Current Cost’s EnviR monitor basic model will monitor the consumption on one 240 VAC circuit—typically, the two incoming service wires. Setup of the standard kit includes installing a set of CTs and the battery-operated transmitter, which wirelessly transmits to the display, if within 100 feet.
Current Cost offers accessories to monitor more circuits, view information online, and track usage of single appliances. For online viewing, you can opt for the Enerati Gateway kit, which requires a data subscription. Individual appliance monitors (IAMs) are plug-based sensors that monitor electricity usage of individual 120 VAC appliances, recording real‑time power and energy use at 8- to 10-second intervals. Each display can accommodate up to 10 transmitters. Monitoring packages are also available for renewable energy systems that can track consumption, RE-system generation, and net usage. The EnviR can be purchased directly through the website or through resellers.
Locus Energy initially designed the LGate products to serve sites with PV systems. Now, it offers low-cost revenue-grade metering with the LGate 101. The LGate 50 monitors a building’s electricity consumption in kWh, as well as power in kW. The LGate meters also come with a five-year monitoring contract (included in the purchase of the unit) that can be extended for another five years.
The LGate uses CTs installed in the electrical panel. The LGate itself is installed outside the panel, but nearby. It accepts up to two sets of CT inputs, which are generally used to measure total building energy consumption and PV production. The meter requires its own 120 VAC, 15 A breaker and corresponding wiring. The LGate 101 requires a 240 VAC, 15 A power supply. The LGate connects to the Locus Energy servers through your Internet connection brought directly to the meter. LEDs inside the meter box indicate its communication status.
The LGate meters do not come with a display. Data is viewed via the SolarOS platform through a browser. The information is downloadable. LGate products are available only through solar contractors.
The OWL devices are designed to monitor only one circuit, usually the incoming wires to the main electrical panel. The CTs require accessing the main electrical panel for installation. The CTs are connected to a sending device, placed just outside the panel, which wirelessly transmits data to the remote display, which can be located up to 90 feet away. The OWL devices show instantaneous power usage, energy consumption, and cost. Both the display and the sending unit are battery-operated. The products have a longer history in the UK and Europe, but these limited versions are now available in North America through the OWL partners and other online retailers. The OWL Intuition series (which may not yet be available in North America) allows users to view information via any Internet-connected computer or by using a smartphone via the OWL app. A PV version monitors on-site PV system generation along with utility consumption.