I financed with a low interest home equity loan through my credit union. My monthly payment was basically my average monthly electric bill. Instead of paying for electricity I paid my loan off.. My Eversource bill has been $9 for just the service charge for the last 4 years.
If your in Massachusetts the incentives are obscene. They have one now for batteries/powerwalls. I think 1 powerwall retails for 7k. You can get 3 for less than that.
This system would cost like 3 to 4x the amount in Ohio. This is a Tesla quote for ny sister in Boston. The incentives in Mass are nuts. I think your payback period is 4-5 years and then its free electricity for the next 20.