One other thing to consider Sinead when you are thinking about using excess Solar is that you can only really use it on things like immersion heaters or other simple loads, lights etc.
Diverters work by turning the power on and off very rapidly so that small slices of the excess go to the device taking the power (unless you have a massive amount of excess that is).
Washing machines and dishwashers need to be powered all the time other wise they reset. So for instance if you put your washing machine on a socket powered by diverted power, you wouldn’t be able to set it up and start it unless there was enough diverted power and as soon as a cloud came along it would restart and need starting again with the start button. You can test this by turning the power on and off at the socket. Turn it off (as in no diversion 1st thing in the morning) and you won’t be able to do anything with it. Now turn it on (as in diversion during a sunny morning), once it’s running, turn it off and in all likelihood it will revert to it’s startup state where you need to press the start button to get it working running again.
So washing machines and dishwashers aren’t great for having connected to a diverter. What most people do is to make sure that they use these types of appliances serially, so they never have the washing machine or dishwasher on at the same time (or the iron, kettle, toaster or hairdryer etc.). This way any excess PV you have will be used by the appliance that is on at the time, as and when you use them. Takes a bit of thinking about to start with but once you’re in the swing of it you’ll do it automatically.
So your best bet for diversion is either one of Robin’s kits or a commercial solar diverter connected up to your immersion heater. That way and excess over and above your usage gets stored as warm water for use later. (Shower in the evenings of course). And if you work and can’t turn things like your dishwasher and washing machine on when it’s sunny then set them up on their built in timers to come on one after the other.