# FAQ **URL:** https://community.openenergymonitor.org/c/getting-started/faqs/44.md [Latest](https://community.openenergymonitor.org/latest.md) · [Categories](https://community.openenergymonitor.org/categories.md) · [Tags](https://community.openenergymonitor.org/tags.md) --- ## [Inputs inactive upon first install](https://community.openenergymonitor.org/t/inputs-inactive-upon-first-install/28770)
**Author:** [@JeanD](https://community.openenergymonitor.org/u/JeanD)\ **Replies:** 7\ **Last updated:** [29 June 2025 09:59 UTC](https://community.openenergymonitor.org/t/inputs-inactive-upon-first-install/28770 "2025-06-29T09:59:08Z")
Hi, I recently bought the emonPi2. I followed all the steps in the doc, and in emoncms, the inputs are all “inactive”. I tried with CTs plugged in or not, it made no difference. I looked online and in the forum and f… --- ## [What Inverter Should I Buy for My 3.5kW Solar Setup with 12V Batteries?](https://community.openenergymonitor.org/t/what-inverter-should-i-buy-for-my-3-5kw-solar-setup-with-12v-batteries/28586)
**Author:** [@Along09](https://community.openenergymonitor.org/u/Along09)\ **Replies:** 4\ **Last updated:** [26 May 2025 15:53 UTC](https://community.openenergymonitor.org/t/what-inverter-should-i-buy-for-my-3-5kw-solar-setup-with-12v-batteries/28586 "2025-05-26T15:53:35Z")
I’m currently in the process of upgrading my solar system and need some advice on choosing an appropriate inverter. Here’s what I have: Solar panels: I’ve installed 7 panels, each rated at 500W, giving me a total of 3.5… --- ## [Best Approach for Monitoring Solar PV and Battery System with OpenEnergyMonitor?](https://community.openenergymonitor.org/t/best-approach-for-monitoring-solar-pv-and-battery-system-with-openenergymonitor/28056)
**Author:** [@Camila](https://community.openenergymonitor.org/u/Camila)\ **Replies:** 2\ **Last updated:** [24 February 2025 19:28 UTC](https://community.openenergymonitor.org/t/best-approach-for-monitoring-solar-pv-and-battery-system-with-openenergymonitor/28056 "2025-02-24T19:28:44Z")
Hi Everyone, I’m in the process of setting up a solar PV system with battery storage and want to integrate OpenEnergyMonitor for real-time monitoring and data analysis. I’ve read through some of the guides and forum dis… --- ## [Three phase smart meter can’t connect to Openreach Poles](https://community.openenergymonitor.org/t/three-phase-smart-meter-can-t-connect-to-openreach-poles/27192)
**Author:** [@Holts](https://community.openenergymonitor.org/u/Holts)\ **Replies:** 6\ **Last updated:** [20 November 2024 14:26 UTC](https://community.openenergymonitor.org/t/three-phase-smart-meter-can-t-connect-to-openreach-poles/27192 "2024-11-20T14:26:27Z")
After months of being bombarded with request to install smart meter I have had a three phase one installed by EON . The only problem is that it can not communicate with what I assume are the units on the Openreach poles… --- ## [Frequently Asked Questions](https://community.openenergymonitor.org/t/frequently-asked-questions/3005)
**Author:** [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\ **Replies:** 1\ **Last updated:** [3 February 2017 18:50 UTC](https://community.openenergymonitor.org/t/frequently-asked-questions/3005 "2017-02-03T18:50:08Z")
Answers to issues commonly encountered when setting up and/or using an OpenEnergyMonitor system. --- ## [I just don't get it... I am clearly missing something!](https://community.openenergymonitor.org/t/i-just-dont-get-it-i-am-clearly-missing-something/23369)
