Multiplus 2 48/3000 unexplainable low battery alarm

Question

question

josh-sipma asked Mar 6, '23

Multiplus 2 48/3000 unexplainable low battery alarm

Really confused by this issue. I have 52.7 V at the multiplus positive and negative terminals. 52.75 V at the battery terminals. System is using two 24 V 200ah victron batteries, controlled by a lynx smart BMS.

The inverter will not even power on, because it instantly gives a low battery error when turned on. When the inverter is turned off via the switch, the system functions perfectly and as expected. VE bus Cable is connected to the VE bus port on a Cerbo. Lynx Smart BMS CAN bus is connected to Cerbo’s CAN bus.

Can’t figure this one out! Any ideas?

Multiplus-II low battery warning 48v battery

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shaneyake commented · Mar 06, 2023 at 11:17 AM

What do you mean by "When the inverter is turned off via the switch, the system functions perfectly and as expected"? Can you turn it on using inverter switch?

How are you trying to turn on the inverter? Do you have an isolation switch? If so how are your pre-charging the inverter?

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josh-sipma shaneyake commented · Mar 06, 2023 at 04:54 PM

When I turn the inverter off via the switch on the bottom, the system works as expected. Using the inverter switch (on the bottom of the unit) is when it goes into low battery mode and won’t turn on.

I’m just turning it on via the physical switch on the bottom. The Lynx BMS has a precharging circuit (AFAIK) and shouldn’t be the issue

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olegv answered · Mar 07, 2023 at 07:45 AM

Which settings? 2 * Dyness A48100

1678175039635.png (46.7 KiB)

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ponzoa commented · Mar 07, 2023 at 07:50 AM

Check the battery configurations on the spec sheet of the battery.

More importantly, if you have an ESS setup, check in the ESS Assistant the Dynamic Cut Off settings, your issue is likely to be there.

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olegv ponzoa commented · Mar 07, 2023 at 09:08 AM

No ESS

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ponzoa olegv commented · Mar 07, 2023 at 11:51 AM

OK, what about the settings in the INVERTER tab. Especially "DC input low shut-down"

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olegv ponzoa commented · Mar 07, 2023 at 03:39 PM

Got it, thanks

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Modifications Space

Node Red Space

Answer 1 · 2023-03-06T09:03:59Z

olegv answered · Mar 06, 2023 at 09:03 AM

+1, the same problem, but 48/5000

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Answer 2 · 2023-03-06T17:00:40Z

Laurens D answered · Mar 06, 2023 at 05:00 PM

Can you post your settings, that might give people an understanding what you did.

To me it seems that the BMS is configured (incorrectly) with a high voltage for alarm, so it'll report the current state.

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Answer 3 · 2023-03-07T08:17:04Z

myvicrocks answered · Mar 07, 2023 at 08:17 AM

Low Battery has been the bain of my life for the last 5 months - have a look at the list I created here to check for this type of issue - VE.Bus System [276] Low battery: Alarm - drive me crazy - Victron Community (victronenergy.com)

Might help might not but there is a lot of info on things to check on there. I feel your pain I have the same with the inverters just shutting down.

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josh-sipma commented · Mar 08, 2023 at 06:14 AM

Thanks for sharing this! Have you found a solution? I read through the thread. Looks like no great news. I have no ESS system set up—so it couldnt be that.

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Answer 4 · 2023-03-07T09:09:56Z

olegv answered · Mar 07, 2023 at 09:09 AM

Lot of customers with the same/similar problem :(

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Answer 5 · 2023-03-07T12:58:04Z

philipp-klaehn answered · Mar 07, 2023 at 12:58 PM

Hey Guys,

I have the same issue since a few days. (End of February).

My Victron ESS System with a Pylontech Force battery pack is active since 1,5 years.

I changed nothing and from one day to another a got several alarms per day.

unbenannt.png (97.4 KiB)

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myvicrocks commented · Mar 07, 2023 at 01:14 PM

You getting just alarms or is the system shutting down?

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olegv myvicrocks commented · Mar 07, 2023 at 01:33 PM

For me - unexpected shutdown

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olegv commented · Mar 07, 2023 at 01:44 PM

To be honest, it's not too often for me as on bitmap. My system (3*MP2 48/5000+2*Dyness A48100) lives about a month only, and I got probably 4 cases. Not fatal, but no explanation. Maybe combination of in/out power/SOC/etc, who knows, no idea how to track. The lowest SOC ever - 76%, too far from real "low battery"

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Meine_Energiewende olegv commented · Mar 10, 2023 at 08:23 AM

Hmmmm .... 2 x Dyness A48100 for a 3 phase MP2 5000 ? These packs are not able to deliver peaks above 75 Amps as far as i know. Every MP2 5000 needs up to 100 Amps (200 Amps peak). Maybe you have a electrical motor starting (fridge compressor etc) and that causes this warnings ? Dimensioning the battery packs the quite important.

