I realise this question has been asked a few times in this community but they all occurred some time ago and in one response @Guy Stewart (Victron Community Manager) said that it has been resolved in a firmware update. I have the latest firmware:
- BYD Premium LV battery
- BMU firmware v1.22
- MPPT RS 450/100 (firmware v1.10)
- Multiplus II GX 48/5000 (firmware 498)
- GX firmware v2.92 Large
Each time the MPPT was displaying #67 BMS connection lost and the MPPT disappeared off the Remote Console pictogram. A reboot of the Multi fixes the issue. The first time the error occurred was in October 2022, then once a few weeks ago, and today I got the error twice. After the second occurrence I reseated the VE.Direct cable in the Multi and the MPPT and will see if that improves matters.
One thing to note is that the error seems to occur when the Multi is changing state – the first time was back in October when the battery reached 100%. Today the error occurred when the Multi was switching ESS state from:
- "Optimized + BatteryLife: SoC below dynamic SoC limit", to
- "Optimized + BatteryLife: self consumption"
This can't be just a coincidence, surely?