# IoTaWatt **URL:** https://community.openenergymonitor.org/c/hardware/iotawatt/48.md [Latest](https://community.openenergymonitor.org/latest.md) · [Categories](https://community.openenergymonitor.org/categories.md) · [Tags](https://community.openenergymonitor.org/tags.md) --- ## [About the IoTaWatt category](https://community.openenergymonitor.org/t/about-the-iotawatt-category/5201)
**Author:** [@glyn.hudson](https://community.openenergymonitor.org/u/glyn.hudson)\ **Replies:** 2\ **Last updated:** [14 January 2020 12:30 UTC](https://community.openenergymonitor.org/t/about-the-iotawatt-category/5201 "2020-01-14T12:30:28Z")
See IoTaWatt forum for support: --- ## [Iotawatt Fails to post to EmonCMS](https://community.openenergymonitor.org/t/iotawatt-fails-to-post-to-emoncms/12308)
**Author:** [@Ryan\_S](https://community.openenergymonitor.org/u/Ryan_S)\ **Replies:** 56\ **Last updated:** [20 February 2025 08:20 UTC](https://community.openenergymonitor.org/t/iotawatt-fails-to-post-to-emoncms/12308 "2025-02-20T08:20:16Z")
So around noon today IotaWatt and EmonCMS started to not play nice. Looking at the logs in IotaWatt I see the following. SD initialized. 10/28/19 23:24:58z Real Time Clock is running. Unix time 1572305098 10/28/19 23… --- ## [Calibration of the sensor HSTS016L range 100A](https://community.openenergymonitor.org/t/calibration-of-the-sensor-hsts016l-range-100a/27827)
**Author:** [@Imenn](https://community.openenergymonitor.org/u/Imenn)\ **Replies:** 6\ **Last updated:** [27 January 2025 12:35 UTC](https://community.openenergymonitor.org/t/calibration-of-the-sensor-hsts016l-range-100a/27827 "2025-01-27T12:35:05Z")
Hey community, I am using the HSTS016, range 100A, I am trying to calibrate it using an ESP32 in order to measure DC current, the problem is whatever I do to make it work it gives me values like literally non sense. Ano… --- ## [Contactor and outlet surge trigger the Iotawatt to reset](https://community.openenergymonitor.org/t/contactor-and-outlet-surge-trigger-the-iotawatt-to-reset/24773)
**Author:** [@Arash\_sh](https://community.openenergymonitor.org/u/Arash_sh)\ **Replies:** 4\ **Last updated:** [14 November 2023 15:39 UTC](https://community.openenergymonitor.org/t/contactor-and-outlet-surge-trigger-the-iotawatt-to-reset/24773 "2023-11-14T15:39:00Z")
Hello, I’ve constructed my own Iotawatt using the open-source data provided by the developer, and it has worked well in various scenarios. Recently, I attempted to use Iotawatt with an industrial welding machine equippe… --- ## [HWCT-004 Decent little CT](https://community.openenergymonitor.org/t/hwct-004-decent-little-ct/3069)
**Author:** [@overeasy](https://community.openenergymonitor.org/u/overeasy)\ **Replies:** 6\ **Last updated:** [12 September 2022 10:09 UTC](https://community.openenergymonitor.org/t/hwct-004-decent-little-ct/3069 "2022-09-12T10:09:07Z")
While waiting for new PCB I took some time to modify my CT calibration rig so I can hook up non-clamp type CTs. I had picked up a bag of HWCT-004’s on eBay awhile ago for about $2 each and didn’t expect much. I was ple… --- ## [Best clip on CT's for IoTaWatt on a UK Dist Panel](https://community.openenergymonitor.org/t/best-clip-on-cts-for-iotawatt-on-a-uk-dist-panel/21055)
**Author:** [@Cliver](https://community.openenergymonitor.org/u/Cliver)\ **Replies:** 5\ **Last updated:** [9 August 2022 15:53 UTC](https://community.openenergymonitor.org/t/best-clip-on-cts-for-iotawatt-on-a-uk-dist-panel/21055 "2022-08-09T15:53:30Z")
Hi All, I’m new to the power monitoring game. Just about to get a solar PV installation with battery storage and I’d like to get a better view on our usage, where that power is coming from (solar, battery or grid), and h… --- ## [How To Configure EMONCMS to work with IotaWatt](https://community.openenergymonitor.org/t/how-to-configure-emoncms-to-work-with-iotawatt/15037)
