OwlWhat Sunrun's Production Guarantee Covers
Sunrun is one of the largest residential solar installers in the United States. Their product lineup includes leases (BrightSave), purchased systems, and solar-plus-battery packages. Not every Sunrun contract includes the same production guarantee terms.
The common structure of a Sunrun production guarantee:
- Annual kWh commitment: Your contract specifies a guaranteed annual production amount, often with a declining schedule each year to account for panel degradation.
- Measurement period: Production is measured annually — often on the anniversary of your system's interconnection date (check your contract for the exact date).
- Tolerance band: Some guarantees pay out only if production falls below a threshold (e.g., the full guarantee applies below 95% of promised output; above that, no payment).
- Remedy: If the system falls short, the contract specifies a credit mechanism (on your account or as a check) for the value of the unproduced kWh at a rate stated in your agreement — which may differ from your current utility rate.
What the Guarantee Does Not Cover
Read this section carefully — exclusions are where guarantee claims often get denied:
- Force majeure and weather exclusions: If production fell short due to an "unusually" bad weather year, Sunrun may argue the shortfall was weather-related and outside their control. How "unusual" is defined varies by contract and is a common dispute point.
- Customer-caused shading: Trees, additions, or structures you added that shade the panels after installation may void or reduce the guarantee for the affected period.
- Equipment tampering or unauthorized modification: Any modifications to the system not authorized by Sunrun.
- Utility curtailment: In some markets, utilities can curtail solar export. Check your contract for how curtailment events are treated in the production calculation.
The SolarEdge / Sunrun Combination
Many Sunrun installations use SolarEdge inverters. This creates a specific friction point when production falls short: Sunrun may attribute underperformance to SolarEdge equipment issues, while SolarEdge may attribute it to how the system was installed. Neither party readily absorbs the liability.
If this situation sounds familiar, see our dedicated guide: When your installer and inverter vendor blame each other. The key principle: your production guarantee is with Sunrun, not SolarEdge. Equipment failures are Sunrun's obligation to resolve before blaming them on the guarantee calculation.
How to Independently Verify Your Sunrun Production
Sunrun has access to your monitoring data — they're a party to your contract and an interested party in any guarantee dispute. Independent verification means using the raw data from your inverter manufacturer (not Sunrun's customer portal) and applying a weather-adjusted expected production baseline from a neutral source.
- Get your production data directly from the inverter manufacturer. Log in to your Enphase Enlighten or SolarEdge monitoring portal with your own homeowner credentials. Export annual production totals as CSV.
- Locate your guarantee terms in your contract. Find the specific annual kWh commitment and the measurement period start date.
- Compute the gap. If your actual annual production (from step 1) is below the guaranteed amount (from step 2), you have a potential shortfall claim. Calculate the difference in kWh, then multiply by the credit rate in your contract.
- Build an independent record. Document the comparison with timestamps and source data references. OwlWatt provides this documentation for Enphase systems.
- Contact Sunrun's guarantee claims process. Each major installer has a specific process. Ask for it explicitly — don't start with general customer service if you can help it.
What If Sunrun Disputes Your Claim?
If Sunrun denies or disputes your guarantee claim, your documentation quality becomes critical. Common dispute grounds:
- Arguing the weather year was unusually bad (verify this against NREL or NOAA irradiance data for your location)
- Claiming a shading or access issue that voids the affected period
- Disputing the measurement period dates
An independent weather-adjusted analysis — showing that your location received near-normal irradiance in the year your system underperformed — is the strongest counter-evidence to a weather excuse. This is exactly what OwlWatt produces for Enphase systems.
Common Questions
Sunrun says my low production was due to weather. How do I check?
Request the specific weather data Sunrun is referencing. Then compare it to NREL's National Solar Radiation Database (NSRDB) or NOAA's Global Horizontal Irradiance data for your specific location and the measurement year. If the irradiance data shows a normal or above-normal year, the weather excuse does not hold. OwlWatt performs this weather-adjusted comparison automatically.
I have a Sunrun lease. Does the production guarantee work differently?
On a Sunrun BrightSave lease, Sunrun owns the system and is responsible for production performance. The lease structure often includes a credit mechanism if the system underperforms — the exact terms are in your lease agreement. Because you don't own the equipment, Sunrun is also responsible for equipment repairs and maintenance, unlike a purchased system where you bear those costs.
How do I contact Sunrun about a production guarantee claim?
Sunrun's customer service line is 1-855-478-6786. For guarantee-specific claims, specifically ask for the "production guarantee" or "energy production" claims department. Document all communications in writing — follow up phone calls with email summaries.
Build the Independent Record Before You Need It
OwlWatt monitors your Enphase system continuously, compares production against a weather-adjusted baseline, and produces documentation you can use in a guarantee claim — independent of Sunrun's own monitoring systems. Start before a dispute, not during one.
Start monitoring with OwlWatt · How to file a shortfall claim