Hi, I hope you don’t mind me taping into what appears to be a great resource of hand-ons experts. I discovered this site as I’m about to build a loft monitoring system using DHT22’s linked to a Raspberry Pi to monitor humidity (I have a condensation problem due to installing extra insulation) and to turn on extraction fans. Looking to use Node.js and possibly Node.Red. Anyway, my other challenge is concerning my smart meter and my solar PV system.
Some years back I installed a SolarLog 200 to monitor my PV system and it works fine. I then asked my electricity supplier to install a smart meter with an S0 output as the SolarLog has an S0 input so I can monitor consumption alongside generation and export. My electricity supplier offered me a limited range of smart meter and I choose the EDMI Mk7C as it has S0 output.
After many months of negotiation the engineer arrived and fitted the smart meter and took a cable from the S0 output terminals into a junction box. When he had left I connected the SolarLog to the junction box using 2 wires of a CAT5 or 6 cable of length 3.5m. Both units are configured for 1000 pulses per kWh. But the SolarLog is not registering any pulses on the web dashboard.
After further numerous emails with all 4 suppliers (smart meter, solarlog, supplier and distributor) eventually another engineer makes a visit and after spending over an hour on the phone declares that there is nothing wrong with the smart meter and it is configured for S0 consumption output. He then says that the smart meter does not produce a S0 electrical pulse but merely closes a relay. He says all smart meters do this for safety reasons.
In further discussions with SolarLog they say they are expecting a pulse of 30-40ms with a maximum voltage of 12v and a maximum load of 27mA. I suggested that I could provide a battery and resistor, or an optical coupler circuit, to provide some juice between the devices but they said no to this. http://alancooper.me.uk/Solar/S0_Possible_Interface_Circuit.jpg They sent a circuit diagram which I’ve uploaded to http://www.alancooper.me.uk/solar/solarlog_200_s0_circuit.jpg As per the diagram I’ve connected the CAT5 cable as here alancooper.me.uk/Solar/S0_Connector.JPG
Has anyone managed to link a smartmeter S0 output via cable to a SolarLog or similar? Suggestions welcome as I seem to have met a brick wall with all parties. Why did I think this would be plug and play!
Sorry for such a long post. Hope I’ve posted in the correct section but a search on S0 showed other posts were in Hardware.