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Bills Cut by 90% With 18 Solar Panels & 30kW Battery Installation in Torrevieja

We eliminated a client’s €250 monthly bill by installing 18 Longi BiFacial panels and a 30kW Growatt battery system on a flat-roof townhouse in Torrevieja.

15 June 2025

Background

The client was referred to Xcel Energía by a previous customer.

Following this, we arranged a free on-site consultation to assess the property and understand the client’s energy usage. During our visit, the client expressed a desire to reduce their €250 monthly electricity bill. Rising energy costs were a major concern, and they were looking for a solution that would significantly reduce their long-term outgoings. The client was also interested in integrating an EV charger as part of the installation to support an upcoming electric vehicle purchase.

As the property featured a flat roof, the client was also concerned about maintaining a discreet aesthetic. The system design and installation needed to ensure low visual impact from surrounding buildings and neighbours.

Equipment

  • 18x 615W solar panels
  • 1x 30kW solar battery
  • 1x solar inverter
  • 1x EV charger

Installation

Our initial survey projected a dramatic reduction in the client’s monthly energy bill – from €250 down to just €20. The client was eager to move forward with the installation, given the projected return on investment within three years.

We installed 18 Longi BiFacial 615W solar panels on the property’s flat roof, along with a 30kW Growatt solar battery for high-capacity storage. The battery was sized to store sufficient energy to cover both residential and holiday use throughout the year.

Due to the client’s request for a discreet installation, we used flat-mount racking designed for low-profile visibility and aesthetic harmony. The addition of a Livoltek EV charger also enabled the client to take the next step and purchase a new electric vehicle, powered entirely by their solar setup.

Results

The client is now enjoying over 90% savings on their electricity bills, averaging just €20 a month. With the solar system already delivering excellent returns, they are on track to recoup the full investment in under three years.

“We’re absolutely thrilled with the results. Our bills have dropped dramatically, and the EV charger gives us future flexibility. The whole experience with Xcel Energía was smooth, professional, and clearly focused on long-term value. Would definitely recommend them to anyone thinking of going solar!”