Interesting change, but I'm hesitant to see this as an improvement in terms of total cost. Correct me if I'm wrong here....
Nearly all solar loans these days(like mine with Mosaic) have an origination fee, or what Tesla is labeling as "down" on their pricing. This is not however a traditional down payment(subtracted from the principle price tag), it's actually an origination fee ON TOP of the cash price that "buys you down" to a certain APR on the loan. This allows them to originate and sell a 1% loan profitably, they pocket a bunch of cash up front.
So if an array is priced at $20k cash, you'd need to pay a $4k fee that gets rolled into your new 10yr $24k loan @ 0.99%
Is that correct? That was essentially the deal with my Mosaic loan and I really didn't appreciate them being opaque about the pricing cash vs loan. It's advantageous for the buyer since the federal tax credit is then applied to the fee as well, but it's still a little shady to infer it's a "down payment", because it's not.
That's likely why you can't refinance into this, they'd need to charge you another massive origination fee.
Let me know what you think, that's my guess.