I have a Marlec Solar iboost on my Solar system. This heats the hot water when Excess Solar is detected. I have recently had a Fox ESS EVO10 fitted and I would like to continue with the Solar iboost as before. What do I need to do if anything to ensure that the iboost only switches in when the battery is full and the excess is being sent back to the grid. I have read that I may have to adjust the Solar iboost threshold above the battery cut in threshold.