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Impossible? How can I achieve my charging goal in a Camper Van?

Good Morning community.

Apparently my requirement is very exotic, at least I can't find a solution for it.

But first my equipment:

  • Campervan with DIY Lithium battery (Winston LiFeYPo4 cells), ECS-BMS, separate charging and discharging branch, each with Victron Battery-Protect for UVP on OVP protection
  • BMV-712 Smart as battery monitor with temperature sensor attached to the Battery
  • SmartSolar MPPT 100/20 Charger
  • Cerbo-GX connected to the BMV and MPPT via VE-Direct cable
  • DVCC function is active

So what is my goal? quite simple: charge the battery and then use available solar power for the current power consumption.

Unfortunately I can't get any further here. The charging process goes well with my settings up to about 90% SOC, but then the MPPT goes into the float phase and the battery is discharged again. Due to the property of lithium battery, the rebulk voltage will not be reached...

How can I configure the system so that the MPPT delivers the current power consumption and keeps the battery on the SOC until there is no longer enough solar energy available?
I hope someone can help, thanks in advance.

Christian

Christian Lindermann asked
Christian Lindermann commented ·

3 Answers

RS Inverter and DVCC

Does the RS Inverter 48/6000 support DVCC ?

pvittali asked
Alexandra commented ·

2 Answers

DVCC, Multiplus and MPPT

Hi

There have been similar posts but not really answered my concerns. I have 2 x MPPT, BMV712 and Originally IP43 charger, these were all connected using VE.Smart Networking.

I have 2 x MPPTs as I use one for the integral Solar Panels and the second allows me to add additional portable solar panels when static for a period of time (e.g. a show). Using VE.Start Networking it allows the MPPTs to synchronously charge batteries from both.

I have a GX device fitted now and my understanding is that you can't use both VE.Smart Networking and GX devices, which is fine in principal, why would you, also now have Multiplus installed.

My question really is, with the VE.Smart Networking disabled and the GX device set for DVCC, I have noticed on more than one occasion a disparity between devices, one MPPT showing on GX console as being in absorption, the other being in float or the Multiplus being in storage/bulk/absorption.

My assumption, incorrectly is that all these devices will be synchronised and charge stages managed by the GX device, they should all be in one or other stages but in unison, charge rates managed based on SOC, temperature etc by the GX device. Especially all devices are actively charging which can often be a scenario

thoughts please

Rgds


southsideph asked
JohnC commented ·

2 Answers

DVCC: "Max Charge Voltage" not considered when ESS in "keep batteries charged" mode?

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

andreas-0676 asked
andreas-0676 edited ·

2 Answers

Kein vernetzter Betrieb 100/50

Guten Tag


Ich habe dvcc aktiviert und mein Mppt regler per VE direkt Kabel am Cerbo angeschlossen. Nur wird er nicht erkannt und erscheint als stand alone. Woran kann das liegen?
Setup : multiplus 2000 12 v
Cerbo gx
Smart Mppt 100/50
Toch gx 50
Multi control
Victron 200 A smart battery
Smart BMS victron
Smart shunt 500A
Alle aktuellen Firmware Versionen, nur der multi hat noch 430.

[image]

razer05 asked
Stefanie answered ·

6 Answers

Looking for a definitive answer on 3rd party (non smart) LiFePO4 and DVCC

I have searched high and low on this forum to determine if I can use DVCC with 3rd party, non smart LiFePO4 batteries. The manual is vague in this regard and answers to similar questions here are often conflicting or inconclusive.

My batteries have their own built in BMS with no user programming functionality. I have a Cerbo GX and 2 x Multiplus 12/120/3000 inverter / chargers set up in split phase with a charge profile set appropriately.

If the answer is no, would you mind explaining what disqualifies this type of battery? I have it set up this way right now and everything seems fine but I'm concerned that I might be missing something.


Thanks in advance!


jefffay asked
jefffay commented ·

1 Answer

DVCC not compensating for inverter

DVCC is limiting charge current according to settings however it does not compensate for the consumption of a Smart Phoenix Inverter 24V 2000VA 230V. I've installed an 230V electric boiler and was hoping to get hot showers when the sun is abundant without overcharging the AGM batteries.

Firmware is up to date, how can I troubleshoot this DVCC related issue? Venus OS v2.66 is running on a Raspberry Pi.

[image]

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Both MPPT's are externally controlled according to the remote console and part of a VE.Smart network;

[image]

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DVCC settings;

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[image]


pruik asked
pruik answered ·

5 Answers

New batteries installed: GX Error #48 DVCC with incompatible firmware: Warning

Below is my current installation. As you can see I‘m stuck on firmware v413. Any ideas how I can remove the GX Error? What firmware version should I be running and how can I update to that version?


Easysolar:

MultiPlus 48/3000/35-50

Note - Firmware installed v413, latest v496, not updatable (1342)


BYD LV Flex Lite x 4

Note - BMU v1.22, BMS v1.13

mknoxc asked
mknoxc answered ·

2 Answers

CCGX - DVCC -> How to Limit Charge Voltage using ModBus-TCP

I've noticed the addition in DVCC the ability to limit the managed battery charge voltage to a value of my liking. I am very happy, that this is finally possible now.
Now, I would like to set this maximum charge voltage using Home Assistant.

