Esteban Jifcote Posted August 31 Share Posted August 31 I have purchased three Pro 3EM to monitor the energy production on a 3 Phase Solar PV generator: one to measure the output from the inverter; one to measure power to/from the electric company; and one to measure power to the house. Because of the layout of the electric panel it would be more convenient to power all three modules from the same source - probably the power going to the house. Will this work or is the power supply to each module used to phase lock the power measurement? Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
AlexAn Posted August 31 Share Posted August 31 Die Spannung kannst du von einer 3poligen Sicherung verwenden. Die Stromwandler müssen natürlich in den jeweiligen Abzweig. Die Leistung am Hausanschluss wird korrekt sein aber die Energie kann leider nicht richtig berrechnet werden sobald eine Phase eine abweichende Energierichtung hat. Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Moderators terae Posted August 31 Moderators Share Posted August 31 You may connect all the devices to the same references to L1 (A), L2 (B) and L3 (C). The voltage reference is same for every single part of circuit, no matter where it is when it's connected together to same phases. Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Esteban Jifcote Posted August 31 Author Share Posted August 31 AlexAn, Terae, Thanks for the quick responses. Terae: regarding the voltage reference that was what I assumed. My doubt was about whether the module also used the phase information. But thinking about it a little more, the phase of both inputs and the output has to match also - that is part of the job of the inverter. AlexAn mentions feeding the modules from a 3 phase fuse. In an answer to this post thgoebel said The fuses are ONLY for the three phases supplying the Shelly! Suggested value is 250mA to 500mA If all 3 modules are powered from the same point is it ok to power all 3 from a single 3 phase fuse and if so what would be an appropriate rating. Or should each module be fused separately. I know these are newbie questions. I’m just looking for enough understanding to be able to explain what is needed to the electrician. Thanks for your patience. Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
tvbshelly Posted August 31 Share Posted August 31 However, if you have an RCD installed, make sure that you use the N after the RCD if you have also connected the Shelly to the 3 phases after the RCD Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
tvbshelly Posted August 31 Share Posted August 31 I would protect each Shelly individually with appropriate fuses. Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
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