**Author:** [@lologuay](https://community.openenergymonitor.org/u/lologuay)\ **Replies:** 1\ **Last updated:** [11 August 2020 06:22 UTC](https://community.openenergymonitor.org/t/how-to-configure-emoncms-to-work-with-iotawatt/15037 "2020-08-11T06:22:17Z")
Hi All, I have used the search to no avail to look how to config correctly emonCMS with IotaWatt I have followed directions on Iotawatts website how to configure the sending of the data, but I don’t know if emonCMS is … --- ## [Optical utility meter led pulse sensor own LED does not flash](https://community.openenergymonitor.org/t/optical-utility-meter-led-pulse-sensor-own-led-does-not-flash/10432)
**Author:** [@lyoxa](https://community.openenergymonitor.org/u/lyoxa)\ **Replies:** 16\ **Last updated:** [19 March 2019 18:47 UTC](https://community.openenergymonitor.org/t/optical-utility-meter-led-pulse-sensor-own-led-does-not-flash/10432 "2019-03-19T18:47:20Z")
Hello. I connected optical uled pulse sensor to the Arduino, I read pulses from a flashing LED at the digital input. Everything is OK, the pulses are measured normally, but its own backup LED does not flash. Tell me, p… --- ## [Unsupervised appliance identification and/or Non intrusive appliance load monitoring and dissagregation](https://community.openenergymonitor.org/t/unsupervised-appliance-identification-and-or-non-intrusive-appliance-load-monitoring-and-dissagregation/5935)
**Author:** [@Marvin](https://community.openenergymonitor.org/u/Marvin)\ **Replies:** 2\ **Last updated:** [23 March 2019 19:04 UTC](https://community.openenergymonitor.org/t/unsupervised-appliance-identification-and-or-non-intrusive-appliance-load-monitoring-and-dissagregation/5935 "2019-03-23T19:04:26Z")
Hi, I’m new to your community, but I was looking at some of the commercially available energy monitors and wanted access to the raw data and realized I’d have to go for something open source to get any sort of access to… --- ## [Particle Photon with pzem004T](https://community.openenergymonitor.org/t/particle-photon-with-pzem004t/11227)
**Author:** [@Yapno](https://community.openenergymonitor.org/u/Yapno)\ **Replies:** 3\ **Last updated:** [19 April 2020 14:43 UTC](https://community.openenergymonitor.org/t/particle-photon-with-pzem004t/11227 "2020-04-19T14:43:01Z")
Hi.everyone… I want to develop smart meter with particle photon and pzem004T. But there is no pzem library for photon… Plz explain how to solve… Thx… --- ## [Iotawatt rebooting every 61 seconds](https://community.openenergymonitor.org/t/iotawatt-rebooting-every-61-seconds/12332)
**Author:** [@mikefraser1945](https://community.openenergymonitor.org/u/mikefraser1945)\ **Replies:** 1\ **Last updated:** [31 October 2019 12:59 UTC](https://community.openenergymonitor.org/t/iotawatt-rebooting-every-61-seconds/12332 "2019-10-31T12:59:20Z")
Morning Folks, I have two Iotawatts in operation. Both have worked flawlessly for some months until about two weeks ago. One is now rebooting every 60 seconds or so with the log entry below repeated with each. I see t… --- ## [Resetting my IotaWatt meter](https://community.openenergymonitor.org/t/resetting-my-iotawatt-meter/12260)
