When someone asks how much they save with solar energy in Murcia, the honest answer is: it depends on when you consume. Panels produce by day; savings are bigger when the home uses power during those hours. Here are reference figures on output, self-consumption and compensation so you get an idea before asking for a quote.
How much electricity a system produces in La Unión and Cartagena
With close to 3,000 hours of sun a year, each installed kWp produces on average between 1,500 and 1,700 kWh a year if the roof is well oriented and unshaded. A 5 kWp system, around 11 panels of 450 W, therefore generates about 8,000 kWh a year. Output peaks in summer, which is also when air conditioning uses most.
What share of the output you really use
Not all the energy panels produce is used at that moment. Without a battery, it is common to self-consume between 35% and 55% of the output, depending on household habits. With a battery, that figure can rise to 60%-80%. The rest goes to the grid and is credited on your bill, usually at a lower price than the energy you buy.
A yearly savings example for a home in La Unión
Suppose a home uses 5,000 kWh a year and has a 4 kWp system, producing about 6,400 kWh. If you self-consume 45%, about 2,900 kWh, and the energy term costs €0.15/kWh, you avoid buying energy worth about €435 a year. The surplus, about 3,500 kWh, is credited at a lower price, for example €0.07/kWh, adding around €245. In total, about €680 of savings a year. These are ballpark assumptions: real prices change every month and with each supplier.
Which habits increase savings
Moving consumption to the sunny hours boosts savings: run the washing machine and dishwasher at midday, pre-cool the home with the air conditioning, or charge the electric car in the morning. If most of your use is at night, a solar battery may pay off. You can also pair panels with an aerothermal heat pump.
How long the installation takes to pay back
With the figures above and an installation price of €5,500 to €6,500, payback would be around 8 to 10 years without grants; with grants or rebates, or with higher summer consumption, it can drop to 5 or 7 years. Panels keep their performance for over 25 years. For price ranges by type of home, see our guide to the solar panel price in Murcia.
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With your bill and photos of your roof we can advise you on savings and payback.
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