If it's as cheap as you say, I think you'd save hundreds of dollars per year. I wouldn't have guessed it was that cheap, but maybe it is. If you do it, let us know, eh?
If I understand correctly, the $2320 can be deducted from your income, but the tax savings would be 2320 x your marginal tax rate. If your marginal federal tax rate is 24%, for example (I speculate, not knowing your filing status, retirement investments etc), tax savings might be about $557.
I don't know exactly how the 5 cents/kwh translates to miles driven, but supposing 2.9 cents/mile to make an example (5% of your earlier deduction rate), "fuel" cost from forgone solar income might be 2320 x 5% = 116. That would produce the following savings:
700
-116
-----
584 gas savings
557 tax savings
-----
1041 savings subtotal
But you still have car costs from the Leaf. At a guess:
180 cost of capital (4500 x 4%)
150 insurance (sounds low to me, but I take your word for it)
100 tires & repairs (just spitballing, maybe I'm guessing high)
50 registration (may not apply in your state, just using the number from my state)
____
480 costs subtotal
Presumed profit:
1041
-480
-----
$521/year
Maybe work the example with more exact numbers from your case?
Consider though that if your situation changes, you may spend the money and not get permanent benefits. Then perhaps you would lose money instead of gaining. I guess it depends on how long you will drive it as you currently plan, as well as whether the costs are as low as you plan. Good luck!!