**Author:** [@Lui](https://community.openenergymonitor.org/u/Lui)\ **Replies:** 1\ **Last updated:** [24 October 2019 09:00 UTC](https://community.openenergymonitor.org/t/resetting-my-iotawatt-meter/12260 "2019-10-24T09:00:38Z")
My meter stopped working some time back. It reset back to default. However, it still connects to the WiFi network that I first connceted it to. I would like to reset it to its default settings using the following command … --- ## [IoTaWatt connecte to Wifi but can not see it or ping it](https://community.openenergymonitor.org/t/iotawatt-connecte-to-wifi-but-can-not-see-it-or-ping-it/7649)
**Author:** [@Cgamarra](https://community.openenergymonitor.org/u/Cgamarra)\ **Replies:** 4\ **Last updated:** [24 October 2019 08:59 UTC](https://community.openenergymonitor.org/t/iotawatt-connecte-to-wifi-but-can-not-see-it-or-ping-it/7649 "2019-10-24T08:59:24Z")
Good afternonn I received today my IoTaWatt and I followed the instructions to connect it to my office’s wifi network: I connected to the IoTaWattXXXX wifi network and introduced the name and password of my wifi office … --- ## [Iowatt can work without burden resistor?](https://community.openenergymonitor.org/t/iowatt-can-work-without-burden-resistor/10788)
**Author:** [@saadshak](https://community.openenergymonitor.org/u/saadshak)\ **Replies:** 2\ **Last updated:** [28 April 2019 14:43 UTC](https://community.openenergymonitor.org/t/iowatt-can-work-without-burden-resistor/10788 "2019-04-28T14:43:34Z")
Can Iotawatt can work without burden resistor? If it can then please let me know details how it can work with complete explanation and schematic diagram? --- ## [20A Clip on current sensor](https://community.openenergymonitor.org/t/20a-clip-on-current-sensor/10045)
**Author:** [@solman](https://community.openenergymonitor.org/u/solman)\ **Replies:** 1\ **Last updated:** [10 February 2019 23:27 UTC](https://community.openenergymonitor.org/t/20a-clip-on-current-sensor/10045 "2019-02-10T23:27:44Z")
When I go to add the 20A clip on senors when buying a IoTaWatt there’s no link, is this part avalible? --- ## [A more industrial/commercial angle](https://community.openenergymonitor.org/t/a-more-industrial-commercial-angle/5440)
**Author:** [@samba](https://community.openenergymonitor.org/u/samba)\ **Replies:** 17\ **Last updated:** [5 February 2019 19:41 UTC](https://community.openenergymonitor.org/t/a-more-industrial-commercial-angle/5440 "2019-02-05T19:41:27Z")
Hello folks, I work with an energy management company in New Zealand. I deal with many public institutions that are starved for funds yet very inefficient. The majority of the people I interface with would love to have … --- ## [IotaWatt 4.0](https://community.openenergymonitor.org/t/iotawatt-4-0/4427)
**Author:** [@overeasy](https://community.openenergymonitor.org/u/overeasy)\ **Replies:** 202\ **Last updated:** [12 January 2019 11:46 UTC](https://community.openenergymonitor.org/t/iotawatt-4-0/4427 "2019-01-12T11:46:19Z")
The latest IotaWatt, now with OpAmp bias circuit and TVS diode arrays protecting all the inputs. Ready for CE testing. Component count has been cut in half and stability seems to be improved. --- ## [IoTaWatt, can it report kwh to EMON CMS?](https://community.openenergymonitor.org/t/iotawatt-can-it-report-kwh-to-emon-cms/7788)
**Author:** [@IOTA\_installer](https://community.openenergymonitor.org/u/IOTA_installer)\ **Replies:** 7\ **Last updated:** [12 January 2019 11:50 UTC](https://community.openenergymonitor.org/t/iotawatt-can-it-report-kwh-to-emon-cms/7788 "2019-01-12T11:50:40Z")
Hello all, Happily running with my IoTaWatt, but noted that the CMS needs to accumulate power data from IoTaWatt on 10 second intervals and calculate energy. IoTaWatt is already doing this, but the inputs available from… --- ## [IoTaWatt and emonTx Accuracy](https://community.openenergymonitor.org/t/iotawatt-and-emontx-accuracy/9413)
