# \#battery **URL:** https://community.openenergymonitor.org/tag/battery/206.md [Latest](https://community.openenergymonitor.org/latest.md) · [Categories](https://community.openenergymonitor.org/categories.md) · [Tags](https://community.openenergymonitor.org/tags.md) --- ## [DIYBMS v4](https://community.openenergymonitor.org/t/diybms-v4/11292)
**Author:** [@stuart](https://community.openenergymonitor.org/u/stuart)\ **Replies:** 5346\ **Last updated:** [27 September 2026 12:28 UTC](https://community.openenergymonitor.org/t/diybms-v4/11292 "2026-09-27T12:28:50Z")
Discussion of DIYBMS version 4 Source code and files (GITHUB open once project is launched) --- ## [Battery for solar PV - thoughts on if it's worth it?](https://community.openenergymonitor.org/t/battery-for-solar-pv-thoughts-on-if-its-worth-it/1880)
**Author:** [@mattjgalloway](https://community.openenergymonitor.org/u/mattjgalloway)\ **Replies:** 16\ **Last updated:** [1 September 2026 14:32 UTC](https://community.openenergymonitor.org/t/battery-for-solar-pv-thoughts-on-if-its-worth-it/1880 "2026-09-01T14:32:39Z")
I had PV installed in mid-August, and at the time the installer said a battery wasn’t worth it because we’re only 2.56kWp (yeh, tiny I know!). And I think he was right, since that was the Tesla Powerwall that they sold. … --- ## [Are there battery systems you can control with Home Assistant or an API?](https://community.openenergymonitor.org/t/are-there-battery-systems-you-can-control-with-home-assistant-or-an-api/29765)
**Author:** [@Dan\_Grey](https://community.openenergymonitor.org/u/Dan_Grey)\ **Replies:** 1\ **Last updated:** [21 February 2026 10:00 UTC](https://community.openenergymonitor.org/t/are-there-battery-systems-you-can-control-with-home-assistant-or-an-api/29765 "2026-02-21T10:00:00Z")
Having discovered forecast.solar, I am wondering if Home Assistant could be used to set the charge level overnight so there’s enough room to store the forecast solar output the next day. Are there domestic BESS systems t… --- ## [Emonhub interfacer for Pylontech BMS?](https://community.openenergymonitor.org/t/emonhub-interfacer-for-pylontech-bms/29315)
**Author:** [@Martin\_Robinson](https://community.openenergymonitor.org/u/Martin_Robinson)\ **Replies:** 5\ **Last updated:** [1 December 2025 15:34 UTC](https://community.openenergymonitor.org/t/emonhub-interfacer-for-pylontech-bms/29315 "2025-12-01T15:34:24Z")
Has anyone written an emonhub interfacer for getting data from the Pylontech BMS and logging to EmonCms? I’ve written a standalone python script that reads data from the Pylontech console port and posts to emoncms.org, … --- ## [ActiBMS - Discussion about the DIY active balancer BMS](https://community.openenergymonitor.org/t/actibms-discussion-about-the-diy-active-balancer-bms/12445)
**Author:** [@hitech95](https://community.openenergymonitor.org/u/hitech95)\ **Replies:** 82\ **Last updated:** [15 March 2025 08:36 UTC](https://community.openenergymonitor.org/t/actibms-discussion-about-the-diy-active-balancer-bms/12445 "2025-03-15T08:36:11Z")
Hi, inspired by the new v4,I have decided to start working on a possible V5. I have re-created the PCB to add Active Balancing using the Inductive process. I have decided to use the ETA3000 chip, but it would have bee… --- ## [Solar PV + battery - do I need a diverter?](https://community.openenergymonitor.org/t/solar-pv-battery-do-i-need-a-diverter/17874)
**Author:** [@ben.jones12](https://community.openenergymonitor.org/u/ben.jones12)\ **Replies:** 50\ **Last updated:** [20 September 2024 01:07 UTC](https://community.openenergymonitor.org/t/solar-pv-battery-do-i-need-a-diverter/17874 "2024-09-20T01:07:28Z")
Hi, I am building a new house and am going to install 7.4kW of PV with a 5kW inverter, and a Tesla Powerwall 2 (with 13.5kWh usable storage). In my current home I have 3.4kW of PV and a DIY PV diverter based on the Emo… --- ## [Victron Energy Battery PYMODBUS error](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711)
**Author:** [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Replies:** 35\ **Last updated:** [4 July 2023 14:07 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711 "2023-07-04T14:07:38Z")
Hi, I’ve got a battery and solar and been using the MySolarBattery app for some time with no issues. I’ve been pestering my installer (PureDrive) to help me get State of Charge info as I know they are using Victron Ener… --- ## [Advice on monitoring house with solar PV and battery storage](https://community.openenergymonitor.org/t/advice-on-monitoring-house-with-solar-pv-and-battery-storage/23503)
