Unanswered Questions in DVCC

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.

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?'

[image]

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.

[image]

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.

[image]

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

Or, am I missing something?

Greetings,

Any ideas or assistance will be appreciated.

I'd like to integrate a Sterling Power BB124870 (12 to 48v 70A DC DC / Battery to Battery Charger) into Cerbo GX (DVCC) controlled off-grid system. Currently the system plays together nicely; 52v 100Ah Blue Nova Lithium Battery (built in BMS with CAN comms), 5kVA MultiPlus II, SmartSolar 100|20, Cerbo GX & GX LTE 4G. This is built into the back of a pickup or 'bakkie' as they are affectionately known in South Africa. If Victron had a 12-48v DC DC charger I wouldn't have thought twice and would have gone the Victron route. Sterling Power's product is not ideal but there wasn't really much choice in the matter.

The DC DC charger will be installed as a voltage based element of the system much like an Orion Tr Smart. Naturally parameters will be configured to match battery requirements as far as is possible. The unit is triggered by voltage exceeding a preset on the incoming line or ignition signal just like an Orion Tr Smart. In addition it has two BMS inputs (for a 0V or 2-17V trip signal to trip charging). Ideally one or the other should be used based on nature of signal from BMS.

Considering that the BMS is built into the battery in this case, is it possible to tap that trip signal from the Cerbo or Battery?

If not any creative ideas on controlling this device other than just connecting as a voltage based charger?

Considerations:

- Voltage of Bulk/Absorption/Float can not be matched exactly based on available increments so I intend to configure to charge at closest increment below specified voltages.

- I intend to zero out Conditioning / Absorption / Float stages as far as possible and only use for bulk charging. MultiPlus / SmartSolar can take care of charging to / maintaining 100% SOC. I'm concerned that the unit may trip the battery if its program veers from what the battery is asking for. Resetting the battery is a a bit of an effort access wise.

Thank you!

Is Victron working on a solution for the not working CCL setting in DVCC with DC-feed on?

I use seral driver with JK-BMS but with DC feed on, it is impossible to reduce the current load to battery. The driver settings are completely ignored and the solar charger power goes to battery till the BMS disconnects it.
I would like te reduce the battery charging-current to lower values in general and also would like to use SOC based limits.

I am happy with victron but this behavoir and the fact, that every reboot of my venus raspi makes doubled devices are really awful. The issues are alreday well known, many users have the same problems.

I created a node red based workaround to reduce the battery current (setting grid target value based on watt calculation) it works in general but in case of grid disconnection I will again run into problems.

Would be really great if a solution could be implemented!

Stefan

Bonjour à tous,

J'ai mis en service une installation hier et le SmartShunt ne fonctionne pas bien.

Cerbo/MPII 5kVA/2x MPPT 150/60/SmartShunt/Batterie LFP avec BMS non communicant.

Il n'y a encore rien de connecté en AC-IN et AC-OUT du MPII.

Le shunt ne mesure pas l'autoconsommation de l'installation (MPPTs/MPII/Cerbo), il reste fixe à 0A :

[image]

Il a pourtant bien vu la charge des MPPT aujourd'hui :

[image]

Comme s'il ne savait compter que dans un sens...

Tous les éléments sont à jour. Configuré avec ESS et DVCC. J'ai remis la configuration d'usine et reconfiguré le shunt mais rien à faire.

J'en viens à me demander si c'est pas un problème hardware. Une idée ?

Merci !

Hola

This system, 3 parallel MultiPlus-II 48/5000 with 2 BYD BBox LV 14kWh and 2x 250/100 MPPTs.
Its recharging during night time via generator control (No ESS or such).
Now the batteries shut down short after fully charge 100% SOC.
It looks the BYD commanded CCL 0A, but MP-II is still charging with 25 Amp.
Battery shut down after a while.

[image]

DVCC is active, no shared sensors are active like victron battery compatibility doc recommend.

[image]

Any ideas / thoughts?

Thanks a lot. Saludos

Dear,

according to Victron GX documentation with DVCC on, there should be given priority to the solar chargers. This is not working correctly in this setup:

GX 2.91; 3 phase Multiplus 5000 v.482, Smartshunt v.408, 3xSmartsolars v.159

DVCC is ON with Charge Current limited to 222A, all "senses" are shared and VE.Bus temp sensor chosen.

While the generator is ON and the battery not fully charged (bulk and beginning of absorption) the generator helps out on a high load on one phase. The other two phases charge the battery. This is not the expected behaviour as solar is available, the solar chargers are limited down to zero contribution. But according to the description solar should have charging priority.

Is there a solution, something we are missing out?

Hi,

I got my cerbo gx killed when I connected it to 48V.

https://community.victronenergy.com/questions/152325/cerbo-gx-geht-standig-kaputt.html

As a fast solution I installed a RPI4 with venusos.

Everything works fine but the system ignores DVCC and ESS, the same worked fine with the Cerbo GX.

Any help would be very nice :)

v2.91~1

I am looking for some details and/or confirmation about the IP43 charger 120-240V model.

===========================================

When looking here,

https://www.victronenergy.com/media/pg/VE.Smart_Networking/en/ve-smart-networking-product-compatibility.html

it is specified that ONLY the 120-240V model supports both

• the data sense sharing (V and T) capability
• the charge synchronization capability

The 230V model only supports the first one.

Q1: Is the information found in the documentation accurate and up to date?

============================================

When I am looking to the change log of the IP43 firmware,

https://professional.victronenergy.com/downloads/firmware/file-download/?name=Phoenix%20Smart%20IP43%20Charger/Phoenix%20Smart%20IP43%20Charger%20firmware%20changelog.docx

the latest entry is about FW version 3.38. However, it looks like the 120-240V is only using FW 3.50.

