Discussion
If that bank may be discharged only to 50 per cent, its usable capacity is
Answer: C
Correct answer: 4.8 kWh
Half the nameplate capacity may be used:
\[ 9.6 \times 0.5 = 4.8 \ \mathrm{kWh} \]The other half is left in the battery deliberately, to obtain the cycle life that a shallow discharge gives. This is why a system specified to deliver a given usable energy must be bought at twice that nameplate, and why usable rather than rated capacity is the figure that matters commercially.
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