Power Support Calculator

Electrical System Power Calculator

Electrical System Power Calculator

Total Supported Wattage: -

Alternator Amperage Info

When entering your alternator’s amperage, remember that not all of the rated output is available for your accessories. The engine typically uses about 60% of the alternator’s output. For example, if you have a 100A alternator, the engine might draw roughly 60A, leaving you with around 40A available. For a 300A alternator, subtract about 60A to estimate around 240A available.
More on alternators (Wikipedia) | Additional info on our site

Amplifier Efficiency Info

Amplifier efficiency is the ratio of power delivered to your speakers versus the power drawn into the amplifier. We use a default of 80% as a balanced estimate. However, this can vary—lower-end (Chinese) boards might run at around 60%, Korean boards closer to 80%, and high-quality Brazilian boards can reach up to 90%.
Learn more about audio amplifiers (Wikipedia) | Detailed guide on our site