Peukert's Law
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Peukert's Law
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Actual Capacity = C * (C/(I*H))^(k-1)
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C is rated capacity
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I is current drawn
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H is rated draw time in hours
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k is Peukert Constant
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Comparing 20Ah LiFePO4 with AGM
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LeadLithium
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C (Ah)2020
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Rated Hours200.5
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k1.151.01
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Weight (LB)146.6
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Discharge AAGM AhLiFePO4 Ah
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12020.139111
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218.0250092520.16006094
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515.710300620.18778871
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1014.1589156920.20878929
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1513.3234380520.22108396
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2012.7607293120.22981171
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2512.3406772520.23658407
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3012.007754720.24211918
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3511.7332895720.24680022
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4011.500613220.25085601
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4511.29921120.25443413
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5011.1220410820.25763541
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5510.9641657520.26053176
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6010.8219944820.26317628
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6510.6928381220.2656093
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7010.5746326620.26786219
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7510.4657608420.26995981
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8010.3649329620.27192219
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8510.2711047120.27376574
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9010.1834191420.27550404
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9510.1011647620.27714847
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10010.0237446720.27870865
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