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Hi, My pylontech battery in ESS victron not discharging under 90 %, but SoC is set for 40%.
I want to charge battery only from PV. Instalation start work last week, Is this normal ?
3 modules of US300C and vivtron multiplus II 3000/48
How to fix this ? please help
Hi,
it may be that you have activated the "optimized, with battery life" mode in the ESS. I'm not sure, but the ESS may not discharge the battery further if it assumes that the battery cannot be fully charged again in an acceptable time. However, this value is adjusted dynamically.
There are two SoCs in the ESS for this. Once the one set by you and once the actual "available" at the moment.
Best regards
Hannes
It mostly likely is yet another case of poorly configured PV inverter with the docs not being followed.
In any case, there is insufficient information here about the setup to use anything other than spidey senses to guess the usual suspects.
So this is ESS parametrs, I only changed SOC for 40 %, other parametrs is from defoult.
Do you thin I should change the mode ? Or maybe battery need 2 weeks to calibrate.
If so, disable them and see if the issue resolves. If not, I suspect it's an integration issue with your PV inverter.
Is the PV inverter assistant installed?
Hi @mk1,
Another setting that can cause this behaviour is the 'sustain voltage' which is configured in the ESS assistant in VE.Configure - the documented settings are available here - https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom#veconfigure_settings
A way to possibly test this is to disconnect the grid and then see if the battery discharges. If it does, let it discharge quite a bit, down to say 50% SOC, and then reconnect the grid. If the battery starts charges back up to ~90% again from the grid, then there is a pretty good chance that it is the sustain voltage setting that is set too high.
It needs to be reduced from the Victron default for Pylontech batteries.
I just had a closer look, and I could see that something very strange is happening on your L1 phase in the first image you posted. Is there a chance that this energy meter has been incorrectly wired inside your switch box?
I can't see any good reason why the L1 should be exporting equal an opposite to the other two phases. That energy meter incorrectly wired might explain the behaviour you are seeing as well. 
And if PV produce energy then mesurment is correct but withut pv export when system import energy from grid permanently shows export on L1,
Can I do access for you to this instalation and you Can check whats is going on ?
Do you have 1 or 3 MultiPlus? Do you have a grid meter (EM24 or ET340)?
Check the charge/discharge limits of the Pylontech (device list > Pylontech > parameters or something like that)
Make some mit Screenshots of the settings in the Cerbo and maybe upload the MultiPlus VE.config settings.
Check the settings in the Cerbo in System setup > AC input 1, this has to be set to "grid", default is "not available".
Hi @mk1 your system seems to think it's a 1 phase system...
did you install the ESS assistant to all units?
I thing so... I establish 3 phase system using VE bus configure and then I click on gx device to open VE config and then set all settings start ESS and click send to all devices.
Do you think This is the matter ? I should start ESS and set settings to each device induvidually ?
You need to install assistants in each device manually.
