Sense Energy Monitor with Solar – Track Electricity Usage and Solar Production in Real Time Meets Rigorous ETL/Intertek Safety StandardsTracks your home’s solar production, power use, and device activity in real time.Sense AEP4-ASSY 12 Sensor Extension Cable, GreySense 12’ sensor extension cables provide additional length between either the included current sensors or Flex add-on sensors and the Sense monitor. Extension cables are required when components of 400A split service panels or solar systems in the house are located far apart from one another. You can add up to 80’ of extension cable without the loss of fidelity.