If your wind/solar energy pricing goes negative, you're not using enough storage. Build more batteries, suck up that excess energy, and maximize feeding back to the grid when on-demand prices are high.
Consumers are now having a PV problem because they have to pay for their panels (I was asked to pay 800 euro per year). So, there is the incentive for many consumers willing to purchase a battery.
An alternative solution is the position of the panels. It is useless to have panels facing south, and don't use the roof, use the facade to improve the off season performance.
Either way you have to buy the panels. What am I missing here?