Max charge current is set depending on a variety of factors using NodeRed, and has been working flawlessly for months. I recently noticed that it stopped fluctuating as expected, and checked the code to see if it was still set correctly, as well as whether or not it made it into the "remote console" (in DVCC -> "Maximum charge current"). I also checked that there was no interference from the BMS, and that the current voltage wasn't close to any of the limits either.

When disabling the NodeRed code and setting the charge current manually in remote console, this didn't have an effect either.

Ultimately, since I couldn't make sense of the situation and none of the data I reviewed gave any explanation, I decided to restart the VE.Bus system which - as expected - returned things to normal.

The MPs are running firmware 498, I checked the changelog and it doesn't seem that there have been any changes pointing to what I'm describing above (except maybe for "miscellaneous changes"). Is anyone aware of a firmware change that would fix the issue I have described?
Thanks!

Hello,

i was watching a video from Andy's off-grid garage about the dvcc charge current limit. In his video the DC load affect the total charge limit cause is not monitored and he said that if you put a SmartShunt the dc load get taken in account and not just calculated.

So i was thinking... it will work also to monitor other no Victron mppt chargers? Let me explain.

I have an oversized system for winter, so in summer there is too much energy and i have to limit the chargers. At the mooment i have 3 Victron Mppt but also 2 Epever (yeah, good ones but not smart).

Their dc power is just calculated by the Smartshunt and not taken in account. But if i add a SmartShunt to monitor the Epevers? I know i can't change their settings but their current will be monitored and Venus can change the SmartSolar settings. I know the best thing is to change the chargers but i will do it in the future or when the Epever fails.

Another use for the SmartShunt can be to monitor the charge from an hybrid inveter? In the next days a Multiplus-II 48V 5000Va will pair with an hybrid one i already have. My idea is to connect the hybrid as AC1-IN and share the same battery. The hybrid is connected to a string of 10 400W panel and honestly i can't afford to buy a MULTI RS 450 chargernow, so i will keep the present one mostly as charger and to assist the Multi for the big loads.

If my idea works, i need just one additional Smartshunt for the hybrid and Epevers or i need two?

This whole setting is just an idea in my mind, i'm still confused.

Thanks in advance for all the help and suggestion.

My first post. A newbie to Victron Systems. Installation is in a professional campervan conversion that is less than one year old. Built for boon-docking for several days at at time.

Renogy PV panels - 600 watts total
Pylontech LiFePo4 100aH batteries x 4
Victron Cerbo GX firmware - v2.89
Victron Orion Smart 12V/12V-30A firmware v1.13
Victron SmartSolar MPPT 100/50 firmware v1.61
Victron MultiPlus 12V 3000 120-50 120V firmware ?
DVCC screens below

AC loads are 1800W induction cooktop, 450W milk frother, chargers for laptop/tablet/portable
speaker.

High Voltage Alerts (HVAs) frequent after batteries reinstalled from wither storage. Assuming that was the batteries balancing themselves? See HVAs again because of small AC drain and high solar input. (3 days off grid and batteries did not drop below 86%).

So... questions
1. Will I be always chasing HVAs because DC-DC charging + PV charging capabilities
may often outstrip AC loads?

2. Will continuing HVAs cause battery damage over the long haul?

3. Are their setting changes that will dump/divert excess charge?

4. Any other basics here that I am missing?

Any guidance greatly appreciated.

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Being new to this forum, I did not find an answer to my question / issue and hope somebody can help me.

TL;DR; What can I do to prevent a MP2 to discharge a fully charged battery when I lower the DVCC Maximum Charge Voltage?

I am having a pretty standard ESS setup with 1 MP2 and a Seplos Lifepo4 battery.

As I understood that DVCC doesn’t work perfectly with the Seplos BMS as the smart BMS (meaning the system always charges to DVCC Maximum Charge Voltage, but unfortunately never drops to a float voltage to ease battery degration).

So I worked a bit with NodeRed and have a pretty good looking setup, which automatically lowers the max charge voltage when the system reaches the bulk voltage. As described, immediately after lowering the max charge voltage, my MP2 discharges the battery till it reaches the new voltage instead of just lowering the voltage and let the LIFEPO4 batteries lower the cell voltage on its own.

Can anyone help me tweaking it so the MP2 doesn’t discharge my battery?

Many thanks in advance!

Dear forum,

I am new to this forum and hopefully somebody has a hint for me.

I am running a 40kWh battery (16s) connected to a MP2 GX. As long as the MP2 ist the battery-monitor everything works fine. Actually the SOC differs to the SOC the BMS is showing. This is annoying, as in the meantime it differs to 25%. As soon as i use the BMS as monitor DVCC is forced on and the SOC is correct, but no charging happens. Discharging still works fine. As nearly all BMSs this one claims to be "pylontech" but delivers resonable CVL 56.0V. What can i do to make the MP2 load my battery? In the near future I want to add a MPPT so DVCC seems to be mandatory...

Thanks a lot for any idea or help

Stefan

Does anyone know how to detect Victron bms v2 in dvcc?

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My ve.bus paths I’ve tried are;

MP->MD->BMSv2->GX->DMC

MP->MD->BMSv2->GX

All firmware meets or exceeds minimum requirements.

