The unit mostly works correctly, It is this, for example, that turns the inverterer off when we don’t need it, and back on when the fridge is too warm. What stopped working was the display – oddly the screen still works, it allows me to talk to the underlying system, but not to access the customised controls. We can also access the panel using our phones, and this functionality was still working. Clare found it a pain that she had to get her phone out to turn the power on when she wanted to boil the kettle, but it wasn’t a disaster.