cool at all. some songs I pound hard, but my head/ears cant take it for more than 5-10 mins so I turn it down do a manageable volume. What if I just got a bigger capacitor that stores more energy? I push the subs somewhat hard on my 4 hour drives. a fully electric bus with no traditional batteries and no continuous external rail. Supercaps have weight advantage to batteries but not size, however they even make super caps big enough to power electric buses, they have public buses where they put overhead wires at bus stops and in the time the bus spends at each stop is used to charge the caps. They make supercaps in many coin battery forms. Most of my circuitry I use supercaps instead of a coin battery for clock backup, it will retain the clock settings without power for about a month and still work in 20 years out in my garage/greenhouse over the winters. The caps last decades, weigh nothing, and are maintenance free so its a trade off, but either way I have to kick start it so a traditional battery lost that battle. but when its off the lights go out after a few mins. if its on the lights work fine without being effected by RPM. Ive replaced batteries with caps in many cases, for example my dirt bike battery is now a bunch of caps. all it needs is a surge tank to help from running dry every once and a while. ![]() Your amplifier will burn up if it ran at 2k amps continuously, if you look at spec its only rated to do that a tiny fraction of the time and survive. In Car speak think of a cap as a surge battery, its just like a normal battery except it charges and discharges (near)instantly, full capacity, max amps, unlimited times. the principals are the same, and there is a reason why power supplies are loaded with caps (hint, smooth out surges) its just the peaks that its struggles, dont matter if your designing a circuit with a few milil amps at a 3v or hundreds of amps at 12v. Your system is not already taxed, it has enough capacity for the base load. did a fine job and let me charge my laptop in college. Ive used the internal caps in a large inverter before to get a 2k watt amp to stop effecting the head lights, just plugged into accessory port and left on. Alternatively if you have a really old vehicle with like a 60A alternator, then its taxed with a base load from a big sound system. trust me a cap will work better than upgrading your alternator, only idiots with a million subs need to do that crap. People in car audio forums rarely know what they are talking about. ![]() more so when you are pulling alot of direct current amps through a long power line at minimum required gauge, such as a subwoofer install. to clean up power so you get a clean and reliable source. There full of crap, this is what caps are used for in electrical engineering.
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