Photovoltaic for main house

[yann65]

Hello

I have been reading for some time forum very nice
because there is a lot of info

but for those who are photovoltaic I do not know anything

my friend and I are going to visit before buying a barn, refit in the main house it is supplied with electricity by photovoltaic panels

so before visiting it I would like some information to know if the installation is good or not

what power do you need? (for main house with comfort excluding heating)
what amperage for the battery?

here is if you could give me more info so that I can watch
or any questions I can ask during the visit?

Thank you for your answers