Impressive but as you say not cheap. My dumb cheapo system at £3.3k is now delivering in April 92% from the batteries & PV. We only have 4.2kWh of battery & a 3.6 kWh array. I couldn't see how such a large battery would payback, you must have a huge system to use 1.8MWh in 3 months. We have generated 1.7MWh in 4 1/4 years.
We have two big consumers, one is an electric storage cooker that also heats the kitchen and the other is an EV, otherwise we’d be using less than 50% of that in winter.
It makes you think about everyone supposedly switching to ASHPs and EVs in the next 10 years, household batteries are going to become essential items for flattening out the curve produced by an otherwise huge increase in peak electricity demand that would be beyond our generation infrastructure.
