Fotovol

How many panels fit on your roof

Enter your roof dimensions and see instantly how many panels you can fit. The occupancy toggle gives a range (75% conservative – 100% maximum) to cover chimneys, dormers and walking lanes.

Roof type
Panel size
Roof tilt

At 30° the real surface is ~15% larger than the footprint.

Occupancy
10×4.6m 10×4.6m NSWE
Rotate the roof so it points to your actual north.

Estimate

16 panels

7.20 kWp

Estimated cost: 21,600 – 43,200 RON

A grant of up to 20,000 RON is available via AFM Casa Verde Fotovoltaice if you qualify.

Request a quote for ~7.20 kWp →

See the recommended capacity based on your consumption

Enter your average kWh and get a kWp recommendation, price range, and Casa Verde estimate.

These numbers are indicative only. Only an installer visiting your home can tell you exactly how many panels will fit and how they'll be positioned on your roof.

How panel count is estimated on a roof

The estimator uses a simple geometric model: length × width × number of slopes (roof faces), divided by panel area. Standard panel size is ~1.7 m × 1.0 m, with a 2 cm minimum gap between frames. The occupancy percentage you choose (75% conservative – 100% maximum) covers natural variations: chimneys, dormers, Velux windows, antennas, and service walkways. The estimator does NOT automatically detect these obstacles — you decide via the occupancy slider how much usable space remains.

Estimate limits

The model ignores three important factors: shading (from trees, neighbors, your own chimney), roof structure (snow load reserve in mountain areas, rafter condition, roof material), and specific obstacles (dormers, large Velux, vents). For a steep roof (>45°), usable area shrinks because of mounting structure angles — in practice fewer panels fit than the estimator shows. The estimate is indicative; the final number comes only after an on-site assessment and a structural check.

From estimate to next steps

With the number in hand, you have three concrete steps: (1) compare it with a simple cad sketch — any installer can do a free sketch from a roof photo; (2) request quotes from 2–3 installers in your area, using the number as a starting point; (3) use the capacity calculator to see how many kWp that panel count produces and whether it covers your consumption. Also read what the optimal tilt is. When ready, request a personalized quote.

Frequently asked questions

How many panels fit on my roof?
Quick formula: (length × width × number of slopes) / 1.7 m², with a 25% reserve for obstacles (the 75% setting in the estimator). For example, a 10×6 m roof with two slopes at 75% occupancy → ~52 m² usable → ~30 panels. The estimator above gives the exact number for your dimensions.
What's the best orientation in Romania?
South (fixed) is ideal for maximum annual production. Southeast + southwest distributes production more evenly across the day and works well on a two-slope roof. East and west lose 15–20% vs. south but are still economically viable. North we avoid or include only for large surfaces — output drops by over 40%.
What's the optimal tilt?
For maximum annual production in Romania, 30–35° is the ideal range. Below 15° you lose significantly in winter; above 45° you lose in summer. Details and edge cases (flat roof, too steep) in the dedicated article on optimal tilt.
Can I install panels on a flat roof?
Yes, with tilt structures that bring panels to 30°. The estimator uses footprint (length × width), so it gives the same number as for a sloped roof, but be aware that tilt structures occupy space between rows (self-shading) — in practice you install ~30% fewer panels than the estimator shows for a flat roof.
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