12V 19Ah Motorcycle Battery to Supercapacitor

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SUMMARY

The discussion centers on the feasibility of replacing a 12V 19Ah Lead Acid Battery in a Harley-Davidson '09 FXDF with a supercapacitor. The calculations indicate that a supercapacitor would need to be rated at approximately 5,700F to match the energy storage capacity of the battery. However, it is established that traditional capacitors, including supercapacitors, cannot maintain a consistent voltage during discharge, making them less practical for this application. The conclusion is that the high capacitance required and the cost implications render this replacement impractical.

PREREQUISITES
  • Understanding of electrical capacitance and Farads
  • Basic knowledge of Lead Acid Battery specifications
  • Familiarity with supercapacitor technology
  • Mathematics of energy storage (Coulombs, voltage, and amp-hours)
NEXT STEPS
  • Research supercapacitor voltage stability during discharge
  • Explore alternatives to Lead Acid Batteries for motorcycles
  • Investigate the cost-benefit analysis of supercapacitors vs. traditional batteries
  • Learn about energy density and power density in energy storage systems
USEFUL FOR

Motorcycle enthusiasts, electrical engineers, and anyone interested in energy storage solutions will benefit from this discussion, particularly those considering alternatives to traditional Lead Acid Batteries.

Ciphex
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The Lead Acid Battery in my H-D '09 FXDF is rated 12V at 19Ah. If I understand the math correctly, I would need a 12V capacitor rated to 5,700F. Is this accurate?

1 F = 1 As/V
1 Ah = 3600 As
19Ah x (3600As/1Ah) = 68,400As
(68,400As/12V) x (1F/[1As/V]) = 5,700 F

As I understand it, traditional capacitors are unable to deliver a consistent voltage as it's discharged or used. Is this also true of Supercapacitors? If my math is correct, this would seem like a futile endeavor considering the necessary capacitance and associated cost over traditional 12V 19Ah Lead Acid Battery.

Thanks!
 
Engineering news on Phys.org
68,400As = 68,400 Coulombs. The battery should be able to deliver this charge with an output voltage change of about 1 volt. Thus the supercapacitor should be

68,400 Coulombs/1 volt = 68,400 Farads.

Bob S
 

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