(2 customer reviews)

18,00 excl. vat

Case is sold separately
Comes with ESPHome pre-installed
Supported DSMR: 2/3/4/5
Powered via P1 port (parasitair, DSMR 5 only)
USB powered for older DSMR versions like 4, 3 or 2
RJ12 Cable included ~50cm

When esp-link is preferred, please let me know via reply on the order confirmation, or leave a note with the order.

Out of stock

Email when stock available

SKU: SL-PLUS Category:


SlimmeLezer integrates your energy meter with P1 port seamlessly into Home Assistant. Plug and play, no coding necessary. It comes pre-installed with ESPHome code. After joining it to your WiFi it will be recognized in Home Assistant and can be added easily.

The SlimmeLezer is designed to work with DSMR/ESMR 5. Working with DSMR 5 means that the Smart Meter can deliver enough power through the P1 port to power the reader. Therefore no extra power adapter is needed to work.

Older Smart Meters with DSMR version 4, 3 or 2 will work to, but will require extra power via the micro usb (not included).

Case for the SlimmeLezer

  • Case for SlimmeLezer+

    4,25 excl. vat


The SlimmeLezer comes without a case. The case can be ordered together with the SlimmeLezer.

ESPHome based

SlimmeLezer is powered by ESPHome. The code is now fully integrated within ESPHome.

Download the stl files for the case

Rather print the case yourself? No problem, download here the case:

Latest firmware

Without state_class fix:

Firmware for older meters (DSMR2.x)

Please look also at Michiel Appelman his GitHub. He has forked the firmware specific for DSMR 2 and 3 meters.

Precompiled esp-link

Common asked questions and information

Please look here for common asked questions, I will fill this more when more questions are asked:

2 reviews for SlimmeLezer+

  1. Harm Annema (verified owner)

    Hi Marcel,

    Just received my SlimmeLezer+ board, only can’t get it to function with my ZIV ESMR5 powered through the P1 port. I jused my multimeter to test the voltage from my meter with the supplied P1 cable from your kit and get a stable 5.24V. When testing with the SlimmeLezer+ attached to it and measuring the RJ12 socket contact’s on de back of the board I mesured arround 0.5V.

    Am I doing something wrong or do I have a defective board?


    • Marcel

      I see I missed your message, I’m very sorry for that. I’ve noticed that this type of meter, the ZIV, is quite picky… almost 50/50. Can you test it with an external usb power supply?

  2. Alexander Heindl

    I got a KAIFA MA309 today. As far as I understand it’s P1 port uses MBUS. Is SlimmeLezer+ compatible with it?
    Here a pdf provided by my electricity provider. it’s german, but I guess you can interprete the technical details:

    • Marcel

      No, mbus is not compatible, unfortunately. I am considering in making a mbus version though 🙂

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