I paid $26,040 cash for my solar system. No loan, no lease, no PPA. When I tell people that, the reaction is usually either “wow, good for you” or “that seems like a lot of cash to tie up.” Both reactions are fair. Let me explain the math that led me to that decision, because the right financing choice depends on numbers that are different for everyone.
The Four Ways to Pay for Solar
When I was shopping, my options were:
- Cash purchase: Pay the full cost upfront, own the system outright from day one
- Solar loan: Finance the purchase through a lender (often arranged by the installer), own the system after payoff
- Solar lease: Pay a monthly fee to use the installer’s system — they own it
- Power Purchase Agreement (PPA): Buy electricity generated by the installer’s system at a contracted rate — they own it
Each has different implications for the ITC, your ROI timeline, and what you can do with the system later. I’ll be direct about the last two: leases and PPAs are usually the worst financial deal for the homeowner, and I wouldn’t consider them. If you’re not in a financial position to own the system (cash or loan), solar may not make economic sense for you yet. I’ll explain why.
Why Leases and PPAs Are Problematic
With a lease or PPA, you don’t own the system. That means:
You don’t get the 30% federal ITC — the company that owns the system gets it, and they may (or may not) pass some of that savings to you in the form of lower rates.
You can’t take the system with you if you move — the lease transfers with the home, which complicates the sale. I talked to two realtors during my research phase, and both said solar leases can be a significant drag on home sale negotiations. Buyers who have to assume a 20-year lease payment on equipment they didn’t choose are not always enthusiastic.
Your contracted rate may increase annually (many leases have 2-3% escalators built in). You’re locking in a long-term electricity price — which might be fine if utility rates spike, but you’re betting on that.
If the installer goes out of business — which happens — servicing a leased system becomes complicated. Who do you call?
I’m not saying no one should ever do a lease. If you truly have no other way to access solar and you’ve read the fine print carefully, it can still reduce your electricity costs. But own if you can.
Cash vs. Solar Loan: The Real Comparison
This is where the interesting math is. A solar loan lets you own the system (you get the ITC, you can resell freely) while spreading the cost over time. For a lot of homeowners, this is the right choice. Whether it was right for me required running actual numbers.
Typical solar loan terms I was quoted: 10-25 year terms at 4.99%-8.99% APR. The wide range reflects credit score differences and loan type (some are unsecured personal loans; some are home improvement loans using home equity; some are specialized solar loans).
Let’s model a $26,040 system with the 30% ITC ($7,812 credit):
- Effective cost after ITC: $18,228
- My estimated annual electricity savings: ~$1,750/year (based on 14 months of actual ownership data)
- Cash payback period: $18,228 ÷ $1,750 = 10.4 years
Now with a solar loan at 6.99% APR over 15 years:
- Monthly payment on $26,040: approximately $234/month
- Many solar loans have an “initial period” where, if you apply the ITC refund as a lump-sum payment, the payment drops. In practice, if you apply the $7,812 ITC payout to the principal, the effective loan balance becomes $18,228, with monthly payments around $164/month
- Annual loan cost: ~$1,968 (if not applying ITC) or ~$1,968 vs. $1,750 in savings = you’re cash-flow negative
That’s the rub with solar loans at rates above 6%: the monthly payment often exceeds the monthly electricity savings, especially in years 1-5. You’re not cash-flow positive until later in the loan term. Some people are fine with that — they view it as building an asset. But it’s not the “instant savings” story some installers pitch.
Why Cash Was Right for Me Specifically
I had the cash available in a savings account earning about 4.8% APY. So the real question for me was: is solar a better use of $26,040 than leaving it in savings?
My solar savings: $1,750/year = 6.7% return on the net-of-ITC cost of $18,228, rising over time as utility rates increase. That’s not a guaranteed return, but it’s very likely given the direction of electricity prices. It also has no taxes on the return (it’s savings, not income).
My savings account: 4.8% APY, taxable as income (so effectively about 3.6% after federal taxes for me).
Solar wins on return. Additionally, the return on solar improves with inflation in electricity rates; the savings account rate fluctuates with Fed policy and is currently declining from its 2023 highs.
Final consideration: I hate debt. That’s not a financial argument, that’s a psychological one. But it’s real. The peace of knowing I own my power system outright, with no monthly obligation, has value to me that doesn’t show up in a spreadsheet.
When a Solar Loan Makes More Sense
If you don’t have $18-26K in liquid savings, cash obviously isn’t an option. But even if you do, a loan can make sense if:
- You can get a loan rate below 5% (rare, but possible with excellent credit and a home equity loan)
- You have other high-return uses for your capital (though think carefully about what “high return” means in risk-adjusted terms)
- You want to preserve liquidity for an emergency fund or near-term purchase
At 5% or below, the loan math is competitive with the cash calculation, especially if you apply the ITC refund to principal in year 1. At 7%+, you’re probably better off finding a lower-rate vehicle or waiting until you can pay cash.
The Verdict
Cash was right for my situation: I had the savings, I got a better effective return than my alternative, and I own an asset that adds value to my home and produces energy for 25+ years. But I don’t recommend this approach categorically — the right choice depends on your cash position, loan rates you can access, and alternative uses of capital.
What I do recommend: never lease. And if you’re taking a loan, calculate whether you’re actually cash-flow positive from day one (after the loan payment vs. electricity savings), and model the total interest cost over the loan term. Make the decision with full information, not the installer’s optimistic chart.