**Author:** [@QuarryHouse](https://community.openenergymonitor.org/u/QuarryHouse)\ **Replies:** 10\ **Last updated:** [12 April 2023 15:29 UTC](https://community.openenergymonitor.org/t/i-just-dont-get-it-i-am-clearly-missing-something/23369 "2023-04-12T15:29:54Z")
A long time ago I managed to get data into EMON-CMS. I am now trying to add in data from an EMON Pi and TH and have managed to get as far as seeing the data flow into EMONPI.Local and am getting it graphing. What I simp… --- ## [Annual Space Heating Demand](https://community.openenergymonitor.org/t/annual-space-heating-demand/23145)
**Author:** [@BrianW](https://community.openenergymonitor.org/u/BrianW)\ **Replies:** 1\ **Last updated:** [15 March 2023 12:45 UTC](https://community.openenergymonitor.org/t/annual-space-heating-demand/23145 "2023-03-15T12:45:56Z")
Hi I’ve using your Heatlossjs tool. ( excellent by the way, the ease with which I can go back & tweek things is really useful, & try different values) . One question , the Annual Space Heating Demand seems to be the sa… --- ## [How to use Arduino IDE V2 on Ubuntu - and update emonTH sketches](https://community.openenergymonitor.org/t/how-to-use-arduino-ide-v2-on-ubuntu-and-update-emonth-sketches/21564)
**Author:** [@JustPlaying](https://community.openenergymonitor.org/u/JustPlaying)\ **Replies:** 0\ **Last updated:** [12 October 2022 18:20 UTC](https://community.openenergymonitor.org/t/how-to-use-arduino-ide-v2-on-ubuntu-and-update-emonth-sketches/21564 "2022-10-12T18:20:55Z")
The new IDE for Arduino, V2, came out on 2021. So as a first time Arduino programmer - I installed it instead of V1. My laptop is Ubuntu 20. The old IDE: Arduino IDE 1 - has a help page here using Ubuntu: Learn | Ope… --- ## [Optical sensor (pulse for gas meter)](https://community.openenergymonitor.org/t/optical-sensor-pulse-for-gas-meter/20907)
**Author:** [@davidbeiler](https://community.openenergymonitor.org/u/davidbeiler)\ **Replies:** 5\ **Last updated:** [20 July 2022 10:38 UTC](https://community.openenergymonitor.org/t/optical-sensor-pulse-for-gas-meter/20907 "2022-07-20T10:38:45Z")
hi! Im very interesting in buying an Optical Utility Meter LED Pulse Sensor will it work with any gas meter that has a pulse? this is my gas meter (this is what it looks like) --- ## [HAL-GetTick() always returns 0](https://community.openenergymonitor.org/t/hal-gettick-always-returns-0/18813)
**Author:** [@Chedy\_Souffargi](https://community.openenergymonitor.org/u/Chedy_Souffargi)\ **Replies:** 0\ **Last updated:** [18 October 2021 08:11 UTC](https://community.openenergymonitor.org/t/hal-gettick-always-returns-0/18813 "2021-10-18T08:11:36Z")
Hello Guys, I’m a novice and I’m trying to write the emontx code with HAL Library on STM32. My problem is that HAL\_Gettick() always returns 0 but HAL\_DELAY works perfectly. How could this Problem be solved? I’ll be ver… --- ## [Remote CT to control GTI export limit 250 feet (~75 meters) away](https://community.openenergymonitor.org/t/remote-ct-to-control-gti-export-limit-250-feet-75-meters-away/16511)
**Author:** [@Darmilio](https://community.openenergymonitor.org/u/Darmilio)\ **Replies:** 28\ **Last updated:** [5 May 2021 23:31 UTC](https://community.openenergymonitor.org/t/remote-ct-to-control-gti-export-limit-250-feet-75-meters-away/16511 "2021-05-05T23:31:01Z")
Hello, I am in need of a remote CT transmitter and receiver (I think). My split phase 240 supply is approximately 250 feet from my solar shack. The solar shack contains everything related to solar input back to the mai… --- ## [Before the beginning](https://community.openenergymonitor.org/t/before-the-beginning/15947)
