v0.9.1

[Louisvdw]

• Fixes to better handle driver exit for VenusOS V2.80
• Python 3 fixes for Sinowealth BMS
• Daly owners can invert their current flow indicator with INVERT_CURRENT_MEASUREMENT flag.
• Populates Consumed Amp Hours
• Show when bank is offline after 10 failed replies

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This discussion was created from the release v0.9.1.

[nhybrow]

Hi,
How to use INVERT_CURRENT_MEASUREMENT flag ?
I put it in the utils.py file, with = -1 argument, but doesn't work
thanks in advance

[Louisvdw]

Just to confirm you are using a normal Daly BMS. Not a Sinowealth chip version?

[nhybrow]

I dont find Sinowealth anywhere in the venus information of my DalyBMS. I think so it's not a Sinowealth.
https://photos.app.goo.gl/N8p9DRx7CSG8pbQN8

[Louisvdw]

That is the normal Daly, so it should work. Let me have a look

[mendok]

Hello and merry Xmas.
Just wondering if and when a new version to include cerbo gx fix??
As i am having basic problems logging into my cerbo gx.
Keeps saying access denied
Cheers mendo

[Louisvdw]

The problem with the Cerbo GX where it does not run the autoinstaller is an issue with the device and the VenusOS software. This will be something the Victron team will be looking into. The driver just use that Victron service as an install option. Until this is fixed in a new firmware you will have to use one of the other install methods.

[Martin1683]

Hallo Louis,

wundervolles Projekt vielen lieben Dank dafür. Eine Spende ist unterwegs. Eine Frage hätte ich aber: Immer wieder lese ich, dass es manchmal Probleme gibt, wenn zwei USB-Treiber aktiv sind, z.B. ein Gridmeter von Carlo Gavazzi

Ich habe einen Cerbo GX. Wie kann ich den Treiber eigentlich wieder entfernen, falls es Probleme geben sollte? Oder ist der Treiber nur aktiv, wenn auch ein USB - RS232/485 Kabel angeschlossen ist? Hilft es bei Probleme auf Werkseinstellung zurückzusetzen?

Vielen Dank für deine Info.

MFG Martin

[Louisvdw]

Hi Martin

You are welcome to share information about the driver. I love to hear from people that find it useful and see their system that they use it in.

About balancers. Balancers are great to have for lithium batteries. They make sure that one cell does not get to far out of sync with the rest of the battery. And you will find that all BMS have them. It is part of what makes your battery last much longer by keeping your cells where they should be.

The size of the balancers and active vs. passive balancers is where peoples preverences differ. With that it is all about what you need and how much you are willing to spend.

In theory when your battery's cells are all matched up and balanced they should stay that way.
However no 2 cells are exactly the same. They have some manufacturing tolerances that make them all unique. It is these differences that make one cell deplete faster or another charged faster.
If you get matched cells for your battery, meaning they have very close to the same charactiristics, and you start with them on all the same charge levels then you only need small balancers to keep them the same.
If you start using your battery before the cells have the same charge, then your balancers have to work so much harder to get all the cells the same and this can take a week or two. Then larger balancers can do this faster. But after the cells are all the same you again only need very small balancers and a large one is a waste.

Active balancers will move the energy from the high cells to the low cells, while pasive balancers will use a load to reduce the voltage on e the high cells until the low cells can catch up.
Passive use less complex design which is cheaper to make, while active will save you energy, but cost more.

Would I add active balancers on top of my BMS? Propably not.
But if I do have active balancers I would add it to the battery when it is build to reduce the time balance them and remove them afterwards.

I have seen quite a few instances when the BMS did not correctly keep the battery balanced. In such a case I can see that an external balancer will be better. But this is a case of fixing a problem for spesific hardware and would not be a generic advice.
The Daly BMS and Tian Power have issues with some of their balance logic in some models. It is less of an issue if the BMS is connected to the driver as the charge system and the BMS can now work together.

[Martin1683]

Hallo Louis,

was mir aufgefallen ist: Das CCCM sollte eigentlich bei SOC >98% auf 1A Ladestrom begrenzen. Im Rahmen des ESS wenn der Multiplus die Batterien auflädt, wird nichts begrenzt. Wie kann das sein

.

[Louisvdw]

The CCCM formulas had been updated in a earlier release to allow more (5A in the 99-100% range), but the documentation was outdated. I fixed the wiki with the new CCCM limits.
The other problem you will see is that the multi will struggle keeping the limits exact in the lower current. That is just cause it is less acurate with low current than with high current. But is should close the correct range.

[Martin1683]

Hallo Louis,

jetzt muss ich dich noch was fragen, da ich mir das nicht erklären kann. Im Multiplus habe 1 Stunde Absorptionszeit eingestellt. Der MPPT folgt ihm gemäß ESS Handbuch. Nur bleibt es nicht bei einer Stunde Absortionsspannung. Er geht nicht in Float über.

Wird das über deinen Treiber gesteuert?

MFG Martin

[Louisvdw]

For the driver you activate DVCC which means the battery now is in control, so your float and absorbtion settings will be ignored.
It is a good thing as those are used for lead acid batteries so not needed anymore.
You can go read the DVCC section on the Victron website. It has a much more detailed explanation