You can buy a wifi power controller to link your solar PV and hot water boiler. However the item as shipped does not provide a way to clamp the power cables, and the cover over the live terminals can be opened by “little fingers”.
This cover can be fitted when wiring the unit up, and then glued to the base to fix both of these issues.
You'll need some M20 cable grommets and silicone glue to fit. Consult an electrician if this is required in your jurisdiction.
The author marked this model as their own original creation.