AMS reader for Kamstrup smart power meter.

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Pow-K+, HAN port reader for Kamstrup meters

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No tax for United States [change]
You do not need 3D printed holder if you have a Kamstrup HAN module, or can print the holder yourself (STL file available). The Pow-K card can replace the original card in HAN-modules.
Stock available: 29
Volume discount
10+ items
Home automation
Power management

Delivered assembled, tested and programmed with latest versjon firmware AmsToMqttBridge.

Based on ESP32 wifi-module.

After first configuration which connects the unit to your local wifi, the web user interface can be opened on your internal network from a connected PC, tablet or phone. There is no cloud service, no data is sent outside your home network.

Connects to your smarthome system via MQTT. Setup for direct integration with Home Assistant is included in the firmware, see

Day-ahead system prices for your area in European country can be fetched from Prices are displayed graphically on the main screen, and delivered to MQTT broker. You need to register (free of charge) with Entso-E to obtain API key.

Video showing how to install and configure the Pow-K:

If you have a Kamstrup HAN-module, you can open it and replace the card with a Pow-K+, see instructions here. Or you can 3D-print a holder; STL file is available for download under the "Vedlegg" tab on this page.

Important notice to Danish customers 10th Sep -22: We get reports that the grid company Dinel ( have power meters that are not set up to send PUSH data. Please consult the latest updates in this Github thread before placing order.

Links to code and documentation

Documentation (

Code (

Product HS Code: 85437000

Shipping policy

31st July 23: We currently ship at least one time per week.

The seller

Frei, Norway
1001 orders since Apr 2, 2022
Solutions for reading smart power meters. Confirmed working on power meters in Norway, Sweden, Denmark - and some in Switzerland. Contact us before order to check status for other countries.
Norwegian customers are invited to order from
17th Nov 23: We have for a period offered registered shipping with FedEx, but have now seen it necessary to discontinue that. FedEx decided to deactivate our account around two weeks ago, due to a disputed invoice (they increased the shipment cost around 600% between time of order and invoice issue). A Fedex Customer Care Supervisor has claimed since the start of this week that the issue should be fixed "any day now", but we do not see anything happening.