FYI SOK LiFePO4 batteries

[redbaron]

@redbaron I forget the thread we we had discussed the integration of the BMV-712 data into HA, but ....

after a few years, I finally to around to this, I put together a Wemos D1 mini V3 with a DC power shield and connected it via a JST-PH connector to the VE.Direct port on the BMV-712 per the Schematics section of the instructions. I installed esphome on the D1 mini per the esp8266-example.yaml example (creating secrets.yaml as appropriate). I connected the DC power shield to 12V (power and ground wires).

Power it up and I got the house battery data loaded into MQTT. Now to update HA to display that data. Didn’t take very long to setup. I still need to clean up the install now that I know it works.

That’s a good method. I currently am using a library I found that utilizes BLe data and puts it in MQTT.

I have converted my existing AGM auto gen start to use SOC by disabling AGs for battery in the Silverleaf and allowing HA to control.

What I have noticed is that BLe data is accurate within 5 minutes but does get about 30% drop rate. I don’t think this matters, but your solution would be far more accurate.

 

[Joe Dutchstar]

@redbaron I forget the thread we we had discussed the integration of the BMV-712 data into HA, but ....

after a few years, I finally to around to this, I put together a Wemos D1 mini V3 with a DC power shield and connected it via a JST-PH connector to the VE.Direct port on the BMV-712 per the Schematics section of the instructions. I installed esphome on the D1 mini per the esp8266-example.yaml example (creating secrets.yaml as appropriate). I connected the DC power shield to 12V (power and ground wires).

Power it up and I got the house battery data loaded into MQTT. Now to update HA to display that data. Didn’t take very long to setup. I still need to clean up the install now that I know it works.

Wow reading this makes me release just how ignorant I am on this topic. Like a foreign language...

 

[MemoriesByTheMile]

Wow reading this makes me release just how ignorant I am on this topic. Like a foreign language...

It is a foreign language

 

[flyboy013]

What I have noticed is that BLe data is accurate within 5 minutes but does get about 30% drop rate. I don’t think this matters, but your solution would be far more accurate.

I got around to finishing the install of the Wemo D1 mini yesterday. One of the things I noticed was that the HA MQTT integration automatically picked up all the parameters that the BMV-712 was outputting, which makes it that much easier to integrate into HA.

I noticed that the data was only updating every 10 seconds. I looked back at the esphome configuration file and noticed that there was a "throttle" command which limited it to 10 second updates. I removed the throttle and now get updates every second.

Screenshot 2024-05-31 at 11.04.43 AM

 

[redbaron]

I really do like how easy HA integrates with MQTT. I need to look into the alternatives to the BLE that I am using, as my data is only reliable at 30 second intervals.

This is the DC card I made with data from the Victron Shunt.