I recently faced the same challenge when installing a solar system over 4kW. At first, I was unsure about accessing the necessary M2M GSM cards and meeting the E-Redes requirements. I worked with Voltaicos, and they handled all the technical aspects for me. They not only installed the required totalizing meter and GSM modem but also managed the procurement of the M2M SIM card that complies with the OTA and STK specifications.
I recommend reaching out to them, as they have experience navigating these specific requirements for private clients. It was a hassle-free process for me, and they ensured everything was fully compliant with the new regulations. Let me know if you have any specific questions—I’d be happy to share more about my experience!