PV to hot water and heat storage controls schematic:
This system only uses the excess PV power (unless the Solic 200 button to use any power is pressed, and then it will allow any power for 90 minutes).
There are three output choices. Firstly to the hot water tank immersion until the tank reaches the temperature set point, then to one of the two storage heaters as chosen.
Although some people have mentioned that the Solic 200 (other types I cannot comment about) will limit the power through it, this design is limited to one output at a time which is a maximum of 3kW.
When the hot water tank has reached its target temperature the controls automatically offer the excess power to the MK 3 way switch( K8). This part of the system is designed for our home.
The choices are power to the hallway day storage heater or power to the timer which switches between the hallway and living room one.
Today we stored about 2.8kWh for overnight heating.
Any questions, let me know.