If you're financing or doing a lease, you will be cashflow positive day 1. Solar is always cheaper than the utility. If you're choosing to buy for cash and invest in your home, there is a formula to calculate the break even. When factoring the tax credit the break even can be as low as 4 to 5 years. You can learn more about it in our blog here:
https://yupsolar.com/blog/is-solar-a-good-investment/
https://yupsolar.com/blog/how-long-do-solar-panels-take-to-pay-for-themselves-1/