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hello, I would like to get some advice on controlling my solar PV System. I have an 8.4kw solar array feeding into a Tesla powerwall 2. I also have a solar iboost to heat water in a hot water tank. I want to be able to fit a device to control the hot water heating using the powerwall when there is still above a given percentage of battery left and this needs to be smart phone driven so that I can change the heating times easily. I work random shifts so I need to vary the heating program weekly so I have hot water when I need it. If the battery is not charged enough then I want to go back to oil fired boiler heating. Is this possible?