Guides

How-tos, primers and deep-dives on residential solar in Spain — sizing, equipment choice, paperwork.

Solar water heaters explained: how thermosiphon systems work (2026 guide)

How solar water heaters work — thermosiphon flow, evacuated tubes, and heat pipes — plus the system types, how they compare with gas and electricity, and payback for a Spanish home.

Jun 5, 2026

How to choose a solar battery: low-voltage vs high-voltage (2026 guide)

Low-voltage or high-voltage? The choice that quietly decides how much power your home can draw, where the battery can go, and how big it can grow. A plain-English guide, a 5-step way to choose, and how our APX, AURA, AXE and HOPE batteries compare.

May 31, 2026

Single-phase or three-phase? 6 ways to tell at home (2026 guide)

Six honest ways to figure out whether your home is single-phase or three-phase — from the most reliable (look at your main breaker) to the easiest (ask your distributor). Plus a free analyzer that reads it from your electricity bill in ten seconds.

May 27, 2026

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