**Author:** [@Jimclarke](https://community.openenergymonitor.org/u/Jimclarke)\ **Replies:** 5\ **Last updated:** [10 November 2020 22:28 UTC](https://community.openenergymonitor.org/t/before-the-beginning/15947 "2020-11-10T22:28:12Z")
Looking to purchase EmonPi but I want to monitor 3 CT ccts. Home is a single phase UK supply. I have a 3kW Solar system installed (16 Panels) plus a Solar Boost. I am keen to monitor the power usage of the house and t… --- ## [emonTX to emonbase via wifi](https://community.openenergymonitor.org/t/emontx-to-emonbase-via-wifi/13603)
**Author:** [@Crestronian](https://community.openenergymonitor.org/u/Crestronian)\ **Replies:** 12\ **Last updated:** [12 October 2020 20:09 UTC](https://community.openenergymonitor.org/t/emontx-to-emonbase-via-wifi/13603 "2020-10-12T20:09:31Z")
Hi. I need to link several emonTX to an emonbase for local monitoring. They are in different buildings so well out of range of RF communication. Can I make this work with the Huzzah WIFI modules instead? If so then can … --- ## [EmonTX E1 value is 4294967231.00 kWh](https://community.openenergymonitor.org/t/emontx-e1-value-is-4294967231-00-kwh/14933)
**Author:** [@mancavePVun](https://community.openenergymonitor.org/u/mancavePVun)\ **Replies:** 14\ **Last updated:** [31 July 2020 18:30 UTC](https://community.openenergymonitor.org/t/emontx-e1-value-is-4294967231-00-kwh/14933 "2020-07-31T18:30:03Z")
Hi, have had Emoncms setup for about a week now. All working fine until we had a power cut this morning. I capture the incoming house supply using an EmonTX rather than a EmonPi because the solar inverters is at the ot… --- ## [MQTT Explorer](https://community.openenergymonitor.org/t/mqtt-explorer/14050)
**Author:** [@Pukka](https://community.openenergymonitor.org/u/Pukka)\ **Replies:** 1\ **Last updated:** [30 April 2020 15:31 UTC](https://community.openenergymonitor.org/t/mqtt-explorer/14050 "2020-04-30T15:31:00Z")
From MQTT - Guide | OpenEnergyMonitor When SSH in to the emonpi i am unable to run the command mosquitto\_sub -bash: mosquitto\_sub: command not found Also the last paragraph says To avoid connecting via SSH alternatel… --- ## [Emonlib.h not working with platformio esp32](https://community.openenergymonitor.org/t/emonlib-h-not-working-with-platformio-esp32/13864)
**Author:** [@albaboun](https://community.openenergymonitor.org/u/albaboun)\ **Replies:** 2\ **Last updated:** [15 April 2020 19:12 UTC](https://community.openenergymonitor.org/t/emonlib-h-not-working-with-platformio-esp32/13864 "2020-04-15T19:12:32Z")
hello, I am doing a project with a current transformer , esp32 dev kit , visual studio code and platformio. Library :emonlib.h After I download my project to esp32, I turn on the serial monitor, the serial monitor wor… --- ## [Multiple emonTx Shields?](https://community.openenergymonitor.org/t/multiple-emontx-shields/13414)
**Author:** [@Martynas\_Stanaitis](https://community.openenergymonitor.org/u/Martynas_Stanaitis)\ **Replies:** 39\ **Last updated:** [25 February 2020 20:46 UTC](https://community.openenergymonitor.org/t/multiple-emontx-shields/13414 "2020-02-25T20:46:17Z")
Hi, Can emonTx shields be stacked or connected to a single Uno/mega/stm32 board? If not - why? Is it a hardware limitation? is it a software issue? I would like to create a big managed power brick (8 sockets) for my aqu… --- ## [Emoncms.org credits](https://community.openenergymonitor.org/t/emoncms-org-credits/13190)