**Author:** [@glyn.hudson](https://community.openenergymonitor.org/u/glyn.hudson)\ **Replies:** 7\ **Last updated:** [10 January 2019 01:38 UTC](https://community.openenergymonitor.org/t/iotawatt-and-emontx-accuracy/9413 "2019-01-10T01:38:50Z")
As resellers of the IotaWatt we would like to make clear our view of the accuracy of the IotaWatt. The majority of users will likely get very good results from IotaWatt and we believe it is a great product. Many of the… --- ## [IoTaWatt with SCT-013-030 - config info?](https://community.openenergymonitor.org/t/iotawatt-with-sct-013-030-config-info/5542)
**Author:** [@TheShadow](https://community.openenergymonitor.org/u/TheShadow)\ **Replies:** 15\ **Last updated:** [8 January 2019 14:20 UTC](https://community.openenergymonitor.org/t/iotawatt-with-sct-013-030-config-info/5542 "2019-01-08T14:20:21Z")
Hi. Did anyone use the SCT-013-030 before? Which values have you used to configure it? I’m thinking about buying the IoTaWatt, and have quite a few of these CTs, so I was pondering on using’em… Thanks in advance! --- ## [Two IoTaWatts](https://community.openenergymonitor.org/t/two-iotawatts/9674)
**Author:** [@epirie](https://community.openenergymonitor.org/u/epirie)\ **Replies:** 2\ **Last updated:** [8 January 2019 04:13 UTC](https://community.openenergymonitor.org/t/two-iotawatts/9674 "2019-01-08T04:13:01Z")
Hello all I have connected two IoTaWatt units to my power panel, I did this because there is no way to monitor the main feeds to my power panel (Buss Bars cover with protective plastic) also there is no room to run wire… --- ## [IoTaWatt: EmonService: get input list failing, code: -4](https://community.openenergymonitor.org/t/iotawatt-emonservice-get-input-list-failing-code-4/9460)
**Author:** [@theTallMan](https://community.openenergymonitor.org/u/theTallMan)\ **Replies:** 2\ **Last updated:** [12 December 2018 03:38 UTC](https://community.openenergymonitor.org/t/iotawatt-emonservice-get-input-list-failing-code-4/9460 "2018-12-12T03:38:14Z")
Hello All, New to this, my linux is rusty but I’m following along with the great instructions. I’ve “built” an emoncms on a new pi 3B. Etchered the SD image and have everything running well. (One note is my SD card i… --- ## [Derived voltage reference (three-phase) and utility meter accuracy comparison](https://community.openenergymonitor.org/t/derived-voltage-reference-three-phase-and-utility-meter-accuracy-comparison/9391)
**Author:** [@overeasy](https://community.openenergymonitor.org/u/overeasy)\ **Replies:** 8\ **Last updated:** [4 December 2018 02:57 UTC](https://community.openenergymonitor.org/t/derived-voltage-reference-three-phase-and-utility-meter-accuracy-comparison/9391 "2018-12-04T02:57:21Z")
I think this might be a case of throwing the baby out with the bath water. While there may be an academic argument to discredit the “Derived Reference” method of monitoring three-phase installations, I have seen no dat… --- ## [US monitoring two pole circuits without common](https://community.openenergymonitor.org/t/us-monitoring-two-pole-circuits-without-common/8521)
