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Battery Capacity

Battery Capacity. David Cowan Daniel Shaw. Battery Capacity. The duration of time which a battery can withstand a constant draw of one Amp while maintaining a constant voltage (output) Battery Capacity quantifies the amount of useable energy that a battery can store . Units.

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Battery Capacity

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  1. Battery Capacity David Cowan Daniel Shaw

  2. Battery Capacity • The duration of time which a battery can withstand a constant draw of one Amp while maintaining a constant voltage (output) • Battery Capacity quantifies the amount of useable energy that a battery can store

  3. Units • Battery Capacity is expressed in units of Amp hrs Time in hrs of a full discharge Constant discharge

  4. Units • The total efficiency of a battery is expressed in Watt hrs Battery Capacity Desired Output in Volts

  5. Available Capacity (Puekert’s Law) Peukert’s Constant (only for lead acid batteries) *not spring constant!* * Puekert’s Constant is always Current of discharge Time in hrs of a full discharge

  6. Battery Arrangement • Battery Capacity is additive when batteries are arranged in parallel but not when arranged in series Doubled Output Doubled Capacity

  7. Battery Arrangement However, if you arrange multiple batteries in a way so that you have a series of parallel batteries, then you can double both the output and the capacity

  8. Battery Gassing • One of the dangers of having an EV with a Lithium Ion battery is; battery gassing. Battery gassing occurs when you overcharge the battery. This leads to thermal runaway which is essentially when your battery heats up so much that it explodes

  9. The ZAP Car • Our ZAP car has six 12V Absorbent Glass Mat (AGM) deep cycle Lead Acid Batteries which take 100hrs to fully discharge

  10. The ZAP Car

  11. The ZAP Car

  12. Battery Efficiency • For our ZAP Car Time it takes to fully discharge at this this rate Rate of discharge

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