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Solar panels and batteries: quotes to compare

Batteries for solar panels

Adding a battery to a self-consumption installation you already have.

  • Free and no obligation for you
  • At most 3 professionals receive your request
  • Only the company you reply to sees your phone
  • All of Spain, in 7 languages

Estimates are only a rough guide. Real output and savings depend on the installation, shading, your consumption and your contract. Grants, tax deductions and rebates vary by region and municipality: check them on the official pages. OfertEnergía does not promise any savings.

Get free quotes

1 minute. Up to 3 professionals in your area.

It is on the quote or the documents of your installation. Leave it empty if you do not know.

It is shown on your electricity bill.

Optional. Helps us find professionals nearby.

Up to 5 photos. They help to quote without a visit.

When do you need it?

Where are you now?

We send you a link to confirm and read the replies. No password.

Free for you. No obligation. You can delete your data at any time.

How it works

  1. Tell us what you need
    A short form: the service, the area and a few specific questions. No sign-up.
  2. Confirm your email
    We send you a link. Only confirmed requests reach professionals.
  3. Up to 3 professionals write to you
    They write to you on OfertEnergía with questions or a quote. You choose whom to reply to; only that company sees your phone.

OfertEnergía does not provide the service: it connects clients with registered professionals. It is free for you.

We do not show average prices or company counts: each professional gives you their own quote.

Solar calculator

Before you ask for quotes

  • Compatibility. Ask each company whether the battery works with your current inverter or whether it must be replaced, and to put it in the quote.
  • It changes the installation. Adding a battery modifies the electrical installation: it is done by an authorised installation company (RD 842/2002, art. 22), which issues the certificate at the end (art. 18).
  • Your self-consumption type. Check whether your type (with or without surplus, RD 244/2019, art. 4) or your compensation contract changes.
  • Ask for the quote in writing. Before you sign, the company must give you clear and sufficient information about the main features and the price conditions of the contract (RDL 1/2007, art. 60). Compare quotes item by item.

Official sources (checked 5 Nov 2026). General information, not advice: OfertEnergía does not provide the service.

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Frequently asked questions

How much does it cost the client?

Nothing. Asking for quotes on OfertEnergía is free and without obligation. Professionals pay for the requests they take.

Who receives my request?

At most 3 registered professionals for that service in your province, and only after you confirm your email.

Will I get endless calls?

No. Professionals write to you on the platform. Only the company you reply to sees your phone and email.

Does OfertEnergía do the job?

No. OfertEnergía is an intermediary service: it does not provide the service and is not a party to the contract between you and the professional.

Can I delete my data?

Yes, from the link of your request or by writing to info@ofertobra.es.

How does the comparison work?

You describe your roof and your consumption. Up to 3 registered installers send you their quote with the same sections (price per kWp, panels, inverter, battery, warranties, legalisation), and you see them side by side. You decide whether to go ahead and with whom.

What is the "price per kWp"?

It is the total price of the quote divided by the peak power of the panels (kWp). It helps to compare offers of different sizes, but it does not tell the whole story: also look at which inverter, battery, warranties and legalisation each one includes.

Are there IBI or ICIO tax rebates?

Some town councils grant them and others do not; the conditions are in your municipality's tax ordinance. Check it on your town council's website. We only show official sources, with their date.