Oh okay tnx. Are you able to feed back more than 22 amps through the AC-in?
Sorry for the late reply, Today I tested to manually feed back into the grid. I have set all 3 Multi RS to feed back into the grid with 6000W, plus I also have 8000 watts of PV power at the moment (SolarEdge 3phase PV inverter on AC-in), however it seems that just like in your case, the power is limited to 5000watt per phase, so about 20,5A per phase.
This is when I disable DESS, but I noticed that when DESS is active, this limit is not enforced as I have seen over 16.000watt in total feed back to grid.
So I am not sure were the problem lies. But my guess is with the Multi RS firmware. I am running firmware 1.20
Thank you very much for testing this! Now at least I know it’s not caused by my system or settings.
I’m really curious what would happen if, instead of 8 kW, you had—just as a theoretical example—30 kW of solar power. You’d then be feeding in about 15 kW, and the three Multi RS units would be charging with a total of 15 kW. So far, so good.
But what if your batteries are full and there are no loads consuming power? You can only feed 15 kW back to the grid, so what happens with the remaining 15 kW? It can’t be stored, and it’s not being used by any loads either. The Multi RS can’t do frequency shifting since it’s grid-connected and the PV system is on the AC-in side.
Do you have any idea what would happen in that case?
By the way, I tested this on both firmware version V1.20 and V1.22, and I didn’t see any difference.
Anyway, thanks again for testing! I’ll try enabling DESS now and see if that allows me to feed back more than 22A.
In that case most likely the system would just go over 15kW of grid feed in. The Multi RS tries to limit 5000watt per phase, but if it can’t consume any energy and the PV inverter is pushing out more than 5000watt per phase, it would just go over 5000watts.
There is just nothing built in the Multi RS that could limit the PV power (as long as the PV inverter is on the AC-in side, not AC-out)
Btw I started a new topic and did some more testing. I was able to go over 5000W grid feed in when I disabled my external grid current sensor, by setting a grid setpoint of -2600w while my PV inverter was also producing more than 3000w. So I had a total of -6000w on L1 while testing. But as soon as I enabled the external current sensor, grid feed in went back to -5000w (while setpoint was still at -6000w)
Yes, thanks a lot for testing and for creating the new topic! Great to see that Victron staff has noticed it. In the new topic, you described the issue much more clearly than I did. Hopefully we can find a solution for this soft limit.
I have the same issue again:
The system stops feeding in to the grid, when the battery SOC is 100@.
There is more than enough PV power available. This is caused by the dynamic ESS. When I disable dynamic ESS the RS’s start feeding back to grid from the PV.
Grid codes are in all three RS’s.
The problem is the same when I install official firmware 3.55 and also with firmware 3.60~60.
Hi all, thanks for the detailed failure description and apologies for not replying sooner. We’ll take a look!
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Hey,
i’ve send you a PN, can you reply with your site-id, then I can review that.
Just had a similiar situation, and this was caused by grid-sell prices beeing negative, so DESS put a feedin restriction to avoid feeding in and actually paying for it.
Hi,
My site: VRM Portal - Victron Energy
A few weeks ago the Multi RS’S stopped feeding in to the grid after a firmware update.
At that time I did not know I had to re-enter the grid code after every firmware update. After re-entering the grid code the system started to feed back in.
And it is still feeding in to grid when the battery is full.
But, with the very sunny weather in the Netherlands the last week, I noticed that the PV production from the MPPT trackers, started to shoot up and down from the moment the SOC reached 100%. Until that moment the production very steady. But after that it is very unstable. It has nothing to do with (partial) shading. It started at different moments in time in the last week. But every day at the moment the SOC reached 100%.
And it was not at hours with negative price.
I think this might have something to do with the same reason why the system stopped feeding in competely a few weeks ago from the moment when the batteries were full?
I wrote about this in another topic on the Victron forum. I put some screenprints in that topic also. I can not find that post at this moment.
I am not familiar with these forums. I have to find my way in it. Sorry.
I made a few new screenshots of the last two days. You can see that the fluctuations start at different times on both days. But exactly at the moment the SOC reached 100 %.
Vriendelijke groeten,
Auke de Groot
-------- Oorspronkelijk bericht --------
Hi, I’ve exactly the same problem. So if you need more sites for checking, don’t hesitate to contact me.
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Hello from Germany!
I noticed exactly the same thing on my system last weekend…
- 1x 1 phase MP2 48/5000
- 2x SmartSolar 250/85 (connected via CAN)
- 1x 500A Smartshunt
- 2x self-built batteries, each with a JK Inverter BMS, also connected via CAN.
Firmware on the Cerbo, whether latest stable or 3.60~66 at the time. MP2 firmware on 552, all other devices with the latest firmware. Various restarts, nothing helped.
In the settings via the Remote Console, all menu items under DVCC were also grayed out. What finally helped was to change the ESS mode from (my default) “Optimized without BatteryLife” to “Optimized with BatteryLife”, wait briefly and then back to “Optimized without BatteryLife”. As if the ESS has completely reset itself.
The menu items under DVCC were then also clickable again! Everything else had no effect and maybe this experience will help some of you and the developers. Since then, the system has been running as usual.
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This isn’t about Multiplus inverter/chargers, this is about the newer Multi RS 6000
However, the error seems to occur across all devices and is not limited to a specific device series. This will help everyone if the cause is found…
None of what you are describing has anything to do with this topic… I think you’re commenting on the wrong topic, this topic is about Multi RS grid feed in, not about DVCC.
I may have expressed myself unclearly, but I also had EXACTLY the problem described in the initial post and at the SAME TIME I also had the problem with the DVCC settings. Both out of nowhere, without changing anything in the system. Sometimes it’s details like this that lead a developer to the root of the problem. That’s why it doesn’t matter that only the MultiRS was mentioned in the initial post. Apparently several models are affected and this points to a general bug. I’m not going to open another post describing exactly the same problem when one already exists. Whether MultiRS or MP2 is irrelevant.
But it IS relevant that this topic is about the Multi RS only, because the whole software is different compared to MP2, for instance the Multi RS only communicates via VE CAN and Victron connect, not VE Bus and VE Configure. The entire ESS settings are completely different on Multi RS and the firmware for the Multi RS is has only just supports DESS. So in this case, if you have exactly the same problem on your multiplus 2, open a new topic because the solution for the Multi RS will most likely not solve your problem and vice versa.
I had 3x Multiplus 5000 running before I switched to the Multi RS, and the problem did not appear on my MP2. Victron staff already pointed out they have found the issue about the 5kW max feed in on the Multi RS and they are working on it at the moment.
Hi Dognose, i have the same issue as AukedeGr, my system with 3 Multi RS Solar 48/6000 stops also supplying energy to the grid when there is full sun, the battery is full and positive energy prices. When disabling DESS, the system proceeds supplying energy to the grid.
Thanks, Danny
We are currently investigating this issue, it only seems to affect the MultiRS when running with DESS.
What @towatai described with the unavailable DVCC settings for MPs is more or less unrelated to the MultiRS, even if the symptoms may look the same.
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I got another update for you, apparantly the issue with zero grid feed in when battery is full, also applies to my SmartSolar MPPT 450/200:
My SolarEdge PV system is still feeding back into the grid, but the SmartSolar 450/200 stopped charging my batteries (because 100%) but excess PV power is not fed into grid:
PS: I am running 3x Multi RS6000 with a separate SmartSolar 450/200