The Solar iBoost diverts most of the excess generation that is being exported. Eg it tends to still allow 2-300watts to be exported. It shows you what it is using now, so far today, yesterday, all week, 28 days and a running total.
It works using a WIRELESS current sensor around the live wire into the house and the iBoost sits near the immersion heater, which is supplied with 1-3kwh.
We use one with a 4kwp solar system and dont use the boiler from late april to mid october.
The Solic... sytem does similar but is simpler... eg it is installed near the Consumer unit as the current sensor in hardwired. The system does not keep track of how much it has saved.
It does benefit from having a zero cut off point... eg it will not allow anything to be exported... not like the 2-300w of the iboost. Of course when the tank is hot it will export all the excess generation.
I am currently considering upgrading to the Solic to stop losing this lost generation.