Inside my Modbus TCP services, I have access to com.victronenergy.systems.
According to CCGX-Modbus-TCP Register-list.xlsx, the only writing-enabled registers com.victronenergy.systems are the CCGX-relay-states.

Is there any possibility set the Maximum Charge Voltage per Modbus TCP from Home Assistant? If yes, what is the register of this service?

Michael Timler asked
lsgv commented ·

2 Answers

DVCC shuts off BlueSolar when battery is fully charged

Hi,


I have following small installation:

1520Wp panel source

1x BlueSolar 150/35

1x Cerbo GX

1x Pylontech Battery

1x AEConversion INV500

The battery BMS is talking to the Cerbo via CAN. This forces DVCC on the Cerbo switched on. When the battery reaches 90% of its capacity the BMS is reducing the max current from the BlueSolar from 25A down to 10A. As I do have an inverter which is not seen by the Cerbo it's also unknown how much current the inverter is drawing. The inverter uses a maximum of 10A. So when I set the inverter to 100% in this condition no current reaches the Pylontech anymore. I understand usually (when the inverter is known to the Cerbo) DVCC is considering the current taken by the inverter.

To get a full charge I need to reduce the inverter power to somewhat lower than 100% so some current is left going into the battery.

When the battery is fully charged DVCC is turning off the BlueSolar completely. Although my inverter still would like to work.


I see actually only one way out of this dilemma --> disconnecting the BMS from the Cerbo and deactivate DVCC. If I then would connect the Pylontech to the Cerbo using a simple RS485 connection ... will I still get values from the battery visible in the VRM ?


Does somebody have any other suggestion ?


Thanks

pawl



pawlvandik asked
pawlvandik answered ·

4 Answers

Is there any reason to Multiplus II not charging Pylontech Batteries at maximum charge settings?

Configuration
2 paralel Multiplus II 5000/70
2 Pylontech UP5000 batteries
Can Bus Cerbo
DVCC
Update FW

Despite AC Input limit from Grid or Generator allow charging batteries at Max Charging Limit capability (CCL and DCL showed in VRM), real behaviour is that charging current never achieve Limit and keep below 10 to 25% below limit. DVCC Max Input AC and Maximum Charge Current are properly configured, but charging current doesnt achieve CCL and AC Input current keeps below configured limit.

Multiplus Charger is set to Adaptive+Batterysave, but I read that these settings should be ignored if DVCC is in control
Any comment on the issue?
Txs

mito asked
kevgermany answered ·

1 Answer

Ignore AC and DVCC

I have recently installed solar panels on my motoryacht. I am now looking for the most economical use of the solar panels, also in order to reduce the cost of shore power. The electrical system has mainly Victron components, except the panels and battery: Quattro 8000/200, Venus GX, MPPT 100/30, 720 Ah tubular plate batteries and 2 x LG Neon R 370 Wp panels, latest firmwares.

I have studied all the manuals and looked for answers on the community site. Although I see similar setups, I still do not have the ultimate answer on how to use the panels the most economical, either by using Ignore AC, DVCC, lower float voltage or a combination of these.

I fully understand how Ignore AC in VEConfigure works and have now set it up according to below screenshot:

[image]

I have been to the yacht today and have tested it with several loads. When using heavy load, the Quattro will deliver the power instead of drawing it from the battery, so it does not unnecessarily drain too much, which would take forever for the panels to charge back into the battery. There is a certain amount of equipment that draws about average 200 W, so in a day I will loose 4.8 kW. On sunny days the panels will charge with about 4.8-5.1 kW. So on cloudy days and near winter time the batteries will slowly deplete and when voltage reaches 23.5 V, the Quattro will kick in and charge (with max 100 A) up to when bulk is finished (85 % SOC). I might change that in wintertime to when absorption is finished, as the batteries need to be fully charged every once in a while. So far so good.

The manual of the MPPT states that the DVCC function will result in the MPPT being an active controller in the system. "For systems with lead batteries, DVCC offers features such as a
configurable system wide charge current limit, where the GX device actively limits the
inverter/charger in case the solar chargers are already charging at full power". I have tried the DVCC feature (without Ignore AC) with a setting of 100 A for max charging and shared voltage, current and temperature sense.
I have observed the behaviour of MPPT and Quattro for a long time and my impression is that the MPPT does not always do what it should. I can see the Quattro charging with high amps and the panels with relatively low. When I switch off the shore power, the panels immediately jump to a much higher charge, so the panels are under DVCC not used with maximum capacity. I would also expect that when batteries are full and loads are low, while panels can produce more than the load, that the Quattro might stop charging all together.

An expert advised to lower the float voltage of the Quattro with 1 V, After lowering that setting to 26.6 V, I saw this morning at around 08.00 hrs that the Quattro stopped charging. Not completely sure why?

