Firms are spread across Albacete, Barrax, Letur and Casas-Ibáñez, among other towns. Near Albacete itself, are Tubo Solar.net, Solar World Stain and Tornasol Fotovoltaica. For work that needs return visits, a firm within an hour’s drive is usually worth a slightly higher quote.
Armero Solar, Solesluz Soluciones Solares and Eledsol Soluciones Electricas Y Renovables lead on Google among firms with at least 20 reviews. The average rating across the list is 4.7 (firms with at least five reviews). Read the low-star reviews as well as the high ones: how a firm answers a complaint tells you a lot.
Ask each installer to size the system from your actual use, appliance by appliance, rather than from the roof area. For an off-grid house the battery and the inverter matter as much as the panels, so get the battery chemistry, capacity and warranty in writing.
Questions to ask before you sign
- How many off-grid (stand-alone) systems have you fitted?
- Can you size the system from my appliance list?
- What battery chemistry, usable capacity and warranty are you quoting?
- Which inverter brand, and do you service it yourselves?
- What does the price include: fitting, cabling, certificates?