Considering Solar
Costing out if it''s worth getting a 2nd 9.5 kWh battery £3000 + easy installation( one cable) BUT with a 3.68 kWh inverter can only harvest about 15kwh between the two batteries on GO at 9p/kWh, on ECO7 can do 19kwh at 16p/kWh, plus need 5kwh to run the house though some winter daytime solar can contribute to that.