**Author:** [@crazynight](https://community.openenergymonitor.org/u/crazynight)\ **Replies:** 2\ **Last updated:** [4 February 2020 21:30 UTC](https://community.openenergymonitor.org/t/emoncms-org-credits/13190 "2020-02-04T21:30:22Z")
How do you go about claiming your Emoncms.org credits? --- ## [PV & Battery storage](https://community.openenergymonitor.org/t/pv-battery-storage/13068)
**Author:** [@crazynight](https://community.openenergymonitor.org/u/crazynight)\ **Replies:** 0\ **Last updated:** [20 January 2020 09:21 UTC](https://community.openenergymonitor.org/t/pv-battery-storage/13068 "2020-01-20T09:21:30Z")
How does EmonCMS handle battery storage. While I have something working using EmonSD and then pushing the usage/solar/pv/battery data from the various systems and CT clamps I already have around the house to EmonCMS via… --- ## [Where to buy iotaWatt in UK](https://community.openenergymonitor.org/t/where-to-buy-iotawatt-in-uk/12966)
**Author:** [@gadgetbazza](https://community.openenergymonitor.org/u/gadgetbazza)\ **Replies:** 1\ **Last updated:** [11 January 2020 18:02 UTC](https://community.openenergymonitor.org/t/where-to-buy-iotawatt-in-uk/12966 "2020-01-11T18:02:05Z")
Hiya, looking at getting an iota watt device so that I can get a better handle on my 3 phase readings as the voltage across phases is quite different. I’ve read the details on here but when I follow the link to the sto… --- ## [‘Smart! Meters](https://community.openenergymonitor.org/t/smart-meters/12194)
**Author:** [@Chas\_Hyde](https://community.openenergymonitor.org/u/Chas_Hyde)\ **Replies:** 7\ **Last updated:** [21 October 2019 22:19 UTC](https://community.openenergymonitor.org/t/smart-meters/12194 "2019-10-21T22:19:40Z")
Hi I’m a newbie on this forum, but I have had a ‘Robin Mk2’ diverter since 2013. Will my diverter function with a smart meter? I’m asking do that I know the situation for when/if I’m forced down the smart meter route. T… --- ## [Saying Hi from the US](https://community.openenergymonitor.org/t/saying-hi-from-the-us/12058)
**Author:** [@teagueAMX](https://community.openenergymonitor.org/u/teagueAMX)\ **Replies:** 4\ **Last updated:** [2 October 2019 01:26 UTC](https://community.openenergymonitor.org/t/saying-hi-from-the-us/12058 "2019-10-02T01:26:54Z")
Hi saying hello. Seems there’s a lot to dig into here. I’ll be reading all the great material you folks have made available. So my background I’m on standard grid electricity now but am very serious about solar, so what… --- ## [Bias offset](https://community.openenergymonitor.org/t/bias-offset/11982)
**Author:** [@herman](https://community.openenergymonitor.org/u/herman)\ **Replies:** 9\ **Last updated:** [25 September 2019 12:32 UTC](https://community.openenergymonitor.org/t/bias-offset/11982 "2019-09-25T12:32:10Z")
hi, I’m just started with “openEnergie monitoring” and have already a question. I create the AC input following the schema Following the schema on the OpenEnergie Page https://learn.openenergymonitor.org/electricity-… --- ## [What do I need for an electricty monitor?](https://community.openenergymonitor.org/t/what-do-i-need-for-an-electricty-monitor/10812)
**Author:** [@gck303](https://community.openenergymonitor.org/u/gck303)\ **Replies:** 7\ **Last updated:** [1 May 2019 20:29 UTC](https://community.openenergymonitor.org/t/what-do-i-need-for-an-electricty-monitor/10812 "2019-05-01T20:29:42Z")
I am slightly confused about how to get my initial setup working. To monitor my electric supply (via a meter sensor and clip on sensor) what hardware do I need? Obviously I need the Pi, and sensors. But what else? --- ## [Month and Year usage the same?](https://community.openenergymonitor.org/t/month-and-year-usage-the-same/9835)