**Author:** [@nielk](https://community.openenergymonitor.org/u/nielk)\ **Replies:** 9\ **Last updated:** [1 May 2023 19:28 UTC](https://community.openenergymonitor.org/t/advice-on-monitoring-house-with-solar-pv-and-battery-storage/23503 "2023-05-01T19:28:11Z")
Hi there. I have a newly installed Solar PV system with battery storage 20 x 380W panels feeding into a Growatt 6kW inverter PureDrive PuresStorage II 10kW AC-connected battery The battery comes with a monitoring app … --- ## [Octopus flux tariff](https://community.openenergymonitor.org/t/octopus-flux-tariff/23236)
**Author:** [@miker](https://community.openenergymonitor.org/u/miker)\ **Replies:** 4\ **Last updated:** [12 April 2023 14:15 UTC](https://community.openenergymonitor.org/t/octopus-flux-tariff/23236 "2023-04-12T14:15:44Z")
Back in Q3 2021 I moved from the Octopus Agile tariff to Octopus Tesla. It’s been a very cheap 18 months (£30 pcm, including home car charging and heating). Octopus are ending the Tesla tariff, or maybe Tesla is, and rep… --- ## [6 Channel Energy Monitoring: emonTx V4 can read status of charge of batteries?](https://community.openenergymonitor.org/t/6-channel-energy-monitoring-emontx-v4-can-read-status-of-charge-of-batteries/22557)
**Author:** [@gnieddu](https://community.openenergymonitor.org/u/gnieddu)\ **Replies:** 3\ **Last updated:** [23 January 2023 10:14 UTC](https://community.openenergymonitor.org/t/6-channel-energy-monitoring-emontx-v4-can-read-status-of-charge-of-batteries/22557 "2023-01-23T10:14:06Z")
I would be interested in purchasing https://shop.openenergymonitor.com/6-channel-energy-monitoring-emontx-v4/ 6 Channel Energy Monitoring: emonTx V4 , I ask if it can be used to monitor the state of charge of batteries. … --- ## [Estimating battery savings from solar PV data and domestic usage](https://community.openenergymonitor.org/t/estimating-battery-savings-from-solar-pv-data-and-domestic-usage/20399)
**Author:** [@Dr\_W](https://community.openenergymonitor.org/u/Dr_W)\ **Replies:** 19\ **Last updated:** [16 June 2022 12:11 UTC](https://community.openenergymonitor.org/t/estimating-battery-savings-from-solar-pv-data-and-domestic-usage/20399 "2022-06-16T12:11:47Z")
hi, I’d like to try and work out whether it makes financial sense to install a battery. We have solar PV already installed (generating ~4400 Khw / year), and an air source heat pump, and our annual electricity consumpti… --- ## [Auto shutdown (when USB supply voltage drops)](https://community.openenergymonitor.org/t/auto-shutdown-when-usb-supply-voltage-drops/19983)
**Author:** [@mdagli1](https://community.openenergymonitor.org/u/mdagli1)\ **Replies:** 9\ **Last updated:** [4 April 2022 14:36 UTC](https://community.openenergymonitor.org/t/auto-shutdown-when-usb-supply-voltage-drops/19983 "2022-04-04T14:36:03Z")
hello, I’m making a basic adhoc USB UPS using 4 x NiMH AA batteries to reduce the likelihood of SD corruption from main power trips. Is there a way of to automatically shut down the pi when the voltage drops tripping the… --- ## [Module calibrate](https://community.openenergymonitor.org/t/module-calibrate/18436)
**Author:** [@Xtlife](https://community.openenergymonitor.org/u/Xtlife)\ **Replies:** 3\ **Last updated:** [15 September 2021 11:42 UTC](https://community.openenergymonitor.org/t/module-calibrate/18436 "2021-09-15T11:42:27Z")
How to reset module once mistakenly set? --- ## [diyBMS 4 - How to change network my BMS is connected to?](https://community.openenergymonitor.org/t/diybms-4-how-to-change-network-my-bms-is-connected-to/15587)
**Author:** [@acollins22](https://community.openenergymonitor.org/u/acollins22)\ **Replies:** 3\ **Last updated:** [9 August 2021 20:48 UTC](https://community.openenergymonitor.org/t/diybms-4-how-to-change-network-my-bms-is-connected-to/15587 "2021-08-09T20:48:51Z")
Hi, I have setup diyBMS on my bench and connected to the house wifi. Now I want to move it to its final destination and need to change the network. I’ve looked through its web page but can’t find anything. How do I do … --- ## [Doubt about new release](https://community.openenergymonitor.org/t/doubt-about-new-release/17371)