**Author:** [@mikefraser1945](https://community.openenergymonitor.org/u/mikefraser1945)\ **Replies:** 2\ **Last updated:** [13 September 2018 13:03 UTC](https://community.openenergymonitor.org/t/us-monitoring-two-pole-circuits-without-common/8521 "2018-09-13T13:03:27Z")
Morning folks. I’m just setting up my first IoTaWatt. Works great on single pole, 120V circuits. However, I have a bunch of 2 Pole 240V circuits in my shop that do not use a common leg. I.e., wire is 2 hots & safety gr… --- ## [Iotawatt 3 phase](https://community.openenergymonitor.org/t/iotawatt-3-phase/8203)
**Author:** [@teledatalance](https://community.openenergymonitor.org/u/teledatalance)\ **Replies:** 2\ **Last updated:** [11 August 2018 14:14 UTC](https://community.openenergymonitor.org/t/iotawatt-3-phase/8203 "2018-08-11T14:14:31Z")
Trying to use iotawatt 3 phase - but I dont see the option for derived 3 phase setup anywhere. Is it now just a question of amending the phase angle for the channels on the different phases to use the derived reference … --- ## [Building the IoTaWatt](https://community.openenergymonitor.org/t/building-the-iotawatt/8034)
**Author:** [@dotnetdan](https://community.openenergymonitor.org/u/dotnetdan)\ **Replies:** 2\ **Last updated:** [28 July 2018 07:40 UTC](https://community.openenergymonitor.org/t/building-the-iotawatt/8034 "2018-07-28T07:40:46Z")
Hi IoTaWatt community, I love seeing these projects and I have made quite a few little ESP8266 things now. I am keen to make up this board as it looks like fun. Can someone please check my digikey shopping list and te… --- ## [Output Graphs?](https://community.openenergymonitor.org/t/output-graphs/6083)
**Author:** [@mgent](https://community.openenergymonitor.org/u/mgent)\ **Replies:** 6\ **Last updated:** [9 July 2018 17:43 UTC](https://community.openenergymonitor.org/t/output-graphs/6083 "2018-07-09T17:43:32Z")
Needed to change units. Solved. First off, great device!! Question: With the local iotawatt graph application I am unable to see any output feeds anymore. I can see the output values fine in the status screen and th… --- ## [Is Wifi ESP8266 in IoTaWatt technically compliant in Japan?](https://community.openenergymonitor.org/t/is-wifi-esp8266-in-iotawatt-technically-compliant-in-japan/7687)
**Author:** [@bou](https://community.openenergymonitor.org/u/bou)\ **Replies:** 2\ **Last updated:** [19 June 2018 13:10 UTC](https://community.openenergymonitor.org/t/is-wifi-esp8266-in-iotawatt-technically-compliant-in-japan/7687 "2018-06-19T13:10:51Z")
All, I need your help. I wonder if wifi module ESP8266 has already been compliant in Japan? Cheers, --- ## [MQTT for IotaWatt](https://community.openenergymonitor.org/t/mqtt-for-iotawatt/5834)
**Author:** [@michaeljquinn](https://community.openenergymonitor.org/u/michaeljquinn)\ **Replies:** 6\ **Last updated:** [7 May 2018 20:52 UTC](https://community.openenergymonitor.org/t/mqtt-for-iotawatt/5834 "2018-05-07T20:52:23Z")
Have we thought about MQTT as the comm protocol for IotaWatt, ? Would open up the platform for a whole variety of different interfaces (not for admin, but data) other than EMonCMS. --- ## [IoTaWatt three phase configuration](https://community.openenergymonitor.org/t/iotawatt-three-phase-configuration/6106)
**Author:** [@gth](https://community.openenergymonitor.org/u/gth)\ **Replies:** 49\ **Last updated:** [30 April 2018 16:49 UTC](https://community.openenergymonitor.org/t/iotawatt-three-phase-configuration/6106 "2018-04-30T16:49:22Z")
Hello, I live in France and my house is electrical supply with 3 phases. I have got an electrical car (Renault ZOE) with a 22 Kw charger (three phases). I would like to monitor my electrical consumption in different l… [Next page](https://community.openenergymonitor.org/c/hardware/iotawatt/48.md?page=1)