Device Overview
The eGauge Core EG4015 is a multi-circuit energy meter that combines a meter, data logger, and embedded web server in one device. It is a strong fit for installer-led homes, solar projects, submetering jobs, and small commercial sites.
Core Features
The EG4015 has 15 isolated sensor ports for current transformers, 3 AC voltage inputs, a DC voltage input, Ethernet networking, 2 USB ports, and onboard storage for long-term data. eGauge positions the Core as a meter that can measure AC or DC power and log values such as volts, amps, watts, watt-hours, VA, VAr, frequency, and THD.
Installation And Measurement
This is an indoor open-type device installed near the electrical panel or monitored distribution equipment. It relies on external CTs selected for the installation, so the correct current rating and CT type matter. The official EG4015 datasheet supports up to 6900 A maximum current and lists ANSI C12.20 0.5% compliant accuracy.
Connectivity And Local Data
eGauge is strong for local data access. The device includes an embedded web server and can be used on a local area network. Official material also lists Modbus, BACnet, CSV, XML, and JSON data paths. Internet or the eGauge proxy can help with remote access, but the meter is not dependent on a subscription cloud service for local monitoring.
Home Assistant And Solar Fit
Home Assistant's official eGauge integration supports eGauge energy monitors running firmware 4.2 or newer and uses local polling. The integration can expose power, energy, voltage, and current sensors, and the Home Assistant documentation includes guidance for grid import/export registers in solar installations.
Buyer Notes
The EG4015 is a professional meter rather than a low-cost DIY monitor. CTs and optional communications accessories may be selected separately. For comparisons, the important questions are how many circuits need monitoring, what CT sizes are required, whether local API access is important, and whether the project needs Modbus or BACnet integration.