I’m in the process of getting quotes on the installation of solar panels. I have decided to go with SunPower E20 327 panels and a Fronius inverter. I am still to decide if I will go for a 4 Kw system on the north facing roof or a larger 6Kw system by adding an extra 2Kw on the west facing roof.
I have 3 phase power to the house.
My first question is do I need to go with a 3 phase inverter or can I go with a single phase inverter? What are the pros and cons of each?
I assume if I go with the 4Kw system I use a 3Kw inverter and a 5Kw inverter with the 6Kw option.
If I was to decided to go with the 4Kw option with the idea of adding the extra 2Kw later can I use a 5Kw inverter with the initial 4Kw installation