I have already had the opportunity to thank Stuart Pittaway for the excellent work that I can witness. I recently finished the 5th and 6th li-ion cell modules and added them in parallel to my service battery. In total there are now 6 modules of 14 cells in series, connected in parallel. That is, there are 84 cells in a 14S6P configuration. The usable capacity is approximately 11kWh. The controller is esp32 and each cell has its diyBMS module 4.40. The controller and modules version is from last November with the communication set to 9K6. It’s communicating by MQTT with my Home Assistant with a refresh rate of about 60s, identical to what I had before changing the communication speed. It has a very low number of errors, the roundtrip is 4444ms.
I checked the following situations that I would like to post here:
- the voltage values of the last 4 modules (80, 81, 82 and 83) are only updated initially after powering esp32. Afterwards the values are never updated again. This is reflected in the Range 5 values on the WEB page and also in the values sent via MQTT. Also, the sequence of blinks in these modules is much rarer than in the others.
- Despite the low number of OOS errors (less than 1 per day!), there is a very big difference between sent and received (eg 44079 VS 31104). This is normal?
- Since communication between modules is much faster, would it be possible to also increase the sending rate via MQTT?
I apologize for my english and if I am not supposed to ask these questions here.