We’ve had solar panels now for about 2 years. We did get a government “bonus” of 1650€ after 12 months. We have a 4.5kW installation and we sell back electricty that is not being used. Our electricty usage from EDF has decreased (I don’t have the figures to hand). We also, every 12 months get a payment from EDF for the electricty that we have put back into the grid. We do not have any batteries - we found them to be too expensive. We calculated with the installation company that our payback period was going to be about 7 years and I think we’re going to make that - it of course does depend on the weather. We also had our quotes checked by France Services - the Gard department has experts who can advise you - maybe the same in other departments.