If there is a single-phase power supply in your property and you want to heat two separate hot water cylinders, you can use more than one Solar iBoost+. To do this, install a Solar iBoost+ unit at each cylinder with the Sender & Clamp at the electricity meter and follow these instructions:
Make sure the clamps are at least 10cm (3") apart to avoid any interference.
Adjust the cut-in threshold of one of the Solar iBoost+ units to 50W or more above the other. This unit will operate as the secondary unit. The factory default cut-in threshold is 100W, and you can adjust it in 50W increments up to a maximum of 500W.