Let’s consider a fully charged Lead-Acid battery pack, as shown below. If the ac
ID: 1716022 • Letter: L
Question
Let’s consider a fully charged Lead-Acid battery pack, as shown below. If the actual discharge current is 2 A (constant rate), please use Peukert’s equation to estimate the actual time to discharge this battery (in hours). Please also estimate the final SOC. The Peukert constant is assumed to be 1.2
ITEM# 82942 AGM 12VoLT SEALED LEAD ACID BATTERY For item #24928 12V 22Ah/20HR Completely sealed battery- will not leak Maintenance-free-never needs filing . Lasts up to 4 times longer than conventional betteries Holds charge longer and has slower discharge than conventional batteries * Can be stored longer than liquid acid batteries .Absorbs vibration better than liquid acid batteries SPECIFICATIONS Made in China CAUTIONExplanation / Answer
1) Peukert’s equation, n = log(I(C/T)) ;
The actual time to discharge this battery (in hours) = C / In
where C is theoritical capacity of battery 22 Ah
actual discharge current is 2 A
Peukert constant is assumed to be 1.2
Time of discharge = 9.576 Hours
Final SOC is zero.
2) given intial SOC is 100%, SOC after 300 seconds = ?
SOC after 100 sec, current drawn by load = 2A , SOC after 100 sec = 99.7474%
From now SOC after 200 sec at load = 5 A, SOC after 200 sec = 98.4848%
SOC after 300 sec = 98.4848%.
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