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Porcini avatar image

Using Multiplus SOC-low-shutdown with BMV SOC value

Hi all,

If I update my Multi to the newest firmware I could use the new feature "SOC-low-shutdown".
In past I used to take the BMV-relais for that, but now I am wondering if this would also be possible with a software solution.

In VEConfig I have to enable the battery monitor of the multi to use this feature. So the question now is:

Can I use the Multi's SOC-low-shutdown feature by using a venus device which overwrites the VE.Bus SOC with the one from a BMV (or BMS)?


Normally I would just try it, but there is no reason for an update if this won't work :)

Thank you!

MultiPlus Quattro Inverter ChargerBMV Battery MonitorSOCVEConfigure 3
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4 Answers
Porcini avatar image
Porcini answered ·

I tried it today. Here is the answer:

It works with the Multi's battery monitor as well as the BMV's/BMS value when "Synchronize VE.Bus SOC with battery" is enabled.


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StrataNet answered ·

Hi all,

My solution above I've tested and is working. The "shut-down on SOC" feature is what you're after. For the sake of testing, I set "SOC low shut-down" to 79% and "SOC low restart" to 80%. My 500W dummy load was turning off and on just as predicted (remember as mentioned above, the load is always on when grid AC is supplied into the MultiPlus).

I don't remember seeing this SOC setting on older firmware - so make sure everything is updated and you should be good to go.

I haven't yet tested this with a BMV-700, but I'm sure the same theory applies.

Cheers!

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Confirming that one of my devices on firmware v416 does NOT have the "shut-down on SOC" feature.

StrataNet avatar image
StrataNet answered ·

Hey guys,

Sorry to dig up an old thread, but I haven't been able to find an accurate answer for this, and the information above is a little confusing. As you can see in the below image, there is no option of "Synchronize VE.Bus SOC with battery" on my setup:

I've deployed a few of these now, and ran into issues a couple of weeks ago when I discovered that the inverter was not shutting off the load based on SoC.

In this lab setup (as above), I have a MultiPlus 48/800/9 connected via a Venus GX, to a PylonTech US3000. The MultiPlus firmware is v475 and the Venus firmware is v2.57; both the latest as of this post.


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Silly me. I just noticed the "shut-down on SOC" option below as I was proof reading this post! So the rest of this post may be pointless. OR it may help someone, which is why I'm still posting anyway. The rest of this post I'll leave as it is, based on what I was trying to find out. I'll test and report back on my findings.
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So can the inverter in the MultiPlus be triggered to shut off based on SoC, or does it have to rely on voltage? I haven't accurately setup the shutdown voltage on VE Configure in this bench setup, as there is not much point due to the little amount of voltage variation presented with Lithium batteries:


Any help in this matter would be kindly appreciated. I've got about 20-30 of these left to do, so would like to get it right!

@Mark, your post here was very helpful. Perhaps you may have some insight on this? https://community.victronenergy.com/questions/19480/soc-differences-between-devices.html

Cheers.


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So far setting the "shut-down on SOC" seems to work.

Note that from my discoveries so far, if there is grid power available, the AC output will be on regardless of the SoC setting (this is actually quite sensible).

Hi @StrataNet where’s the shutdown on soc supposed to appear in Venus os? Do you know the minimum firmware number? Thanks

Found the firmware info came in on version 451.


So I think I understand your saying there's an option to allow the bmv soc value to be sent to the VE.Bus?


At the moment I shutdown the Multi with a BMS assistant and the bmv relay. But it would be neat to do it on the ve.bus

Sorry I didn't see your extra post until afterwards; thanks for the info on the firmware version!

Yes that sounds like the same thing. When all working, your BMS (or BMV) should be able to control the inverter on/off status based on SoC, via the Venus GX. You are correct in that this is done via the VE.Bus.

I find that Victron stuff takes a bit of fiddling to get right (ok, a LOT of fiddling!), but once you get your head around it you can get a really clean solution that works well. So far we have 11 sites with GX devices deployed, and about another 100 to go over the next 3 years... It took a lot of investigating different vendors before settling on Victron!

Hi @Jwfrary,

Great question. To get the shutdown on SOC feature you need the VE Configure software. BUT you need to enable it on the Venus GX first - I found this thread very helpful: https://www.victronenergy.com/live/vrm_portal:remote-veconfigure
You need to enable "VRM two-way communication". With later firmware versions on the GX device, this is now located under the "VRM Online Portal" section of the Remote Console. Once enabled then you can download the MultiPlus (or other device) config file from the Device List on the GX device. It will appear down the bottom under "Remote VEConfigure". It's quite complicated to work out for the first time, but once it's enabled then it's easy.

In terms of minimum firmware version for MultiPlus, unfortunately I don't know. I have one here on v416 which does NOT have the shutdown on SOC feature. I also have another one on v469 which DOES have this feature. I haven't been able to find a changelog showing the firmware for MultiPlus.

Let me know if you get stuck and I'll be happy to help!

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Paul B avatar image
Paul B answered ·

I think you will find that this only works with the Internal multi/quattro battery monitor, not the external monitors ie BMV

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Are you sure? Venus writes the SOC to VE.bus I think.

That's correct!