La actuación, con una inversión de 34.465 euros, se ha llevado a cabo en la Escuela Infantil Romanillos, donde se han instalado 77 módulos fotovoltaicos conectados a dos inversores trifásicos de 20 y 12 kW.
Why it matters: Bidding below €1/Wp on municipal Spanish projects is a recipe for bankruptcy once you factor in safety protocols and administrative red tape.
Let’s talk about the elephant in the room: the price tag. At €34,465 for a 32 kWp system, we are looking at roughly €1,077 per kilowatt-peak. In an era where Tier 1 module prices have cratered to record lows, some might call this expensive. I call it a reality check for installers tired of the 'race to the bottom' in the Spanish C&I sector.
The Hardware Math
Doing the math on the 77 modules reveals something interesting. To hit 32 kWp with 77 panels, you're using roughly 415W modules. In today’s market, where 550W+ bifacials are the standard for maximizing roof density, using 415W units suggests either a very specific roof constraint or an installer clearing out reliable, smaller-format stock. The choice of a split inverter setup (20 kW + 12 kW) is a classic field move to handle multiple roof orientations or shading from HVAC units—common in municipal buildings like the Romanillos school.
The 'Public Sector' Tax
Why isn't this project €800/kWp? Because anyone who has worked with Spanish Ayuntamientos knows the hidden costs. Between the rigid safety requirements (HSE) for working on a school and the bureaucratic nightmare of the RD 244/2019 administrative legalization, your margins can evaporate before the first rail is bolted down. If you are bidding on municipal tenders in Madrid or Andalusia at sub-€900 levels, you aren't an installer; you're a philanthropist.
For a nursery school, the load profile is a dream. They operate exactly when the sun is up, meaning a near 100% self-consumption rate without the need for expensive BESS. This is the 'low-hanging fruit' of the energy transition, but as professionals, we should focus on the serviceability. Using two smaller inverters instead of one large 30kW unit provides redundancy. If the 12kW unit fails, the school still harvests 60% of its potential. That’s the kind of logic that wins long-term O&M contracts.