Electrical Power Calculator

Calculate your electrical system's capacity to support your amplifiers

Alternator(s)

Output (Amps)

Quantity

Use your alternator's rated output, not max output

Ah×

System Voltage

Amplifier Efficiency

Enter your amplifier's RMS power to see if your electrical can support it

Watts RMS

Continuous PowerSUSTAINABLE

0 W

0 A × 14.4V × 80% eff

Burst Power (1 min)SHORT TERM

749 W

65 A total (alt + battery burst)

Alternator Output:0 A

Total Battery Capacity:65 Ah

Battery Burst Current:65 A

lead:65 Ah

For systems over 1000W, upgrade these cables to 1/0 or 4 AWG:

Continuous reflects steady-state output from your alternator(s)—the ceiling for sustained RMS draw.

Burst factors in battery discharge during transient peaks. Lithium chemistries dump current far faster than lead-acid, so burst numbers climb.

Headroom (20%) keeps voltage stable when the bass drops. Without it, lights dim and amps clip.