**Author:** [@Pablo\_montanez](https://community.openenergymonitor.org/u/Pablo_montanez)\ **Replies:** 0\ **Last updated:** [30 March 2021 20:53 UTC](https://community.openenergymonitor.org/t/doubt-about-new-release/17371 "2021-03-30T20:53:46Z")
Hello Stuart, I was suffering on github and saw that there is a new release and it is possible to add a clamp meter to wemos mini, is it necessary update the cell modules or only the controller? Thanks in advance. --- ## [Calculating the pence per kwh stored in my battery](https://community.openenergymonitor.org/t/calculating-the-pence-per-kwh-stored-in-my-battery/17171)
**Author:** [@britkat](https://community.openenergymonitor.org/u/britkat)\ **Replies:** 1\ **Last updated:** [15 March 2021 10:52 UTC](https://community.openenergymonitor.org/t/calculating-the-pence-per-kwh-stored-in-my-battery/17171 "2021-03-15T10:52:47Z")
I have just installed solar battery storage which is linked to octopus agile tariff and solar panels, so can charge from either. I’m trying to get the processing right to calculate the current p/kwh of the energy stored … --- ## [Input configuration for battery\_discharge to show total household consumption](https://community.openenergymonitor.org/t/input-configuration-for-battery-discharge-to-show-total-household-consumption/16225)
**Author:** [@NickC](https://community.openenergymonitor.org/u/NickC)\ **Replies:** 6\ **Last updated:** [9 December 2020 16:22 UTC](https://community.openenergymonitor.org/t/input-configuration-for-battery-discharge-to-show-total-household-consumption/16225 "2020-12-09T16:22:14Z")
I’ve 3 sensors: grid, solar, battery. I’ve configured the battery charge/discharge feeds from a single sensor and I’ve managed to configure the input so both feeds are positive values, based on another post in here. The… --- ## [DIY Lithium Battery Balancer and monitoring (BMS)](https://community.openenergymonitor.org/t/diy-lithium-battery-balancer-and-monitoring-bms/5594)
**Author:** [@stuart](https://community.openenergymonitor.org/u/stuart)\ **Replies:** 1159\ **Last updated:** [10 January 2020 07:11 UTC](https://community.openenergymonitor.org/t/diy-lithium-battery-balancer-and-monitoring-bms/5594 "2020-01-10T07:11:23Z")
I’m currently in the process of designing and building a battery balancer and monitoring system/circuits for a home made DIY Powerwall. I’m aiming to use this forum to log the design decisions and gather comments and im… --- ## [OpenEVSE, Solar and storage](https://community.openenergymonitor.org/t/openevse-solar-and-storage/5393)
**Author:** [@Pukka](https://community.openenergymonitor.org/u/Pukka)\ **Replies:** 2\ **Last updated:** [19 October 2017 00:54 UTC](https://community.openenergymonitor.org/t/openevse-solar-and-storage/5393 "2017-10-19T00:54:04Z")
Hi all, A questions about the OpenEVS and NodeRed. we have a storage battery for the house and the info going into our emonpi about charge rates and battery % is it possible to add to modify the nodered so it would char… --- ## [emonTx V3 battery life?](https://community.openenergymonitor.org/t/emontx-v3-battery-life/2555)
**Author:** [@glyn.hudson](https://community.openenergymonitor.org/u/glyn.hudson)\ **Replies:** 4\ **Last updated:** [24 August 2017 21:53 UTC](https://community.openenergymonitor.org/t/emontx-v3-battery-life/2555 "2017-08-24T21:53:19Z")
Has anyone got real world data on how long the emonTV3 lasts when powered from 3 x AA batteries? Where possible I always install using an AC-ACadapter to get more accurate real-power readings. However, I am aware that in… --- ## [Hybrid power controller](https://community.openenergymonitor.org/t/hybrid-power-controller/2983)
**Author:** [@Nikhil\_R](https://community.openenergymonitor.org/u/Nikhil_R)\ **Replies:** 1\ **Last updated:** [2 February 2017 14:25 UTC](https://community.openenergymonitor.org/t/hybrid-power-controller/2983 "2017-02-02T14:25:22Z")
I’m Nikhil currently pursuing BTech in Electrical and Electronics engineering, this is regards to my final year project, I need proper guidance and suggestion from you guys to do this project Problem Statement: Design a … --- ## [emonTH V2 - now in the shop](https://community.openenergymonitor.org/t/emonth-v2-now-in-the-shop/1696)
**Author:** [@glyn.hudson](https://community.openenergymonitor.org/u/glyn.hudson)\ **Replies:** 25\ **Last updated:** [30 November 2016 00:35 UTC](https://community.openenergymonitor.org/t/emonth-v2-now-in-the-shop/1696 "2016-11-30T00:35:57Z")
Update emonTH V2 is now in the shop: :tada: Following on from my post on sensor evaluation: The first prototype of emonTH V2 with Si72021 sensor is up and running :smiley: Spot the tiny sensor with the white t…