- Joined Jun 15, 2018
I want to reduce the power being sent to a heater element in my hot water tank. It currently takes about 12 amps at 240 V AC (~3000 Watts). What I want is to drop that to about 1500 Watts, what is the best way to do this? At first I thought resistors but I don't want to dissipate all the energy as heat as that will defeat the purpose of the whole exercise, that being to use less energy. So then I thought about using a transformer. I currently switch on the heating element using a smart plug when I have at least 3000 Watts of solar going spare. Ideally if I only had 2000 Watts spare, I want to drop the heating element to just 2000 Watts so that it only uses the excess solar and not draw anything from the grid. Ideally I could change the single smart plug for 2 smart plugs, each being able to deliver 1500 Watts so that I could then switch one or both on depending if I had less than 3000 (but more than 1500) Watts or more than 3000 Watts. Does that make sense? Anyway could I do this with a couple of appropriately rated transformers?