There is an installation with a Growatt SPF5000TL HVM-WPV inverter and a Growatt Hope 3.3kWh lithium battery digitally connected (Protocol L51 on submenu 36 on Menu 05). Installed 02/08 and on Sunday 3rd Oct at 13:51hrs threw Error 08 for first time (High Bus Voltage). There was a loss of grid the night before and eventually the battery was drained and charged from PV. Grid was restored about midday. A reboot cleared the error. On Monday 4th Oct at the exact same time Error 08 was reported. Again a reboot cleared the error. On Wednesday about midday the error reocurred. Strange because there is digital coms with the battery, so how is the bus voltage rising?

Observation shows that this Error happens when the battery nears or reaches 100% SOC. What is bizarre is that all the charging parameters are determined by the battery so why the mismatch? Growatt had a supposed firmware with a fix but this failed. It got me thinking about issues with Pylon and Voltronics/Phocos where the inverter would report a Warning 67 which supposedly means that the battery is not charging. BMS would tell the inverter to stop charging but the inverter reckons that the battery is not full. To resolve the argument Warning 67. It is said this error on the Pylon/Voltronics/Phocos is a result of the the inverter and BMS referencing different parameters: Highest cell voltage v lowest cell voltage. At the end of the day when the new battery balances the two match. I have not seen this on such installations so either ignore the warning. Victron had an interesting approach to this issue. It would seem the Chinese engineers thought they could deliver a 15 cell lithium battery instead of 16 and as such the software guys still based their parameters on 16 cell leading to a very high bulk of 53.5V. Victron GX limits this to 52V.

I notice that the form factor of the Growatt Hope 3.3kWh seems to be Pylonish. No charging parameters are set manualy on digital coms. The battery will shut down in 20min if the wrong protocol is assigned on the inverter. But a view of settings 19 and 20 are quite high for Lithium in my layman view. They are 56.8V. The battery specs say it has an operating voltgage of up to 57V but still. Could it be therefore that the unreliable voltage by high freq inverters could be sending the voltage way higher than 56.8V?

I intend to disable Li on Settng 05 to enable me to change 19 and 20 to say 52V and renable Li coms to see if the BMS will change these settings. Growatt says the cause of Error 08 is complex. So we are looking at an inverter replacement perhaps.

Anyone with thoughts on this error? Component failure perhaps speaking to Growatt quality?

Hi I also have a Growatt 5kw inverter with a hope 3.3 kw lithium ion battery.Mine is showing an error 52 Low bus bar voltage.It happens normally in the morning around 5.

Kind regards .

Stephan