DIY Solar Installation vs. Sunrun Lease: 25-Year Cost & Ownership Audit
Methodology: Calculated across 8.5 kW residential systems in California (NEM 3.0), Texas (ERCOT deregulated), and Florida (FPL retail net metering) using NREL SAM (System Advisor Model).
Direct equipment ownership yields 300% higher 25-year net equity ($45,000+ savings vs $14,000 under a PPA), making direct purchase or financed ownership vastly superior to third-party solar leases.
Side-by-Side Attribute Matrix
Direct Ownership DIY Solar Blueprint
- • 5.5 to 7.0 year full cash break-even horizon
- • No liens or PPA contract encumbrances on home deed
- • Unrestricted equipment selection (Tier-1 N-Type TOPCon panels)
- • Requires managing local utility interconnection permits
- • Owner responsible for rooftop installation or hiring licensed electrician
Sunrun Full-Service Solar PPA
- • Zero upfront capital required to install
- • Installer covers inverter replacements and roof leak repairs
- • Turnkey net-metering paperwork handled by company
- • Sunrun claims the 30% Federal ITC tax credit, not the homeowner
- • PPA escalator clauses can erode savings over 20+ years
- • Transferring PPA to home buyers can complicate real estate sales
Technical Analysis & Trade-off Breakdown
Financial Math: Cash Purchase vs. PPA Escalator Trajectory
Under a typical Sunrun Power Purchase Agreement with a 2.9% annual escalator, an initial $180/month payment compounds to over $360/month by Year 25, totaling $72,000 in payments. Direct equipment purchase for $18,000 minus the 30% Federal ITC costs $12,600 net and pays for itself within 7 years.
Real Estate Liquidity & Home Deed Liens
Homes with third-party solar leases frequently experience buyer friction because prospective purchasers must qualify for both the mortgage and the PPA assumption. Direct ownership adds appraised equity without UCC-1 fixture filing encumbrances.
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