Your contract promises a number. We check it. Every 15 minutes.
Installer apps confirm that energy is flowing. Your production guarantee specifies exactly how much — measured over a defined window, with a remedy if the number falls short. OwlWatt reads the contract, watches the data, and gives you the documentation to act on it. It works for you, not the installer.
No credit card · no hardware required · cancel in one clickIllustration. The remaining panels keep producing, the installer’s dashboard stays green, and the gap accumulates silently — until the measurement window in your contract closes.
Not just a number. Context.
The installer’s app shows production. OwlWatt shows whether that production meets the specific number in your contract — with weather normalization, degradation tracking, and a documented record you can act on.
The example to the right shows a system running below its guarantee. The claim status field tells you exactly where you stand and what record exists.
The data was always there. Someone just needed to compare it against the contract.
Dollar figures shown are computed from this hypothetical system’s contract terms and retail rate assumptions, not measured averages. OwlWatt provides documentation, not legal advice.
The math is public. Check it yourself.
OwlWatt’s weather normalization and degradation models are based on published, peer-reviewed libraries and government research — not proprietary black boxes. Every calculation uses the same inputs a solar engineer would use.
Weather normalization
Solar irradiance and cell temperature modeled for your exact location, tilt, and azimuth using pvlib — the open-source physics library used in NREL research.
Real weather data
Actual hourly temperature and cloud cover for your address from Open-Meteo — not a regional average. Expected production accounts for what your roof actually experienced.
Degradation tracking
Year-over-year efficiency loss modeled against NREL-cited panel degradation curves. Performance is compared to what the manufacturer rated the panels to deliver at this age.
Three steps. No new hardware required.
Connect your Enphase account
OwlWatt pulls panel-level production data straight from your existing microinverters — automatically, every 15 minutes. No new hardware to install.
Upload your contract
We extract the terms that matter: kWh targets, measurement windows, degradation schedules, and exclusions. These become your personal performance baseline.
We keep watch
Actual production compared against the guarantee, continuously. If a shortfall develops, you get an alert and a documented production record. If everything is on track, you get to stop wondering.
OwlWatt provides information and documentation, not legal advice. If a shortfall develops, your production report gives you the contract terms and production record to review with a licensed attorney.
Installer apps show production. They don’t compare it to your contract.
Production data and contract compliance are two different things. One of them protects your investment.
| Capability | Installer app | OwlWatt |
|---|---|---|
| Real-time production data | ✓ | ✓ |
| Panel-level monitoring | ✓ | ✓ |
| Contract guarantee comparison | — | ✓ |
| Weather-normalized analysis (pvlib) | — | ✓ |
| Degradation tracking vs. contract | — | ✓ |
| Claim window monitoring | — | ✓ |
| Independent from your installer | — | ✓ |
| Annual documentation report | — | ✓ |
Someone should be watching. Someone who works for you.
Run an example. Check our assumptions.
Suppose a 10 kW system runs 8% below its production guarantee — say, a failed microinverter masked by the panels still working. Here is what that scenario looks like next to the cost of watching for it.
$87.89/yr x 25 years, price held constant for illustration. One detailed production report per year, alerts the moment a gap opens.
8% under-production on a 10 kW system at $0.18–$0.35/kWh retail rates over 25 years — energy paid for and then purchased from the utility instead.
Assumptions, in the open: hypothetical scenario, not a measured average · production approximately 13,000 kWh/yr for a 10 kW system at 1,300 kWh/kW-yr · retail rate range reflects current residential prices across U.S. markets · whether any shortfall is recoverable depends on your contract’s remedy terms — that is a question for a licensed attorney, with OwlWatt’s documentation in hand.
One plan. No surprises.
Free trial
- Full panel-level monitoring
- Contract audit baseline
- Production vs. guarantee comparison
- No credit card required
OwlWatt Pro
- Everything in the trial
- Continuous shortfall alerts
- Annual report with methodology you can hand to an attorney
- Weather-normalized analysis (pvlib · Open-Meteo)
- Email + in-app notifications
Cancel in one click, in the app, anytime.
Understand what you signed.
Is your solar system underperforming?
The signs to look for — and what they mean for your guarantee.
Production guarantees, explained
What was promised, how measurement windows work, and why the clock matters.
What if your installer goes bankrupt?
Your guarantee may survive — but only the documentation proves it.
Panel-level monitoring explained
Why whole-system monitoring misses problems that panel-level data catches right away.
Start monitoring with data you can act on.
Independent. Panel-level. Contract-aware. The methodology is published. The math is open. Free for 30 days.
Start free trial — no card required