My battery was set to “keep batteries charged” and there was a charging schedule. But at the end of it half hour before that ended. My battery started to discharge again. Draining the battery.
This happens to my setup randomly. I have
Further note, previous time it happened when i decided to sell some energy. For that i turned on dess, later turned it off and it kept discharging. Even when setting it to green mode, setting the mode to keep batteries charged or even charger only mode.
Do you have a grid meter?
Where are the loads connected?
Yes the grid meter is connected. All works fine until it does not. All loads except one are behind the multirs. The whole house is behind the multirs. It works fine most of the time, but sometimes it just randomly seems to start exporting.
Make sure it is configured correctly in the settings and check if the clamps (if you have any) are installed in the right direction and on the right phases.
Also check the settings to see if the AC loads are configured correctly.
They are installed correctly. The funny thing is, most of the time all is working fine, but somehow sometimes something triggers and all is being exported.
Just have a look now (I charged for a few hours just now, because the price was about 23 cents and in the evening it will rise to 48).
There is an solaredge inverter, so there is feedin on the essential loads, hence the 0W, but at 5:15 that is not there. Solaredge will be configured next week to report to the system. It works for days/weeks, and then all of a sudden it just feels like the target SOC is triggered (DESS). But DESS is disabled because I was so unhappy with what it was doing.
What grid meter are you using?
Is the position of the ac loads set correctly? should be on AC input&output. It’s weird that the AC loads on the AC in is blank.
Are you 100% sure? When they are on the wrong phase for example it will mostly work well until the system tries to compensate for power usage on the wrong phase, resulting in runaway behaviour.
This should help to make the situation more clear.
No, I am certain that the phases are correct.
I have 3 different colors in use, the direction of the clamps reports correctly.
Here you see L1, L2 and L3 being at a different load, and being regulated by the corresponding MultiRS. If they were switched it would not be able to set all phases at 0. I also checked the power per multiRS, that is corresponding to these numbers.
Why not? Essential loads can be measured in the multi RS. A grid meter is optional. You can check the grid meter by connecting a load on the AC in side.
Mac, first of all, thanks for taking the time trying to help me.
I say the cabling is correct because then it would not be correct, I would not be able to keep the phases at 0.
I changed the AcPowerSetpoint to -4000 for each multirs seperately, and the VM-3P75CT shows the corresponding phase to report the changes I made. Further the coloring of the cables is correct and I already checked that multiple times.
If the multirs would compensate on the wrong phase, the meter should show -2000 W on one phase and +2000 W on another. It however is regulating everything at 0, but sometimes the whole system just decides to drain my battery (all phases exporting with > 3kw). Turning it to charger only or passthrough is the only way to stop this.
This screenshot was taken when I set the setpoint of the multiRS that is responsible for L2 to -4000. I did this for each phase seperately.
So it correctly reports the correct phase at the meter, and also shows the correct direction of the current (-17.4A)
Perfect.
Assuming you are using DVCC What were the battery voltages and the CVL when the discharge happens?
Looks like in the 3rd screenshot the CVL goes down to about 53.6V and the system tries to get there by discharging the battery.
You should take a look in the battery BMS settings what could cause this.
Thanks, it seems indeed that something is going wrong there. This morning it happened again, around the 91% mark again. After disabling the float charge in the bms it stopped. Victron thinks the battery is in over voltage somehow, when actually all should be just balancing out.
I will investigate further, thanks for the hints so far.
The inverter just follows the CVL it receives from the BMS, the BMS is leading here.
