Hi JYLW,
During the day, if your Photovoltaic (PV) solar is generating electricity, the inverter is properly configured, and your energy retailer has been informed and reconfigured your smart meter, the hot water if it is running on electricity, should be drawing energy from the solar energy generated by your solar panels. If the hot water draws more power than your solar panel generates, it will draw from your energy retailer.
Regards,
Schander
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