- 10 years: $265/mo
- 15 years: $197/mo
- 20 years: $164/mo
What are your current monthly electricity costs, and what time horizon gets you a good break-even?
Also consider what electricity costs are gonna do. The loan locks in a monthly cost, but electricity rates have lately been increasing around 3% per year. Say you currently have a $150 monthly electricity bill... in 10, 15, and 20 years that will be $202, $233, and $270/mo.
There's other ways to finance it (PPA's, leases, maybe incentives if we get serious about our energy again someday, etc.) that have their own advantages/disadvantages, but even this simple approach shows there's some wins depending on your exact consumption, time horizon, time-value of money, and what you expect your electric load to do (will you get an EV? will you adopt heat pumps? will you need to start using way more AC in the summers? etc)
YMMV. As with most things in life, there is no one-size-fits-all. Do what's right for you.
I installed 7.8kw of rooftop solar for $8k out of pocket, all of which is on a ten year interest free loan.
In 12 months it makes smack on $1000 worth of electricity. So my payback is 8 years ( less, actually. The price of electricity here is already pre approved to increase no less than 5% a year) After that I get $1000 of power per year for twenty or so years.
The term no brainer doesn’t seem enough.
But the variance is huge.