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AQ-OP-00010_E
6.9 Energy Efficiency
Energy efficiency is determined by running a symmetric charge-discharge cycle, bounded by time or
voltage, and using the equation
𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 = 𝑑𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑒𝑛𝑒𝑟𝑔𝑦 𝑐ℎ𝑎𝑟𝑔𝑒 𝑒𝑛𝑒𝑟𝑔𝑦 ∗ 100%
⁄
Thus, for a given rate and temperature:
𝑚𝑎𝑥 𝑑𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑒𝑛𝑒𝑟𝑔𝑦 = 𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 ∗ 𝑐ℎ𝑎𝑟𝑔𝑒 𝑒𝑛𝑒𝑟𝑔𝑦
or
𝑒𝑛𝑒𝑟𝑔𝑦 𝑎𝑣𝑎𝑖𝑙𝑎𝑏𝑙𝑒 = 𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 ∗ 𝑒𝑛𝑒𝑟𝑔𝑦 𝑖𝑛
Energy Efficiency vs. Charge Rate
Ambient
Temperature
Current
24 A
48 A
72 A
96 A
118.8 A
10°C
89.70%
81.04%
73.30%
66.46%
61.00%
30°C
90.50%
82.48%
75.02%
67.78%
62.35%
40°C
90.06%
81.74%
74.06%
67.03%
61.15%
