Good point on including the car in the savings...
In can be a difficult calculation. The true cost/savings should be based on the differential, not just the cost of the Leaf, ie how much more you are paying per term based on what you would have paid for the old car and any replacement.
Your solar installation has some of these variables, like the 200amp panel upgrade; a cost but also comes with additional benefits and it's a further investment in the home.
One cost to consider is property taxes on increased home value - you are including a return of some of those taxes via solar based credits. You will also carry some additional insurance liability along with slightly higher premiums.
Your electrical upgrade may even get you an insurance discount, although it will be possibly negated by any premium increase to cover the increase in insured value.
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