@Euro50 You asked about financial help with installation. The answer is that help is currently at the ‘beer and fags’ level, rather than champagne and cigars… for us, help was useful, but fairly limited, given the overall installation costs in our case were about 11,000€.
The help could include:-
Possibility of a reduction in TVA (installation and/or labour)
Nil interest loan
Subsidies of up to 1500€ in some cases, locally dependent (apparently partly funded by fines from non compliance -if our installers are to be believed!)
Your chosen installer will know exactly what is currently available when you seek a devis…