Probably only if you signed up years ago and got a very high FIT. IIRC some were c. 40p per unit.
I just heard a piece about this and an energy consultant said that he had looked at using solar panels to charge batteries during the day and using the electricity at night, and the batteries would be expected to die half a year before he had recovered his cost, let alone made any profit.
He said that a 1kWh battery is c. £1,000 and with electricity c. 14p/unit it is pretty obvious that this is a non-starter. £1,000 divided by 14p is 7,142 full charge & discharge cycles just to get the battery cost back, and 7,142 days is over 19.5 years.
Anyone who talks positively about grid scale storage of electricity with batteries does not understand the area or has not done the sums. The electricity network in South Australia is in a mess, some would say because of an obsession with renewables. After some recent problems they are now building the world's largest battery, based on Tesla technology.
The costs of this seem to be secret but estimates range from AUD33 million to AUD240 million (£19-142 million). This gets a battery that will hold 129MWh which sounds a lot but SA demand is 800-2,000 MW, so the battery would at best power the state for less than 10 minutes.
Of course it is not intended to do that but to take in excess power that renewables generate that is not currently needed and supply that when it is needed. But it gives some indication of the hurdle in front of relying on renewables for more than a small part of the supply.
