Connecting Your Smart Meter to Your Home Battery: How to Do It

The smart meter as the foundation of smart energy management

In the Netherlands, over 90% of households now have a smart meter. What many people don't realise is that this meter can do much more than just measure consumption. Via the P1 port, the smart meter transmits detailed consumption data every second — live power in and out, per phase, including feed-in. Anyone who connects this data to their home battery has the foundation for truly smart energy management.

In this article, we explain how the P1 connection works, what you need for it, which home batteries support it, and what the benefits are in practice.

What is the P1 port and what does it measure?

The P1 port is a standardised data output on Dutch smart meters. The following data is transmitted every second:

• Current grid consumption (W): how much power you are currently drawing from the grid, per phase
• Current feed-in (W): how much power you are currently sending to the grid
• Cumulative consumption and feed-in (kWh): for your energy management and administration
• Gas measurement: gas is also read via the P1 port (via the smart gas meter connected to it)

How do you connect the smart meter to your home battery?

There are two commonly used methods to integrate the smart meter with your home battery:

Direct P1 connection via gateway

Many modern home battery systems have a built-in P1 reader or an optional gateway that connects directly to the P1 port. The battery uses this data to dynamically optimise charging and discharging:

• Anker SOLIX X1: supports P1 connection via the SolarLink communication module
• Huawei LUNA 2000: direct P1 integration via the Smart Dongle in combination with FusionSolar
• SolarEdge Home Battery: P1 connection via the SolarEdge Energy Hub system

Connection via a home automation platform

If you have a Home Assistant, Homey, or similar platform, you can convert the P1 data into universal signals that can control virtually any battery. This offers maximum flexibility but requires technical knowledge:

• Home Assistant with DSMR Reader: popular combination for advanced users
• Homey with P1 app: user-friendly route for less technically inclined users
• Custom MQTT/API connection: for developers and technically minded hobbyists

What does P1 connection deliver in practice?

The added value of a connected smart meter lies in the automatic decisions the battery makes independently based on real-time data:

Without a P1 connection, a home battery operates on a fixed schedule: charge in the morning, discharge in the evening. With P1 data, this becomes dynamic: the battery only charges when there is surplus (solar power), discharges as soon as grid consumption threatens to rise, and always takes the current price into account with dynamic contracts. In practice, this leads to 5-15% higher self-consumption compared to a system without smart meter control.

Step-by-step plan: connecting your smart meter

Want to connect your smart meter to your home battery? Follow this step-by-step plan:

1. Check whether your smart meter has an accessible P1 port (RJ11 connector, orange flap). 2. Check whether your home battery system supports P1 connection (see manual or contact HES). 3. Install the supplied gateway or order the correct P1 cable. 4. Connect the gateway to the P1 port and link it to your home network (WiFi or ethernet). 5. Add the gateway in your home battery's app. 6. Activate the 'smart meter control' or 'grid balancing' mode. 7. Check via the consumption report after one week whether the optimisation is working.