**Author:** [@Wholepunch](https://community.openenergymonitor.org/u/Wholepunch)\ **Replies:** 3\ **Last updated:** [22 January 2019 11:23 UTC](https://community.openenergymonitor.org/t/month-and-year-usage-the-same/9835 "2019-01-22T11:23:24Z")
Weird one, all help welcomed! As you can see from the attached screenshot, the default app is working fine for me apart from it shows month and year consumption the same, for some reason. The box has been running approx.… --- ## [Grid use from Pulse Count](https://community.openenergymonitor.org/t/grid-use-from-pulse-count/8754)
**Author:** [@Wratty](https://community.openenergymonitor.org/u/Wratty)\ **Replies:** 0\ **Last updated:** [8 October 2018 11:49 UTC](https://community.openenergymonitor.org/t/grid-use-from-pulse-count/8754 "2018-10-08T11:49:18Z")
Hi - just getting set up and learning my way around. I have the pulse counter which I am hopeful to give me an accurate amount drawn from the grid using the Grid Use App. I have set up the following having search the i… --- ## [Data posted to emoncms not logged into INPUTS](https://community.openenergymonitor.org/t/data-posted-to-emoncms-not-logged-into-inputs/8690)
**Author:** [@marciokoko](https://community.openenergymonitor.org/u/marciokoko)\ **Replies:** 0\ **Last updated:** [2 October 2018 21:53 UTC](https://community.openenergymonitor.org/t/data-posted-to-emoncms-not-logged-into-inputs/8690 "2018-10-02T21:53:00Z")
So Ive setup the emoncms on my server and posted the example power1:100…power3:300 JSON POST and it logged in my INPUTS. Now Im trying to send data from my arduino and it seems to post fine, but when I go to the INPUTS … --- ## [Requests. Requirements](https://community.openenergymonitor.org/t/requests-requirements/7095)
**Author:** [@danbates](https://community.openenergymonitor.org/u/danbates)\ **Replies:** 2\ **Last updated:** [9 April 2018 10:26 UTC](https://community.openenergymonitor.org/t/requests-requirements/7095 "2018-04-09T10:26:26Z")
Hi guys, I’d like to point someone who works for an off-grid energy company towards openenergymonitor. They need to know if OEM can provide a solution to their needs. What’s your preferred method for first contact like … --- ## [Emontx v2 + nanodeRF posting directly to emoncms](https://community.openenergymonitor.org/t/emontx-v2-nanoderf-posting-directly-to-emoncms/7106)
**Author:** [@jimjamjahaa](https://community.openenergymonitor.org/u/jimjamjahaa)\ **Replies:** 2\ **Last updated:** [5 April 2018 14:05 UTC](https://community.openenergymonitor.org/t/emontx-v2-nanoderf-posting-directly-to-emoncms/7106 "2018-04-05T14:05:53Z")
Following on from Temperature sensor address search not working, how to debug? New to arduino but not programming and Rf12\_crc failing but rf12demo works flawlessly? I have an emontx v2.2, a nanodeRF and an emonGLCD I … --- ## [US Mains Voltage Meter Wall Wart Arduino](https://community.openenergymonitor.org/t/us-mains-voltage-meter-wall-wart-arduino/6022)
**Author:** [@Korishan](https://community.openenergymonitor.org/u/Korishan)\ **Replies:** 10\ **Last updated:** [25 December 2017 19:19 UTC](https://community.openenergymonitor.org/t/us-mains-voltage-meter-wall-wart-arduino/6022 "2017-12-25T19:19:27Z")
Hey all. First time poster. I’ve read through all the installation procedures for making an arduino version of the openenergymonitor using the emonLib for the Arduino. I have gotten 2 SCT-013-000 probes and have them wo… [Next page](https://community.openenergymonitor.org/c/getting-started/faqs/44.md?page=1)