Yes, a thread in its own is worthy.Thank you for giving the context. That would be a much better topic for a thread as about 10 questions immediately come to my mind.
If he ever adds battery storage and wants to use a solar diverter, he will want a dedicated circuit that the solar diverter can simply turn on and off, and he won't want the upstairs ring turning off when the batteries Yes a thread in its aren't fully changed.
In this case far more than 3kW can be generated which the surplus power over 3Kw (immersion heater size) will be used by the whole house and not exported back to the grid. In short, all the solar electricity will be fed into the whole house.
An iBoost can be fitted adjacent to a cylinder. The iBoost monitors export to the grid, and when export is about 25 watts, the iBoost sends solar power it to the 1st immersion output (to immersion), when the water temp reaches max temperature, it then switches to the 2nd immersion (the bottom one). Then when the both are at max temp, the iBoost allows for export to the grid. If the iBoost has no water to heat it can only allow export. This is fine when having a cheaper fuel like gas available. When solar available a relay can be on the output of the iBoost to switch out the gas boiler.
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