I was trying yesterday to justify batteries but I decided it wasn't easily do-able. My solar isn't huge, and really won't produce enough to be of much use later in the year. The spare already goes to hot water.
I know I average about 12kWh a day in winter and 5kWh in summer, and all the chunky stuff (car, dishwasher etc) only runs during the cheap period anyway, so if I assume I'm only feeding the batteries from the cheap rate it really doesn't seem worth the effort and expenditure.
And the maths made the payback period awfully long, even if electricity prices don't fall significantly at some point in the medium term (which I believe they are expected to).
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