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Car Audio Battery Calculator
Calculate the perfect Evolution Lithium battery bank for your car audio system
System Information
Total RMS of all amplifiers (Watts RMS)
Typical LTO range 14.8–16.0 V (V)
Alternator rating at cruise (Amps)
Lights, ECU, fans, etc. (Amps)
Max Power Rating (Calculated)
Sustained Watts @ Cruise (bank + alt)—
Sustained Watts @ Idle (bank + alt)—
Bank-Only Continuous Watts—
Bank
Recommended Bank—
Total Capacity—
Configuration—
Peak Current
Full Tilt @ 75% Amplifier Efficiency—
Alternator Load Analysis
Idle Alternator (60%)—
Cruise Alternator (100%)—
Battery Supplements (Bank Must Supply)
Idle • Peak Load—
Idle • Music Avg (40%)—
Cruise • Peak Load—
Cruise • Music Avg (40%)—
Power Delivery
Bank Continuous—
Bank Burst (≈30s)—
Required Capacity (30s • Peak)—
Required Capacity (30s • Music Avg)—
Car Audio Battery Calculator
Calculate the perfect Evolution Lithium battery bank for your car audio system
System Information
Enter all fields first to enable calculation.
Combined RMS wattage rating of all amplifiers
Tip: add the RMS of every amp — don’t use peak/PMPO.
Typical: 14.8–16.0 V for LTO systems
Maximum rated output of your alternator
Lights, ECU, fans, etc. (often 30–50 A)
Choose Bank
Presets unlock after all inputs are provided.
Recommended Solution
Bank—
Total Capacity—
Configuration—
Peak Current (full tilt @ 75% amp eff.)—
Alternator Load Analysis
Idle Alt Available (60%)—
Cruise Alt Available (100%)—
Battery Supplements (Bank Must Supply)
Idle • Peak Load—
Idle • Music Avg (40%)—
Cruise • Peak Load—
Cruise • Music Avg (40%)—
Power Delivery
Bank Continuous—
Bank Burst (≈30s)—
Required Capacity for 30s Peak—
Max Power Rating (Calculated)
Sustained RMS @ Cruise (bank + alt)—
Sustained RMS @ Idle (bank + alt)—
Bank-Only Continuous RMS—
Sustained RMS = (bank continuous + alternator available) × V × 0.75 (no caps applied).
Calculation Methodology
- Amplifier efficiency = 75% for DC current draw
- Alternator modeled at 60% (idle) and 100% (cruise), minus vehicle draw
- SCiB LTO banks modeled 6S (≈14.8–16.0 V), 40C continuous, 75C burst
- 30-second burst check validates peak current capability
- No guideline caps: outputs are pure calculations
Custom build? Contact us.