Jens

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olegv Meine_Energiewende commented · Mar 10, 2023 at 02:14 PM

Agree that it's not enough, from the battery I can get not more than 75*2*48 = ~7kWt. But it's OK for my 1st priority devices. Initially I planed to have 1 MP2 8000, but waited 2 months without success :(. I'm from Ukraine, and it's critical to have power backup here. No technical problem to add additional battery, but money :)

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Answer 6 · 2023-03-07T14:00:39Z

philipp-klaehn answered · Mar 07, 2023 at 02:00 PM

The inverter (2 Multiplus 3000 in parallel) works all the time. Since the last two weeks I notice the SOC dips. I had a constante load true the night and no heavy peaks. What is bad with this, is that the Multiplus sometime starts to reload the battery pack and then consume a few what hours from the grid.

unbenannt.png (29.3 KiB)

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Alexandra ♦ commented · Mar 08, 2023 at 07:22 AM

@Philipp Klaehn

Do you have a battery with comms or is that a BMV?

Since that widget is what is most likely being reported by the battery itself, plugged in via comms, it seems the battery has an issue.

The posts above are related to the VE BUS monitoring, so related to the inverter itself. It can still be a battery related issue though, it depends on how the battery protects itself, it could be disconnecting its output terminals, is one theory.

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Answer 7 · 2023-03-09T15:14:03Z

olegv answered · Mar 09, 2023 at 03:14 PM

It seems, found source of my problem, but not reason :). It happens when connect Mk3 interface to the system (Cerbo GX), doesn't matter Victron Connect or VE Conf 3 running. After several minutes it says "Low battery voltage" and then "Device switched off"

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myvicrocks commented · Mar 10, 2023 at 08:15 AM

Wow you know what -- on 502 Firmware -- I found this over the last few days same thing:

1. Connect MK3 to do some changes - I take my time cause I read and make sure of everything -- all of a sudden Multi II just goes into Low Battery and reboots.

Now that I think of it the last few Low Batteries has been with MK3 connected. What is also interesting is a real Low battery error you hear the contactor in the inverter. This Low battery with the MK3 plugged in the contactor does not activate, but it does shut the inverters off and show Low Battery error.

@Guy Stewart (Victron Community Manager) - Maybe something the team should have a look at?

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olegv myvicrocks commented · Mar 11, 2023 at 09:34 AM

I got the following by email, but can't find this comment here

Alexandra mentioned you in a comment on Multiplus 2 48/3000 unexplainable low battery alarm on Questions & Answers:

@OlegV

When you connect the mk3, the gx is disconnected so the discharge and charge signal from the battery is disconnected.

The systen will shut off. This is a safety feature for systems with can connected battery and DVCC as the battery controls the system.

Plugging in the mk3 is the reason.

This happens on pylon systems as well

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olegv olegv commented · Mar 11, 2023 at 09:39 AM

It means that purchased Mk3 interface is (mostly) useless :(. Is it in my configuration only? Is it any workaround? I'm trying to setup generator, playing with options etc., but it just stops working.

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giorgos myvicrocks commented · Sep 20, 2023 at 09:40 PM

This has happened to me after upgrading the cerbo f/w to v3,10. The multi will switch off with low battery error although my battery SOC was 35%. after battling for 2 days looking for the problem I reverted back to f/w v3,01 and the problem went away. It was happening when my battery voltage was 51 volts so I suspect there is a problem/bug with the cerbo f/w 3,10

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olegv commented · Mar 11, 2023 at 09:46 AM

BTW, there is additional "feature" related to "the battery controls the system": https://community.victronenergy.com/comments/190930/view.html

At least, it looks strange for me. Unfortunately you start to know/understand all details/side effects only using the system in reality, not before purchasing.

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Answer 8 · 2023-09-26T14:12:55Z

olegv answered · Sep 26, 2023 at 02:12 PM

Now (fw 506) it's much better for me. After using Mk3 (~5min) still there is Low Battery alarm, but output is not disconnected, at least 5+ min.

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yann commented · Sep 26, 2023 at 02:33 PM

mk3 is not meant to stay connected to the inverter permanently, but used only the time needed to upgrade/setup.

If you want the inverter to work without turning off on low battery, first disconnect from your GX device/BMS then reboot. Then you can connect the mk3 and it will work based on the programmed shutdown voltages only.

When using mk3 is done, unplug it, replug the vebus from the GX, and the DVCC control will resume.

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olegv yann commented · Sep 26, 2023 at 06:42 PM

Yes, sure, not permanently. But when I'm playing (played that time) with generator, 5 min definitelly is not enough to change several params and see results.

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yann olegv commented · Sep 27, 2023 at 06:16 AM

Sure. So when you disconnect the GX device from VEbus, juste reboot the multi to disable BMS control.

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Answer 9 · 2023-10-23T10:19:02Z

gordonsetter answered · Oct 23, 2023 at 10:19 AM

I had the same low battery voltage issue when I first turned on my MP2/Pylontech system. With a high load (3kW) the inverter also switched off. I’m running ESS and realised that I had not set the dynamic cut off settings in the ESS Assistant to the 46V advised by Victron/Pylontec. I had mistakenly thought the problem lay with the DC voltage settings in the Inverter tab on VEConfigure which are ignored in ESS.

Too much reading but not enough learning!!

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