I am looking to install rooftop solar on my house some time this year. I have a decent amount of roof space and very little shading so I should achieve fairly ideal conditions for it.
A lot of the companies I've researched appear to offer full "systems" ranging anywhere from 4 to 30 panel installations (with various associated prices) but what I'm unsure about is how extensible a typical solar array is.
Let's say I choose to install 5 panels today. Could I 'extend' my system relatively cheaply with another 5 panels next year, only paying for the panels and some labour to attach them to the roof? Or would this require almost as much work (and cost as much) as a completely new install?