Gerald Posted July 15 Share Posted July 15 I got myself a Shelly Pro 3EM to measure my total energy consumption of my house. - I installed the Shelly Pro 3EM according the documentation ... I add the clamps on the wires coming into my house right above the fuses. See Images L1_A_Clamp: L2_B_Clamp: L3_C_Clamp: The orientation is from outside the house towards the fuses as I understood the installation instructions. The interesting thing is that the active power of L1 (A) is swinging from positive to negative and at present I have no PV-system in my house. - So only consumer are connected to the electrical network. - On L1-phase only a dishwasher is connect as "big consumer". L2 (B) active power is also mainly negative and only the washing machine is attached to this line as "big consumer".+ Finally L3 (C) is positive all the time... So the total active power looks like this: the power factors of all 3 phases are positive between 0,08 and 0,49 Ob Obviously I miss something here... not sure why active power becomes negative while power factors are positive. - If someone can give me a hint where my error/mistake is hidden... I would be quite grateful. I guess no calibration is required... it should work out of the box... Thanks, Gerald Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted July 15 Members Share Posted July 15 Please double-check the correct allocation of current clamps to the voltage measurement points: Quote Link to comment Share on other sites More sharing options...
Gerald Posted July 15 Author Share Posted July 15 (edited) thanks for the response. - Each wire has about 230 V voltage between L1(A) and N; L2 and N; L3 and N and those wires are directly attached to the FI-switch. Edited July 15 by Gerald Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted July 15 Members Share Posted July 15 Sorry - you should not determine the voltage between live and neutral, but (according to the picture) the voltage between terminal A of the Shelly pro 3EM and the wire at which current clamp A is installed. This voltage has to be zero if the installation is correct. (Do the same for terminal B and clamp B, and for terminal C and clamp C.) Quote Link to comment Share on other sites More sharing options...
Gerald Posted July 15 Author Share Posted July 15 Ooops - yes thanks I just checked that one and this is okay and finally I found my mistake which is kind of embarrassing… On the FI switch are 4 contacts for L1 to L3 and N and my estimation was the wires are connected in that sequence from left to right. Therefore I interpreted the black wire as L1 and it was the normal guideline to use black for L1 and brown for L2 and grey for L3. This afternoon I discovered there were a change in the guidelines back in 2003 switching brown as L1 and black as L2. As I only bought the house and didn’t made any electrical installations I gave it a shot swapped the wires for the A and B clamp. Now for almost 2 hours I never got any negative active power values and my consumption raised to 1.3 kW.. unfortunately… 🙂 Thanks for helping me… highly appreciated… Issue seems to be solved… Gerald 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.