Hello. I have 3-Phase instalation with Multi RS inverters. I have disabled grid feed-in and turned on ESS on Optimised w/o battery life. This is same on all three inverters. It was working great for about 3 weeks but now i have noticed that it started charging from grid with 10A per inverter. So together it is 30A which is significant. Is there some way to stop it ? Only way i can stop charging is conditional disconnect (now would be cycling a lot because very little PV production basically discharge/recharge all the time when grid is on or off) or switch ess to External control. But that discharges battery up to the point it turns off the inverters even with grid connected. Minimum SOC is way lower than current SOC measured with smart shunt. And it has no BMS connected.
Edit : it is possible to lower current by adjusting dvcc current limit. It appears to be 10% of max current.
Edit 2: seems like battery life mode even when disabled. Manually toggling equalisation seems to help but oly for a day or two. Then it starts slowly recharging again.
No. And nobody replied here either. It is not problem now in the winter just loosing a bit of efficiency. But in summer it will suck.
I actually wanted to upgrade my old Mutliplus 2 instalation to MultiRS because of less noise but will hold on until this is fixed.
Only thing i found that helps is triggering equalisation from Victron connect. Then it stops charging and works normally. Tried automating it via NodeRed but no luck.
If you find some help please reach back. I am desperate for solution.
Conditional disconnect from grid wont help either. It will just cycle between charging and discharging .
Seems to be some firmware bug. I did not find anything in Venus OS which could trigger it (there are things for ESS for old VE Bus integration anyway.
Posted similar issue today. During summertime the RS was running well. This phenomena started with sun conditions not able to load the battery to full conditions. Also think it is a software bug. This behavior looks like what the manual describes for acid/lead batteries. Seems the RS/Cerbo is thinking we have this kind of battery. Hope Victron is aware and willing to solve it. My experience so far is that the MP2’s are more stable than the RS (have installed 6 MP2 and 2 RS). If I get a solution will let you know.
The more people we get in this thread the better. I noticed Victron staff is active on this forum . So maybe if more people talk about it they will notice.
Maybe you have enough sun to charge up the battery to full every other day? Because then it works for me as well. But When there is 3 or more days of no sun then it starts charging.
We had this month about 3 weeks of fog so it charged to full every few days then dumped it to loads and repeat. Which is kind of wasted energy.
Thanks for sharing. With sufficient sun mine works well also. Frequency of charging from grid (no/less sun) is around 1 per 2 weeks. Please keep us updated if your experience similar issues.
The steep rise in the centre to 100% was charging the first battery from the grid, from that moment a second battery was connected that took a couple of days, during those days the first battery was kept at 100%
For me it looks like this. None of the days there was enough solar to charge battery to 100%. On the beginning of the month i tried the “equalisation” thats why there is the gap. Then i gave up. I dont want to be babysitting my solar instalation.
That’s a charging to 100% once 2-3 days… And it seems that you set the minimum SOC to 20%.
Is it possible that when it starts slow charging the SOC to be slightly below 20%, e.g. 19 or 18?
That would be consistent with the slow charging mode below, only that it should stop back at 20%, not go all the way to 100%…
And you also told us that you have it without BatteryLife…
Another question… Do you have a Cerbo-like device in your configuration or it’s only the Multi RS with the batteries.
In other words, the battery state is the one handled inside Multi RS or the one handled inside Cerbo?
And i have to tell you in forward that i had serial battery installed. I can not connect to it via ssh now to delete it but i have disabled start up scripts.
There is no BMS connected right now. Just using Smart shunt now.
It started charging to 100% right after sun went down. I was checking before values in GUI V2 if there is slow charge or sustain going on but values were off.
I’ve the feeling that you have a quite particular system there… 61.5V during final stage of charging?
Either it’s not a LiFePo4 battery, or it’s with more than 16 cells. 18 cells maybe?
Am I right?
Can you post the battery settings from the VictronConnect application?
Thanks.
Yes unfortunatelly i have 18S Battery. I had an battery pack already and upgraded from Multi 2 5000 to Multi RS. And i was looking into datasheed and there was an maximum inverter voltage 62V and also max charge voltage 60V and 62 with equalisation. But so far if i keep battery temp low enough it charges battery nicely. Pitty i can not set 62V in Lithium mode.
Disable “Automatic equalization”. You don’t need it with LiFePo4 batteries.
You have it set “Every day” and that’s why it’s charging your battery from grid every 1-2 days.
Okay i hqve changed it will see thank you a lot ! .
I have tried to use it before as a way to increase charge voltage (it is only setting that allows 62V) but left it on because it seemed not to work anyway. Without temp compensation it didnt go above 60.1V.
I guess it should limit even with temp compensation on right ?
Sadly it is not possible as pack is from EV and it haf to be cut into parts and welded custom studs to make it work.
From my experience lifepo4 needs at leaat 3.43 to properly balance . Which is 61.74V for this pack.
You can see on the charging surve i posted it is just startong to take off.
With old Multi i had it charging to 62.1V. But ineeded something quieter and little more power. And Multi RS is a beast. It works so nice besides this charging issue. And ESS regulation is crazy fast . Absolutely no feed in or consumption from grid.
If you can give me better advice to set it up than temp compensation i am open to any advice . Just cant change the pack.
thank you a lot ! .