Dear all,

I'm using ESS on a Multiplus 2. I've gone already to related posts in:

https://community.victronenergy.com/questions/11225/dvcc-and-pylontech-battery.html
https://community.victronenergy.com/questions/16064/battery-monitor512-alarm-high-voltage-alarms-victr.html
and I've configured the system according to: https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

My Problem:

When I operate ESS in "keep batteries charged" mode, I get "High DC ripple" Alarms and "High Voltage" Alarms leading to shut down the Multiplus at high solar yields (as already described in other posts), even though I've set the "Max Charge Voltage" in DVCC to 51,7 or even less.
Observing the local terminal, I can see charging current although the battery voltage is above 51,7.

When I operate ESS in "Optimized with Battery life" mode, I don’t get Alarms nor shut downs. At the local terminal I can see even discharge currents in case the battery voltage exceeded the limit set in DVCC (after changing from "keep batteries charged" to "Optimized with Battery life" mode).

From what I've seen it appears to me DVCC limits are being not obeyed when operating ESS in "keep batteries charged" mode?

Anyone having similar problems respectively is there any solution to stable- and reliably run ESS in "keep batteries charged" mode ?

BR Andreas

My HW configuration is:

• Multiplus-II 48/3000/35-32
• Venus GX Firmware: v2.73
• 4 x Pylontech US2000C Firmware: v2.7
• SMA SunnyBoy on AC-Out 1

Can more than one Lynx BMS be connected to the same Cerbo GX? I understand only one would be used for the system view pages, but does it support multiple listed in the device list as it does BMVs or Smart Shunts?

I have several MPPTs connected to a Rasp Venus and DVCC switched on.
One DVCC I don't want to be controlled by the DVCC, but I want to see the values in Node-Red (so must be connected via VE.Direct).
Can I somehow exclude this MPTT from DVCC control?

Hello. 

I installed a new Mulitplus 2 48/5000. DVCC limit charge current does not work. With the old Quattro, DVCC worked without any problems. Did I make a mistake somewhere? 

System setup: 
ESS with Cerbo 
MPPT chargers show "external control".
 
greeting 
Paul

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I have a system consisting of a CCGX, SmartSolar MPPT 150/35, Multiplus II and a SmartShunt 500A. All the devices are connected via VE.Direct or VE.Bus.

I have 1800W of PV, and a 48V lead acid battery bank running in an off-grid cabin. The MPPT is set up with the correct charge voltages in accordance with the batteries' datasheet.

During the sunny part of the year I have usually let the MP run 24/7 to run a fridge as well as the broadband router, which adds a small load to the system. After doing this the batteries started to degrade rapidly.

I think the culprit may be that the MPPT controller cannot really know if this extra current is going directly into loads, or if it is the batteries accepting more current. Therefore it may not know when to switch from absorption to float voltage.

Up until now I have been using the system without DVCC. I am wonder if DVCC can be used to improve the lifetime of the batteries by letting the SmartShunt read the current going into the batteries rather than the MPPT controller itself. That way the system can distinguish a charge current from direct use and better determine the charge phase of the batteries.

Does anyone have any experience with this?

Hi, I'm looking for some advice.

The following system is managed by the Pylontech BMS.

48V 3000W MultiplusII, Smartsolar 150/35, Cerbo GX, 2 x Pylontech US3000C.

I can confirm DVCC is turned ON.

I was told I should manually set the pylontech recommended parameters in the multi and charge controller in the event they lose communication with the Cerbo. Do I turn OFF DVCC, set the parameters and then turn it ON for the BMS to takeover?

I've upgraded to the new BMS v2.
I upgraded from the old BMS v1 because I want to utilize DVCC.

However when I enter the DVCC settings on my Venus GX, my choices for the controlling BMS are still automatic selection or no BMS control.
I was expecting to see the new V2 BMS popup as an option.

My question is 'What is the expected behavior for this setting with the new BMS v2?'

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I've reset the ve.bus and redetected the ve.bus with no effect.

Victron Connect shows me that the Multiplus charging is being controlled by a BMS.
So there is some communication happening.

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I have Victron smart lithium batteries (v1.31).

I have a multiplus 12/3000/120 (v502), remote panel, bms V2 (v113) and a Venus GX (v3.00~29) connected to the ve.bus.

I've updated the firmware on all of those devices.

I also have x4 MPPT smart controllers connected to the venus GX via ve.can (v3.13). Those firmware were also updated. I was also expecting their networking operation to be BMS controlled, but they still say standalone, bms controlled = no.

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I'm just wondering if anyone else is doing this and what could I expect the behaviour to be?

Or, am I missing something?

My System:

ESS with:
3x Multiplus II 48/5000
2x MPPT 250/100
1x Fronius Symo 15 on AC out
8x Pylontech US3000
Cerbo GX

I have a problem with the DVCC feature "limit charge current". I have set the max charge current in DVCC to 60A.
If i enable grid feed-in (AC & DC) the system ignors the max charge current and charges up to the max current of the pylontech battery 296A.
With grid feed-in disabled everything works as expected, the system limits the charge current to 60A.

Is this normal? Am i missing something?

bonjours une question pour M cortassa , quand je désactive le dvcc il y a une valeur qui viens de nul part 58.80v dans fonctionnement en resseau impossible de modifier et pourtant ni le bms ni multi ou mppt a cette valeur ? qui a une reponse a ma question merci

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