Q2.1: Is it possible to update the change log document to know exactly what we have in FW version 3.50?

Q2.2: Is version 3.50 the initial release version for the 120-240 model?

============================================

Sometime ago, I posted few question regarding the IP22 rev2 and the synchronized sharing capability.

https://community.victronenergy.com/questions/99702/ip22-rev2-mppt-syncronized-charging-how-the-storag.html?childToView=100422#answer-100422

Basically, I will ask the same questions but for the IP43 (120-240V model only)

Q3.1: Does the IP43 120-240V model will always become the charge master if combined with MPPTs in a VE.Smart network?

============================================

DVCC vs VE.Smart network

In the VE.Smart network documentation,

https://www.victronenergy.com/media/pg/VE.Smart_Networking/en/limitations.html

it is said that DVCC voltage sense takes over voltage sense coming from VE.Smart network.

Let's suppose you have a system with an IP43 120-240V model and 1-2 MPPTs (being both VE.Direct and VE.Smart capable)

Q4.1: What about the "Synchronized charging" capability of the VE.Smart network when DVCC is enabled on the GX? Is it deactivated or still in function?

Q4.2: If it is still in function, does the current limit capability of the DVCC be used by MPPTs?

============================================

It is said here DVCC is not yet supported by the IP43 charger.

https://community.victronenergy.com/questions/144664/bms-ccgx-phoenix-smart-ip43-charger-the-dvcc-wont.html

Knowing the 120-240V model is using a newer FW (3.50)

Q5.1: Is it true for 120-240V mode? (.i.e DVCC not supported)

Q5.2: What is not supported exactly? Everything (voltage sense and current limit capability)? Or just the current limit capability?

============================================

Thanks!

-François

Our customers like to use the SmartSolar relay to trigger an external contactor with an immersion element when the (CANbus Pylontech) batteries are fully charged. Triggering the relay on Float/Storage state seems to be the best approach, though we've discovered the relay does not seem to trigger when the batteries are full when the SmartSolar is operating under "External Control" from the Cerbo GX with DVCC enabled. If DVCC is disabled, then this seems to work as desired. On the Victron Connect main page for the SmartSolar, it'll only display Bulk/Absorption/Float state when DVCC is disabled; otherwise it only says "External Control".

I was wondering if others have experienced this, or if Victron staff can confirm this is the correct operation and whether there is no way to use the Float trigger relay option when using DVCC and CANbus batteries. Thanks

Good day!

Looking at https://www.victronenergy.com/media/pg/CCGX/en/dvcc---distributed-voltage-and-current-control.html#UUID-34a4601f-5b47-faa7-9b06-dc557696f5fc

Point 8.4.1 - sub-point "3"

"DC Loads are not accounted for. Even when a BMV or other battery monitor is installed. For example, with a configured maximum charge current of 50 Amps, and DC Loads drawing 20 Amps, the battery will be charged with 30 Amps. Not with the full allowed 50 Amps."

When or how can we change this? I cannot see why the DVCC cannot increase the current from chargers to compensate the loads and keep charging current at for example 50A.

Offcourse the idea works flawlessly in ESS configuration, but we do not have any inverter in the setup - but we do have high DC loads.

Any input or ideas will greatly be appreciated!

Regards

Hello All,

I have a Cerbo GX connected via VE.Can to a SmartSolar MPPT 150/70 VE.Can and a Lynx Shunt 1000 VE.Can. I have DVCC enabled as well as SCS, SVS, and STS. I have found that the MPPT changes charging states correctly according to the readings from the shunt. However, it is not compensating voltage according to the temperature reading from the shunt. The MPPT seems to be compensating from the initial ambient temperature as the standalone strategy. The MPPT has v3.05 firmware and the shunt has v1.08. Any help would be appreciated.

I stumbled upon the Buck-Boost DC-DC Converter and thought it would be great for my hybrid RV setup (12V OE alternator and battery, 24V auxiliary alternator and house LFP bank). But then I was very surprised to learn that it is not integrated into the beautiful Victron CAN ecosystem and thus cannot participate in DVCC.

In my dreams, I would have this device work bidirectionally: use up to 40A of current from the OE system to charge the 24V LFP bank and keep the OE 12V system topped up from the 24V bank when the engine is not running. Both being controlled by the REC Q BMS.

Is there any way to achieve even a portion of this?

Thanks,

A.

In an installation with a CCGX and multiple SmartSolar MPPTs each MPPT with the same spec array and exposed to the same incoming solar what will determine the power produced by each MPPT?

Is it just down to small differences in physical installation? e.g. cabling or variation in actual panel output. Or is there something happening within the DVCC algorithm to control power output in each MPPT?

Hi,

My question: Is there a way to manually equalize or automate equalizing while using DVCC?

My problem: When DVCC is on it seems impossible to trigger equalizing. I have tried via the GX console or directly on the charger via VictronConnect. Without luck. When I switch off DVCC I can trigger equalizing with VictronConnect over Bluetooth on the charger.

My setup:

Island setup. No connection to the grid.

- Battery: 24 V, 900ah lead acid

- Panels: 18 275W. Configured as 2 arrays (east, west). Each connected to a charge controller

- Inverter: Multiplus 24/5000/120-100

- Charge controller: 2x SmartSolar Charger MPPT 150/70. Connected vi VE.Direct

- Venus GX

DVCC settings:

- DVCC on

- Limit charge current 100A

- SVS on

- STS on

Regards,

Daniel