The blog of the engineering firm that stays
Analysis and answers on home solar across La Costera and nearby, written by the engineers who then install, file and monitor. No hot air.
17 August 2026 · Captia Energy Team
A solar installation's paperwork, step by step
From the technical report to the energy certificate: the complete paperwork of a self-consumption installation, step by step, and what to keep at each stage.
17 August 2026 · Captia Energy Team
How much contracted power do you need with solar panels
With solar panels on the roof, many homes still pay for an inherited contracted power level. How to review it, work out your peaks and request the change.
17 August 2026 · Captia Energy Team
Solar panels, home insurance and your house's value
Fitting solar panels affects your home insurance and your house's value: how to notify your insurer, what each warranty covers and which papers transfer.
17 August 2026 · Captia Energy Team
Solar self-consumption myths: fact and fiction
Payback, the old sun tax, winter output, roof damage and batteries: we take apart the solar self-consumption myths still heard around La Costera, one by one.
17 August 2026 · Captia Energy Team
Battery ready solar: what it really means
Hybrid inverter or grid inverter with a later add-on: what each route involves, what battery ready really means and what is worth preparing today.
17 August 2026 · Captia Energy Team
Your consumption curve: the data nobody taught you to read
Your smart meter already records consumption hour by hour. Learn to read your curve and size your solar system, orientation and battery with real data.
17 August 2026 · Captia Energy Team
Winter solar output: what a La Costera roof produces
Short days, valley fog and cold that helps the panel: what a solar roof in La Costera produces in winter and why systems are sized for the whole year.
17 August 2026 · Captia Energy Team
Solar panels for country houses: off-grid or on-grid
Off-grid or grid-connected, batteries, solar pumping and the paperwork on rural land: what to know before fitting panels on a country house in Valencia.
17 August 2026 · Captia Energy Team
Solar on the shared roof: collective self-consumption
How collective self-consumption works in a block of flats: fixed sharing coefficients, the community agreement, the administrator's role and common mistakes.
17 August 2026 · Captia Energy Team
Energy communities in La Costera: an honest guide
What an energy community really is, how it differs from collective self-consumption, and what it would take to start one in a village in La Costera, Valencia.
17 August 2026 · Captia Energy Team
Air conditioning and solar: the summer marriage
Why air conditioning is the load that best matches home solar in La Costera: hour-by-hour coincidence, sizing, and usage habits that multiply the saving.
17 August 2026 · Captia Energy Team
An EV charger in your building's shared garage
How to install a charging point at your space in a shared garage: what Spain's Horizontal Property Law says, the real procedure and the current tax deduction.
17 August 2026 · Captia Energy Team
They installed my solar and never legalised it: what to do
What an unlegalised installation means, what you are missing out on, and how it gets regularised step by step, even if the company that fitted it no longer exists.
17 August 2026 · Captia Energy Team
Solar panels: responsible declaration or works licence
How rooftop solar is processed in the Valencian Community: the responsible declaration from Decree-law 14/2020, its exceptions and the town hall's role.
17 August 2026 · Captia Energy Team
How to compare solar quotes without being fooled
A guide to comparing home-solar quotes: what must be in writing, the warning signs, and the questions that expose a weak salesperson.
17 August 2026 · Captia Energy Team
How to read your electricity bill without losing your mind
The blocks of a Spanish household electricity bill in plain words: energy, power, regulated charges and taxes, and which ones solar can actually act on.
17 August 2026 · Captia Energy Team
Income-tax deductions for solar panels in 2026
Spain's 40% state deduction and the Valencian regional one for home solar, explained: requirements, the certificates that sustain them and the mistakes that sink them.
17 August 2026 · Captia Energy Team
Solar panel maintenance: what actually gets checked
What serious home-solar maintenance includes: electrical checks, structure, cleaning with criteria, and the daily monitoring that changes everything.
17 August 2026 · Captia Energy Team
Microinverters, optimisers or string: how we choose
The three inverter architectures for home solar explained without marketing: when we pick each one on La Costera's roofs and why.
17 August 2026 · Captia Energy Team
My roof does not face south: what can be done
What happens when your roof faces east and west, or the south face is taken: real losses, designs that work, and when it genuinely does not pay.
17 August 2026 · Captia Energy Team
How much a roof really produces in La Costera
Real solar production in La Costera according to PVGIS: what a south-facing roof yields in Xàtiva, how much an east-west one loses, and what drives it.
17 August 2026 · Captia Energy Team
Solar panels in the old town: clay tiles, heritage and permits
What changes when installing solar on traditional clay-tile roofs or near listed buildings in La Costera's historic centres: technique and permits.
17 August 2026 · Captia Energy Team
What they really pay for your solar surplus
How Spain's simplified surplus compensation works, the limits it carries and what to look at when comparing electricity suppliers.
17 August 2026 · Captia Energy Team
A home battery: when it pays off and when it does not
An engineering look at whether to add a battery to your solar installation around Xàtiva: consumption profiles, surplus and backup.
17 August 2026 · Captia Energy Team
Solar tax rebates across La Costera and nearby, 2026
A comparison of IBI and ICIO tax rebates for residential solar across La Costera and neighbouring comarcas, with the source by-law for each figure.