Solar Batteries May Allow Households To Reap Profits from Surplus Energy The feed-in tariff from excess power generated by solar panels is one of the great incentives for potential solar energy customers. While solar panel owners are rightly rewarded for the extra energy they send back to the grid, they have little to no control in determining the price of that energy, nor when they decide to share it. Imagine if you, as a solar owner, were able to pull all the strings – to store surplus solar energy in your own device and to sell it at a profit when demand is high. Your home would be a