I have gathered my thoughts and I think I have to options: 1) use Ignore AC and 2) use DVCC. With option 1, it will deplete the battery more and I think the panels are used most economical, but I need to make sure the batteries are getting a full charge every once in a while. With option 2, the batteries are kept a full charge (100 %)., but I have the impression the panels are not used to the max and the Quattro will only stop charging when the voltage of the batteries is higher than the 26.6 V. Which brings me to the question do I also need to lower the absorption voltage in order for the Quattro to stop charging when in absorption fase in order to get the max charge out of the panels? I find lowering these setting in contradiction to the DVCC manual: "Limit charge current. This is a user-configurable maximum charge current setting. It works across the whole system. MPPT Solar Chargers are automatically prioritized over the mains/generator".

By the way: I use the AC out 2 of the Quattro for heavy users, with the intention that when I loose shore power (while sailing [do you actually sail, drive or operate a motor yacht?]), it automatically switches of the heavy consumers and I will not unnecessarily deplete the batteries. With Ignore AC while still in the harbour, I loose the heavy consumers as the Quattro needs AC on either AC In 1 (generator) or AC In 2 (shore power). I probably have to rewire the heavy consumers to AC In 1.

My questions:

1) Why does the Quattro stop charging when lowering float voltage when panels are charging?

2) Do I need to lower the float voltage in order for the Quattro to stop charging while enabled DVCC?

3) Why is DVCC not using maximum available charge from the solar panels?

4) Do I also need to lower the absorption voltage while DVCC enabled so the Quattro stops charging in absorption fase to maximum use the charge of the panels

5) Can I, or should I, use DVCC in combination with Ignore AC?

Any comment, suggestions, answers are welcome.

I have also published about the installation of the electrical system and the solar panels on my weblog (in Dutch, but has Google translate button): www.xanthiona.com .

jurjenhoekstra asked
erichabg answered ·

2 Answers

Smart shut as DC meter for DVCC - correct placement

I'm wanting to use a Smart Shunt as a DC meter instead of a battery monitor. (My BMS is providing battery monitoring) My goal is to use the DVCC features of the Cerbo GX to be kind to my battery, however I want to increase the charge current when I have a high DC load attached (solar dump load into hot water tank)


My understanding is that if I configure the Smart shunt as a DC meter the DVCC will then factor in any DC loads and increase the current charge limit. (CCL) - For example, charge current set to 25A as requested by BMS, but there is a 25a DC load, CCL will be set to 50A)


I want to know if I need to reposition my shunt in my circuit for it to perform this function correctly.

I have a relatively simple setup in a campervan:

Lifepo4 battery > lynx distributer as a busbar > Smart Shunt on the negative between battery and lynx.

Solar MPPT, Orion Smart DC2DC, Multiplus II, & DC loads all connected to the lynx busbar.


My question!

Should I move the Shunt to only be on the DC load negative or is it ok for it to remain on the main battery negative?


Obviously the Cerbo can only see and control the multiplus and mppt sources, the Orion is not monitored / controlled. I cant work out what will the DVCC will do if there is input from both the Orion and the solar while battery is full and dump load is on. e.g. What will happen if I'm driving with a full battery and have the dump load on? Will the DVCC compensate and allow the solar to dump or will it reduce the current.


Hope this makes sense, appreciate anyones thoughts before I go rewiring things!


liam-tuvey asked
liam-tuvey answered ·

2 Answers

Smartsolar MPPT with Skylla I and DVCC Color Control GX Synced Charging

I have a Smartsolar 150/35 connected to a CCGX. I need to replace my 240v charger and thinking about the Skylla I 80a 24 Volt. I run 6x 150amp hour full river AGM in a 24 volt arrangement. Can the GX with DVCC sync the two charges?

Thanks

alex-1 asked
Stefanie answered ·

1 Answer

Pylontech UP5000 not charging to 100%

Good afternoon all,

This is the first time I am using the pylontech UP5000 batteries and I cant get them to charge above 86%, or more specifically 51.53V. The system is a Cerbo, a Quattro, and the pylontech batteries.

[image]

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This is not my first time setting up a Victron with the Pylontech batteries, and I thought it was pretty straightforward up until now.


I have been through https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

and all of my settings are exactly as they state here, with the exception of the DVCC.

It looks like the items on the Live page are outdated as the DVCC is now forced on. SVS is forced off, STS is forced off. (I have checked past installations and I see this is now true on all my installations)

In addition to the above the following settings are set:

Limit charge current: Off

Limit managed battery charge voltage: off

SCS : off.

[image]


I also have confirmed the battery and the Cerbo are communicating with the parameters coming through as expected. The BMS CAN is set up correctly and I have no errors.

[image]

Additionally, I see that the cell data is now available. I don't know if this is just a Cerbo thing or a UP5000 thing. But I think it's cool.

[image]

History:

When I first charged the battery it charged to 100%, which was at 51.53V. Over time that 100% has dropped to 86%.

What I suspect is that overtime the cells have balanced, which causes the 51.53V to equal a lower SOC. This is just my opinion and could be incorrect.

I dont know if anyone has any ideas on what I can do differently, or if I am missing anything. as at this point, I don't know how to get it to charge to 100%.

ewalderasmus asked
nickdb commented ·

4 Answers

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