Hi. I've just installed 4 solar panels at my house, and this was done by the electric company itself (on my case EDP). Installments of 48€ over 48 months. Each panel 300W. 2304€ in total.
I could've done this directly with an installer (it would be "cheaper"), but i opted for the company for a few reasons.
First, warranty and support (10 years on the panels and microinverters + 2 on the instalation itself).
Second, i have a 10% discount on the invoice during 24 months.
Third, and because i have 4 panels (minimum is 3) i have a free station that measures all energy going in and out, and i can add IoT devices via ZigBee and create automations.
All excess energy goes to the network and i get money back (because it's only been one month and a half i don't have this number yet).
Besides this, i also installed a heat pump (300L) for heating water also connected to solar panels. In short my invoice dropped 50% in one month, from 200 -> 100€. Household with 2 adults and 2 children (all eletric no gas).
But this will improve due to more sun that now comes in, but also the value of the energy i supply to the network.
Batteries can make sense if you are more off-grid, besides that, i think it's better to go with the solution i have.
Hope this helps.