For those systems which do not have variable control of the immersion heater, if the immersion heater is switched on at complete power by a smart immersion they would take in more electricity than the surplus from the PV panels. The other is to replace the immersion with a Solaplug immersion, a standard heater and solar coil in one unit.

It has actually been revealed through analysis that the factor for the explosions is the amount of liquid within the tanks and the immersion heater. Every immersion heater producer offers advised heat levels that the immersion heater produces. Electric tank immersion heaters can produce dreadful effects if not made use of properly.
https://www.ramacorporation.com