robot_zombie

there is a function for this in the pV master app. connect to the inverter, wait for it to pick up the details, then go to settings -> advanced settings > (may ask for installer password, goodwe2010 iirc), scroll down to "immediate charge to battery", turn it on, the box under that then lets you enter the desired SOC to charge to, enter a value here and hit the tick. these settings get applied instantly, when you go back it prompts to restart the inverter, say NO (the app is confusing, most settings are applied without needing to restart). battery should now be charging from grid!

thanks for the reply. Yeah, in hindsight, I probably should have gone with the seplos, but the Jk was cheaper and had better specs. There are some projects around now getting the JK to talk to goodwe, however to complicate issues further I am planning on building another pack to run in parallel, how to get two BMS's talking together!! I have read a few reports of others using the self define mode but yes it seems fairly rare I might hassle goodwe support about it but I don't really expect them to be able to offer much.

first post! nice forum! So, I have a setup running a goodwe 5048d-ES, 9.8 kwhr (48V nom, 15S, 204AH) Lifepo4 pack), and 6.1kw PV, in a grid connected setup. The battery is running a JK BMS, and since it does not support comms with the inverter, the inverter is setup in self-define mode. Everything is running well, but I have a few niggling issues with the self-define charging settings. I have the inverter set to a max charge voltage of 51.4V (75A)- conservative ~3.43V/cell and 51V float voltage (despite this being a little low, I am still getting 95+% of the pack capacity - one of the cells in the pack is a little unbalanced right now, and if I set higher, the BMS disconnects the charging in the last few % due to one cell running away). The problem I have is the inverter battery voltage never gets to the same voltage as the BMS, it is always lower. So when charging, the inverter never goes into float mode. For example, a sunny day, the battery charges at the maximum A for awhile, then starts to taper off in the last 30% or so of the SOC. The BMS has the battery voltage hitting 51.4-51.6 as the current drops to close to 0A and the SOC (BMS and inverter reading) are approaching 100% (97-98%). However the battery voltage recorded by the inverter will never go over 51.1 - it goes to 51.1V and sits there! if I increase the max charge voltage, the same thing happens, the inverter battery voltages increases, but is always 0.3-0.4V lower than the BMS records, the current increases and then drops back to zero (as the pack comes up to the new voltage quickly, because it is already 98+% charged). So the inverter never switches to float mode, and it seems it is impossible for it to switch, because it always reads the battery as a lower voltage than reality for some reason. Regardless this is working fine as is, and I dont think sitting at 3.43-3.45 v/cell 'float'' in the afternoon is causing much damage to the cells, but ideally I would like it to hit the max charge voltage, then switch to float mode allowing the cells to 'rest' at just under 3.4V. Has anyone else with this inverter / self define mode seen this type of behavior? The other issue I have is, when the battery is discharged (max DOD 90%, so battery hits 10% and discharge is cut off), over the next few hours the SOC will slowly drift back up (despite no power going back in) to 14%, then the inverter pulls more power from the battery until it drops back to 10% - so if the battery is empty early in the night, over the next 6-7 hours this process will slowly completely drain the battery until the BMS registers a LVDC and turns off discharge. Again, this issue isn't really causing me a problem because most of the time, the battery can last until morning or at least until 4-5AM! but it is pretty strange, and I think it could cause an issue in winter!! Anyone else seen something like this? aside from these issues the inverter seems like a great bit of hardware for the price (I paid $1800AUD), if only the software had more detailed options for charging!!!!!! cheers!