@Edent you mentioned electric showers in that post, and it reminded me that one of my favourite home battery features that I hadn't considered in advance of getting them is the effective boost to maximum output of our solar system before having to resort to the grid. Both the battery and solar inverters max out around 3.5kW each, so in the middle of the day we have up to 7kW of "free" energy at our disposal, which was more than enough to power the Eco setting on our old shower in the summer.