Picking a Solar Route: Sunrun Lease vs. DIY Purchase
I’m a procurement manager at a mid-size residential development firm. Over the past 6 years, I’ve tracked about $180,000 in cumulative spending on energy systems—solar panels, inverters, batteries, the works. We’ve compared quotes from Sunrun, local installers, and even looked at doing it ourselves for a pilot project.
Honestly, when we first started, the decision seemed simple: lease from Sunrun and walk away, or buy everything and own it. But after analyzing the numbers across five installs, the picture got a lot murkier. Here’s a real-world TCO breakdown from my spreadsheets.
Dimension 1: Upfront Cost vs. Total Cost of Ownership (TCO)
This is the most obvious difference, but also the most misleading. A Sunrun solar lease or PPA typically has zero upfront cost. You pay a monthly fee, which is often lower than your utility bill. For our DIY route, we had to front the capital: about $15,000 for a 6kW system including panels, inverter, and installation hardware. That’s a big check to write.
But here’s what the lease pitch doesn’t emphasize: the TCO over 20 years. I calculated it for our 6kW system (basically a standard 3-bedroom house). With Sunrun’s rate escalator (about 2.9% per year), total payments over 20 years came to roughly $28,000. The DIY system—after the federal tax credit (30%) and state incentives—cost about $10,500 upfront. Over 20 years, we’d need one inverter replacement ($1,500) and maybe a few panel cleanings. Total DIY TCO: about $12,000.
Now, that’s a huge difference—$28,000 vs. $12,000. But our situation was specific: we had the capital and the team to manage maintenance. If you don’t have $10k+ sitting around, or you don’t want to deal with inverter repairs, the lease is a no-brainer for predictability. Your mileage may vary if your credit score affects lease rates or if you can’t claim the tax credit.
Dimension 2: Maintenance, Repairs, and Hidden Headaches
This is where the “lease and forget” model really shines. When a microinverter failed on one of our DIY systems in the third year, I had to: diagnose it (which took a day), order a replacement (which was in warranty, but took two weeks), and then climb on the roof to swap it out. That was frustrating.
What most people don’t realize is that Sunrun’s lease includes not just hardware replacement, but also monitoring and performance guarantees. If the system underperforms, they pay you. For the DIY route, you’re responsible for everything. Our tracking data showed that over 6 years, we averaged one minor issue per system every 18 months. The average DIY fix cost us $200 and 3 hours of labor. With Sunrun, that’s a free phone call.
The bottom line: If you’re handy and have time, DIY maintenance is a small cost (maybe $300/year). If you’re a busy homeowner, the peace of mind from Sunrun’s service is worth the premium.
Dimension 3: The Integration Play (Batteries & EVs)
This is the dimension that surprised me. I assumed DIY would win here because you can buy components cheaper. But Sunrun’s integration with Tesla Powerwall and EV chargers is actually pretty good—and that matters for efficiency.
I compared quotes. A Sunrun solar + Powerwall package (installed) ran about $25,000. We sourced components separately: panels ($8k), inverter ($1.5k), Powerwall ($11k), and labor ($2k), total $22,500. That’s a saving of only $2,500, but the Sunrun install is a guaranteed timeline with a single warranty. Our DIY install took 4 weeks total because of scheduling the electrician separately. Sunrun’s turnaround was 10 days (which, honestly, I didn’t expect).
The automated process eliminated the data entry errors we used to have when coordinating three subcontractors. So while DIY is marginally cheaper in components, the efficiency loss (and stress) made Sunrun the better option for us on integrated projects.
Dimension 4: The Warranty and Exit Strategy
Here’s something vendors won’t tell you: solar leases are assets that depreciate on your balance sheet. If you sell your house, you have to transfer the lease or buy it out. That’s a potential deal-breaker for some buyers. Our cost tracking system flagged this as a risk for our model homes.
With DIY, you own the system. It’s an asset that adds to home value (about 4% on average, per Zillow). You can sell easily. The Sunrun lease is a liability that requires buyer approval—or you pay off the remaining contract value. That can be $15k+.
Industry standard: The value of certainty vs. flexibility is hard to quantify. But I’d say if your homeownership horizon is less than 7 years, DIY ownership is a better financial bet. If you’re staying put, the lease is fine.
Which Route for Which Scenario?
- Choose Sunrun Lease if: You have limited upfront cash, want zero maintenance worries, and plan to live in the same house for 10+ years. The TCO is higher on paper, but the predictability is worth it.
- Choose DIY Purchase if: You have capital, are comfortable with basic electrical work, and want maximum long-term savings (and home equity). We do this for our premium builds where we control maintenance.
The most frustrating part of this comparison is that there’s no universal winner. Our procurement policy now requires quotes from 3 vendors (Sunrun, local, and a DIY kit) because each has different strengths. For our standard builds, Sunrun’s speed and warranty win. For our custom projects, we go DIY every time.
Basically, don’t let the “free installation” marketing fool you. Run the TCO numbers for your specific situation—and be honest about whether you’re a “warranty guy” or a “fix-it guy.”
