True for the Kia, not as true on Teslas. Once NACS and the IONNA charging network and Walmart Charging Network roll out, I expect to see a lot more competition on rates. EA and Chargpoint have non-Tesla drivers by the junk these days with rates because there's no real alternative. Once you put the purchasing power of Walmart and 6 of the major automotive manufacturers behind two competing networks, EA and Chargepoint will need to relent.
On a recent Tesla trip, I got as low as 24 c/KwH at a supercharger. At those rates, even public charging is cheaper than fuel.
As someone who worked in this industry, be very careful with this if you decide to go forward. The loans on the install are NOT transferable to new owners and often have early payoff charges. This can cause big headaches if you go to sell your property even 10 years down the road. Additionally, unless you're in an area with extreme utility rates like California, the solar cells don't add enough value to the home to cover the cost of the install, meaning you can potentially put yourself under water on the value of your home.
I love the IDEA of solar, I hate what the financing structure has done with it. They make all their money on your loan, and very little on the installation and electricity sold. They might not even talk to you if you offered to pay cash for it. Unfortunately, it is likely that Tesla is going to end up saving that industry, too, because they're the only ones who don't structure the financing that way. There's a 2-3 year wait for them and they're focusing on only certain states.