They promised your panels would pay for themselves.
You sat across from the installer with a proposal in your lap. Page 12 had the number — kilowatt-hours per year, the production guarantee that turned a $30,000 decision into something that felt like sense. You signed because the math worked. You signed because there was a guarantee. You signed trusting that someone, somewhere, would check.
The bill arrives. Something feels off.
Picture it: two years after installation, your electricity bill is lower than before — but not as low as the proposal said it would be. You open the installer's app. Green bars. Upward arrows. The dashboard says your system is producing energy.
But that sentence contains a word the app is quietly omitting: enough.
The installer's app knows whether your panels are producing. It does not know whether they are producing the number of kilowatt-hours that appears on page 12 of your contract. It was never asked to check that. Its job is to show production data. Your contract's job is to promise a specific outcome. Those are two different documents, and only one of them has a guarantee in it.
Meanwhile, something else has been running quietly. One microinverter failed around month fourteen. The remaining panels adjusted. The charts stayed green. The shortfall accumulated — a few kilowatt-hours per week, then a few hundred per year — and the measurement window in your contract kept ticking forward.
Green bars aren't a guarantee. Your contract is — if someone's watching it.
Two lines. One gap. Your guarantee lives in the space between them.
This is what an undetected shortfall looks like. Not an alarm. Not red text. Just a slow, quiet divergence between what was promised and what arrived — visible only when someone draws both lines at once.
Illustration. The remaining panels keep producing, the charts stay green, and the gap accumulates — until the measurement window in your contract closes.
Someone should be drawing those two lines. Someone who works for you.
What OwlWatt actually does.
OwlWatt reads the contract, watches the roof, and builds the documentation — independently, continuously, and without any financial relationship to the party that issued the guarantee.
Reads the contract
Upload your installer's agreement. OwlWatt extracts the terms that matter: the kWh target, the measurement window, the degradation schedule, the remedy clause. Your personal baseline, in plain language.
Watches the roof
OwlWatt connects to your existing Enphase microinverters — no new hardware, no electrician. Panel-level production data, every 15 minutes, compared continuously against what was guaranteed.
Builds the documentation
If a shortfall develops, you get an alert and one detailed production report per year — with methodology you can hand to a licensed attorney. If everything's on track, you get to stop wondering.
OwlWatt provides production data and contract documentation, not legal advice. If a shortfall develops, your report gives you the production record and verbatim contract terms to review with a licensed attorney in your state.
I was that homeowner. I built the tool I needed.
I bought solar in 2024. The first month's production looked off. When I asked my installer about it, they said it was within the expected range. When I asked what range that was, they said it varied. When I asked for the model they used to set expectations, they said they didn't have one I could see.
I'm a network engineer. I've spent fifteen years measuring things — packet flows, error rates, latency budgets. The idea that a $30,000 piece of equipment on my roof was producing what it was supposed to, and the only way to know was to take the installer's word for it, sat badly with me.
So I pulled my own data from Enphase's API and built the model myself. The 2024 data showed about an 11% shortfall against PVWatts modeling for my latitude, tilt, and panel specifications. I drafted a letter citing the model, the data, and the contract clause. They acknowledged the shortfall and scheduled a panel-by-panel inspection within two weeks.
Then I realized every solar homeowner has the same problem. OwlWatt is the tool that documents it.
Run an example. Check our assumptions.
Suppose a 10 kW system runs 8% below its production guarantee — a failed microinverter nobody catches, masked by the panels that still work. Here is what that scenario looks like over a 25-year system life, next to the cost of watching for it. Assumptions are labeled; this is a hypothetical example, not a measured average.
$87.89/yr × 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, valued at retail rates of $0.18–$0.35/kWh over 25 years — energy you paid for and bought from the utility instead.
Assumptions, in the open: hypothetical scenario, not a measured average · production ≈ 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.
Everything you need to monitor your guarantee. Nothing you don't.
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
- Email + in-app notifications
For homeowners who want to understand what they signed.
Contract vocabulary as texture: measurement window, degradation schedule, kWh target — used accurately, these make the difference between a documented claim and a missed window.
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.
Solar bill verification
How to cross-check utility bills against actual production.
Shopping for solar? Have the contract checked before you sign.
Upload the installer's proposal. OwlWatt flags guarantee terms that differ from common industry language — so you know what to ask about before you commit. Free.
You did your homework before you signed. Now make sure the other side did theirs.
Independent monitoring. Panel-level data. Contract-aware analysis. The documentation you need before the measurement window in your contract closes.
Start your free 30-day trial No credit card · cancel anytime · access to end of paid period