The first question every villa owner asks is: how much will I really save? The answer rests on three things: how much the system produces, how much of that you use at the moment it is produced, and the price your electricity supplier credits for the surplus. Here is how it works for a typical home in the Vega Baja.
How much a system produces here
With about 2,900 hours of sun a year, each well-oriented kWp generates between 1,500 and 1,650 kWh annually. A 5 kWp system on a villa can therefore produce 7,500 to 8,250 kWh a year. Output is higher from spring to autumn and drops slightly in winter, but never stops.
How much you use directly and how much goes to the grid
Without a battery, a villa with a pool and air conditioning typically uses 40% to 60% of what the panels produce at the moment it is produced. The rest is surplus. Running the pool pump, dishwasher or water heater around midday raises that percentage.
How surplus energy is credited
Under surplus compensation, energy you send to the grid is deducted from the energy part of your bill at the price agreed with your supplier. It is not paid as income and cannot make the bill negative. The exact terms are in your contract.
An example of yearly savings
Imagine a villa using 6,000 kWh a year and paying 1,200 euros for electricity. A well-sized system that covers about 60% of that consumption, between direct use and compensation, could save roughly 700 to 800 euros a year. An investment of 6,500 to 7,500 euros would then pay back in around 8 to 10 years without grants, and sooner with rebates or higher consumption. It is an illustration: your case may differ.
What can improve the result
Adding a battery, a heat pump or charging an electric car in daylight increases your self-consumption. Regular cleaning also matters in dusty areas, so ask about maintenance and cleaning when you plan your system.
Want a figure for your own home?
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