The Marstek P1 Meter (CT003) is a smart energy monitoring device designed to give users real-time and detailed insight into their electricity consumption and production. It connects directly to the P1 port of a digital electricity meter (commonly used in the Netherlands and other European countries) or, in some cases, via infrared, allowing it to read live data without complex installation.

Once connected, the device transmits data via Wi-Fi or Bluetooth to a mobile app or energy management platform. This enables users to track their energy usage in real time, view historical consumption patterns, and better understand how and when electricity is being used in the home or business.

The Marstek P1 Meter is particularly useful in setups with solar panels, home batteries, or smart energy systems. By providing accurate, up-to-date data, it helps users optimize self-consumption, reduce energy costs, and make smarter decisions about energy usage. It can also support automation and integration with energy management systems, making it a valuable tool for improving overall energy efficiency.