Home Solar Power Guide How much solar power generation I need for my home?

How much solar power generation I need for my home?

Hey live in Barcelona, I have bought a new home and I want to install Solar Energy Systems there. As I don’t have knowledge about it so I need to know that which company makes solar power systems for residential purpose. Please anyone suggest me a best one and do tell how many solar power generation I need for three room set? And can I order it online?