3 ms·

I'm currently looking for something to do this (bought one of these, it was junk and didn't work so I took it off) so I can have my Home Assistant installation

by XorNot 3y ago

I'm currently looking for something to do this (bought one of these, it was junk and didn't work so I took it off) so I can have my Home Assistant installation keep an eye on it and notify my phone when it gets below some threshold. Still looking for a solution, by the way, if anyone knows of something which will work (kind of thinking I want to go with ESPHome now though).

briHass 3y ago
Renogy sells a 10A charge controller (https://www.amazon.com/Renogy-Wanderer-Amp-12V-24V/dp/B07NPDWZJ7 https://www.amazon.com/Renogy-Wanderer-Amp-12V-24V/dp/B07NPD...) that frequently goes on sale for around $10. It has a RS232 port, and there are libraries for ESP devices and/or ESPHome that can read all of the (modbus) data from the controller. You need a serial adapter or level converter to adapt the serial voltages to 3V and a RJ-12 (6p6c) wire... or you could just buy their bluetooth module that does it for you. Typically used for solar panels, but you could always hook up a 18-20v power supply and let it manage/charge your battery. The nice thing about these controllers is that they can handle multiple battery types and have multi-stage charging algorithms.
x1sec 3y ago
I've written a basic Python script [1] to read the battery voltage from this device. More details here [2]. Could easily integrate with Home Assistant. Might give it a go actually. It reads the real time voltages, not voltages stored in the embedded device's memory (for when there is no BLE connectivity while it's running). If there is interest, I can work out this part too. [1] https://gist.github.com/x1sec/3af7efdcd3465aac09093081c32ba321 https://gist.github.com/x1sec/3af7efdcd3465aac09093081c32ba3... [2] https://doubleagent.net/hardware/ble/bluetooth/2023/05/23/a-car-battery-monitor-tracking-your-location-part3 https://doubleagent.net/hardware/ble/bluetooth/2023/05/23/a-...

by XorNot 3y ago

briHass 3y ago

Renogy sells a 10A charge controller (https://www.amazon.com/Renogy-Wanderer-Amp-12V-24V/dp/B07NPDWZJ7 https://www.amazon.com/Renogy-Wanderer-Amp-12V-24V/dp/B07NPD...) that frequently goes on sale for around $10. It has a RS232 port, and there are libraries for ESP devices and/or ESPHome that can read all of the (modbus) data from the controller. You need a serial adapter or level converter to adapt the serial voltages to 3V and a RJ-12 (6p6c) wire... or you could just buy their bluetooth module that does it for you. Typically used for solar panels, but you could always hook up a 18-20v power supply and let it manage/charge your battery. The nice thing about these controllers is that they can handle multiple battery types and have multi-stage charging algorithms.

x1sec 3y ago

I've written a basic Python script [1] to read the battery voltage from this device. More details here [2]. Could easily integrate with Home Assistant. Might give it a go actually. It reads the real time voltages, not voltages stored in the embedded device's memory (for when there is no BLE connectivity while it's running). If there is interest, I can work out this part too. [1] https://gist.github.com/x1sec/3af7efdcd3465aac09093081c32ba321 https://gist.github.com/x1sec/3af7efdcd3465aac09093081c32ba3... [2] https://doubleagent.net/hardware/ble/bluetooth/2023/05/23/a-car-battery-monitor-tracking-your-location-part3 https://doubleagent.net/hardware/ble/bluetooth/2023/05/23/a-...