Solar panels in Del Rio, TX

Roofs in Del Rio get about 1,805 hours of usable sunlight a year — more than 83% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.

Check your specific roof in Del Rio → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical Del Rio solar system costs

A 18-panel system (7.2 kW) is about right for an average Del Rio home using 10,800 kWh a year. It would produce roughly 11,047 kWh annually and offset 100% of that usage.

How we worked this out for Del Rio

Every number on this page comes from these seven steps. Nothing is a national average — the sunlight figure is measured from Del Rio rooftops.

Step 6 matters more than it looks. Only 34% of what a system this size produces in Del Rio is used the moment it is generated; the other 7,267 kWh is exported and credited one-for-one under net metering. Because exports here are credited at or near retail, that split changes the payback very little — 8.6 years against the 8.8 we show. In places where exports pay a fraction of retail the same split moves payback by years, which is why we model it explicitly rather than assuming.

Assumptions: 400W panels, 15% system losses (inverter, wiring, heat, soiling), $2.85/W installed, 10,800 kWh typical annual household use, 15.1¢/kWh electricity. Change any of those and every figure above moves — which is exactly why a single national "solar costs X" number is misleading.

Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.

Why Del Rio gets 1,805 sun hours

That figure comes from Google's analysis of real rooftops across Del Rio — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Del Rio reaches about 1,892 hours, roughly 5% better than typical.

The numbers behind this page

When Del Rio actually produces

Annual totals hide the thing that catches people out: 32% of Del Rio's yearly sunlight arrives in May–July, and just 17% across November–January.

Output is unusually steady — only about 2.0× between Jun and Dec. Del Rio is close enough to the equator that seasonal variation is mild, which makes sizing a system considerably more predictable.

The annual total is measured from Google's rooftop imagery. Its split across months is calculated from solar geometry at Del Rio's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.

How Del Rio compares to the other 788 cities

What actually stands out about Del Rio:

• Older imagery. Google's aerial capture of Del Rio dates from 2017. Tree growth and new construction since then are not reflected.

Cities with almost the same sunlight

These are the closest matches to Del Rio's 1,805 usable sun hours from other states and provinces. Same sunlight, different electricity prices — which is usually what decides whether solar is worth it.

Nearby cities

See all of Texas → statewide sunlight, rates, incentives and every city we've measured.

Del Rio solar questions

Worth reading before you buy

Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average Texas electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.