Yeh you do, I was coming home and checking the usage daily and couldn't understand despite generating 20kw from the solar panels why my bill was £5 when it should have been barely 2. Looked back on the app and found my sons girlfriend who does shifts was, rather than opening the windows or going outside was firing up the air-con machine he had in his bedroom for hours. We know it was that as it was hitting 2kw and apart from the immersion etc there is little that draws that much for that time period. I caved in to the air-con machine as his bedroom is top floor and gets roasting in there but on the understanding it was used only when necessary. Clearly opening a window or going outside in the shade was too hard. That was soon knocked on the head