Payback · Cluj County · Romania
Commercial solar payback in Dej: 6.2 years
A self-consuming 100 kWp array on a commercial roof in Dej typically pays back in about 6.2 years. That figure uses Dej's specific yield of 1,152 kWh per kWp per year and a commercial tariff near €0.18/kWh, with 70% of generation used on site.
At that yield the array produces about 115,200 kWh a year and saves roughly €14,515 annually against an installed cost near €90,000. Over 25 years the net saving is around €272,875, while avoiding about 40.3 tonnes of CO₂ each year.
Dej is in Cluj County, alongside Cluj-Napoca, Turda and Câmpia Turzii. Those towns share the same irradiance zone, so payback is similar — the difference is which warehouses and factories still have empty roof. SolarScout lists them with a pre-computed business case rather than a generic "solar is cheap" pitch.
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Scan this area free →How the Dej payback number is calculated
Start with 100 kWp × 1,152 kWh/kWp = 115,200 kWh of annual production on a representative warehouse or factory roof in Dej. Apply 70% self-consumption against €0.18 per kWh and you get about €14,515 a year. Divide the €900/kWp installed cost (€90,000 for 100 kWp) by that saving and payback lands at 6.2 years.
This is a worked example, not a quote. Real payback moves with self-consumption, shading, export tariff and installed cost. It is still the right first filter: if a roof in Dej cannot beat roughly 6.2 years on these inputs, it is probably not a priority lead.
Dej versus the rest of Romania
Relative to Romania as a whole, payback in Dej is a little slower than the Romania average of 6.0 years, because Cluj County sits on the cooler side of the national irradiance band. Romania’s growing industrial base and solid southern irradiance make commercial rooftops — especially in the southern plains — strong candidates for solar prospecting.
That is why outreach in Dej should open with the local number — 6.2 years and €14,515 a year on 100 kWp — not a national average that under- or over-sells the roof.
What actually changes payback on a Dej roof
Yield is already baked into the 1,152 kWh/kWp zone for Cluj County. The bigger swings are usable roof area, daytime load (factories and cold stores self-consume more than empty warehouses) and whether the site pays the full €0.18/kWh commercial rate.
SolarScout estimates roof footprint from satellite and map data and, where Google Solar coverage exists, modelled annual output — so you can rank Dej sites by savings instead of guessing from a map pin.
Frequently asked questions
What is the commercial solar payback in Dej?
About 6.2 years for a self-consuming 100 kWp rooftop in Dej. That uses 1,152 kWh/kWp of local yield and a tariff near €0.18/kWh, saving around €14,515 a year.
How much electricity does 100 kWp produce in Dej?
Around 115,200 kWh a year. Multiply the 1,152 kWh/kWp specific yield for Cluj County by 100 kWp; shading and orientation can move that figure, which is why SolarScout models each roof rather than stopping at the city average.
Is payback in Dej better than nearby towns?
Payback is in the same band as Cluj-Napoca, Turda and Câmpia Turzii because they share the Cluj County irradiance zone. The practical difference is the stock of large, unshaded commercial roofs — SolarScout lists those in Dej with a pre-computed saving so you can compare sites, not just towns.