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I want to re-emphasize my ignorance of how the US tax credit works. Is 5 kWh the minimum size to get a federal tax credit? Is that total capacity, or only usable capacity?
If the minimum capacity for the minimum $2,500 credit is 5 kWh, that leaves $5,000 left at $417 per kWh, or 12 kWh. 5 kWh plus 12 kWh = 17 kWh for the maximum credit amount. What doesn't make sense is the first iteration of the Chevy Volt has a 16 kWh battery, yet it qualifies for the full federal tax credit amount.
Somewhere my understanding of the federal tax credit is wrong. Perhaps 4 kWh is the minimum size to get the tax credit. The plug-in Prius has a 4.4 kWh battery with 3 kWh usable, so where would it fit in?
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