Next up would either be the car itself, or the mid/highs amps if they were powerful enough. In most setups here people running big amps / subs, the amps themselves are obviously going to be the top draw on the electrical. I simply calculated the two biggest draws on the electrical). That would be a MAXIMUM possible load (For amps + car running, anything else would be too small to even bother calculating in. If you take my example into a real-world scenario, you would need no more than 532 amps. It's not about getting as small of an alternator as you can. Even more of a reason to get a rough calculation (like I did above^). I would agree that buying more is always better. I'm not trying to be a jerk here, i'm here trying to learn as much as the next guy. I don't see how if one wanted to calculate max load, that they wouldn't consider efficiency a valuable factor. I don't see how that would be anywhere near "15%." Could you explain further on why amp efficiency is irrelevant / "********?" It takes an amp X power to create Y power. What if i'm listening to Decaf music, where bass lines can be constant through the entire song? If Decaf stuff and a sine wave are recorded at the same level (say, -6 db), the bass amp would see, and produce similar results to the sine waves. (Not counting for other mids/highs amps, but it will usually be minimal)Ĭlick to expand.What is your source on the "music over time is about 15% the power of a sine wave?" Add that answer to (StockAltAmperageRating * 0.4-0.6) = Amount the car draws when running + a few accessories.Īdd the answers to both those and you get the maximum your entire vehicle could possibly draw at one time. So with a few batteries to ensure the voltage is stable, you can get away with a lot less alternator.įull equation: (AmpOutput / ExpectedAmpEfficiency) / AltOutputVoltage = Amount of Amps required to run that amp constantly. But we all know music isn't just a sine wave. This would apply if the amp was running a constant tone, like in competitions. You will need 532 amps of alt to sustain this amp constantly while running the car and a few accessories. It's going to consume 7142 watts to create that 5000 watts. This is not 100% accurate, just an estimate. Let's assume you're running it at 1 ohm, which we can estimate would give you about 70% efficiency. They're usually up to 90% efficient at high ohm loads. Class D amps by design are very efficient. You can estimate how much current (amps) it's going to consume by dividing input voltage (14.4) by rated output power (5000w)īut first, since no amp is 100% efficient, we need to figure out how much power it's going to consume, to create that 5000w. Let's say you're running a 5000w amp (RMS). 6 = 36a of power to run the car / maybe some accessories on. Your car should use about 40-60% of this during running / normal conditions.Ħ0 *. Dev.).You can do some math to ensure you have enough amperage. Most electronic components designed ty Tier 1 manufacturers meet PPB-parts per billion or 9 sigma (Std. Average and Mean power (RMS) means 50%+ of the time your system fails.ĭesigning to RMS means you do not even meet 1 standard deviation. Examples: Network bandwidth, memory bandwidth, electrical isolation, dielectric requirements, and wire/power trace current carrying capability. There are several places where averages and means are meaningless in engineering design. Reminder the input current drawn is based on the impedence of the input/output, efficiency of the power supply and load impedance rather than volume switch. Designing to the lowest requirement of system input and output, on only one corner of your testing requirement, you will never pass international standards for electrical component requirements. This is especially true when people use very low impedance speakers, which draws maximum current even at low voltage. If you use RMS and lowest current based on highest operating voltage, you will blow the wire when the system experience low voltage and high current output. Read international requirement for wire sizing, isolation distance, dielectric requirements, for UL, JEDEC, CE, TUV, Telcordia, MIL-PRF-38534, MIL-STD-883, etc. Click to expand.The wiring requirement is based on derating 80% of RMS current of lowest voltage in 4 corner electrical testing under full power delivery, which is closer to SINE wave peak value.
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