May I ask what kind of system you are using? I am also in Valencia and would like to deploy a balcony panel kit but as a solar noob I'm a bit overwhelmed by all the options.
The SolarFlow 800 Pro goes for around 500 euros, and good quality solar panels for ~120 each. ~100 for the power meter and ~70 for the brackets to install the panels on. Oh and maybe ~40 for cables.
You can also use the battery as a massive power bank with a 240V outlet on camping trips xD
[0] https://zendure.com/products/solarflow-800-pro [1] https://shellyspain.com/shelly-pro-em-50.html