Victron charge settings

Haze said:

I can get the cell info in the morning, I’m in a hotel till tmrw.

This is all the info I can see from here and honestly I’m not sure what VRM is.

I blacked out the serial numbers not sure if that matters.

Click to expand...

Your Cerbo firmware is newer than mine, so they may have made some changes to the Pylontech drivers.

VRM is Victron Remote Monitoring, i.e., the system that hosts the website from which you're supplying this information.




This is a VIEW ONLY sharing option that shows a slightly delayed interface with no ability to change any settings.

Here's mine in my signature:

Ok I don’t want to leave you hanging I have to run out on a call, I will get this info posted up first thing in the morning.

Thanks again for all your help. I truly owe you.

I'm guessing you haven't done any customization, so I'll give you some suggestions since I won't be able to make the changes myself:

Advanced and then widgets:



Select the 512 battery monitor (should be the BMS), open with the "+" and then click all options:



Then hit the widgets selector again to make the changes.

This should show all battery data available with data logged every 15 minutes.

Ok so my son figured out the issue with the low battery light coming on when you remove the data cable from the batteries to the Cerbo. So if you just un plug it like Current Connected has us do when The system is on it will start flashing and beeping saying low battery almost like it thinks there is no battery. So if you turn off the whole system then unplug the cable you can get it to start charging without the data cable hooked up. This allows the battery to go all the way through the cycle to float….wooooohooo, finally.

But we are still wondering why when you hook up the cable current connected sells, specifically made to go between the SOK and Cerbo it won’t allow the battery to charge with more voltage than around 53.2 ? If I shut system down and charge with out this cable it will charge in the 57v range . The battery is still in control off the whole system but something changes when this connection is made.

We are currently charging the batteries back up and we will see if the OVP goes off with the cable connected.. When the cable isn’t connected it can charge fine and go into float…so this is getting narrowed down.


I will be able to get the cells info once it starts yelling at me again. When the batteries are low the cells stay very close to each other.

I think the system is working right and I’ll monitor it today as it charges back up, hopefully I can get the SOK’s to communicate with the Cerbo after a few charges open loop.

Naz Solar talked with me for quite awhile and I have a much better understanding of how this all works together, especially the charge voltages.

Looks like your BMS is reporting as high as 55.26:




Looks like your shunt is reporting as high as 57.2V, but that's when the BMS is in protection.

Recommend the following:

1. Set logging to every 1 minute, so you see finer data.
2. Set DVCC voltage to 54.4V.

That should significantly reduce OVP events and still allow full/nearly full charging.

You really need to get cell data when OVP occurs, or it will be very hard to diagnose.

sunshine_eggo said:

Looks like your BMS is reporting as high as 55.26:

View attachment 207286


Looks like your shunt is reporting as high as 57.2V, but that's when the BMS is in protection.

Recommend the following:

1. Set logging to every 1 minute, so you see finer data.
2. Set DVCC voltage to 54.4V.

That should significantly reduce OVP events and still allow full/nearly full charging.

You really need to get cell data when OVP occurs, or it will be very hard to diagnose.

Click to expand...

Im sitting with it today all day and I will log it when it happens.

How do you set it more granular? All I see is the day info, and I don’t see how to get it down to the minute ?

Well it made it back to 54.4 without setting off the OVP… I’m guessing I need to start walking the voltage up higher slowly? Say 54.6

The cell voltages are moving around right now so maybe it’s best to just let it sit here over night ? I’m not really sure but I can tell you this is progress…

Here is the numbers when OVP goes off. This is after I turned up the Voltage to charge at 54.8 and it’s connected to the Cerbo




#2 Battery
1 3364. 9 3376
2 3465. 10 3369
3 3436. 11. 3598
4 3368. 12. 3398
5 3543. 13. 3364
6 3366. 14. 3360
7 3386. 15. 3361
8 3614. 16. 3398



#1 Battery
1. 3360. 9. 3386
2. 3367. 10 3375
3. 3437. 11 3361
4. 3395. 12 3393
5. 3364. 13 3367
6. 3359. 14. 3384
7. 3498. 15 3602
8. 3498. 16. 3592

For some reason the batteries shut down charging when this goes off. I can look at their screens and they both show no amps going in.

On my MUCH smaller SOK cells, it took a while at a small current to get the cells balanced. The “runners” were tripping the opv and then the balancers would slowly even things out. As they recommended, the smaller the charge current the better. I ended up bleeding some off the top cells, then just let it sit on the small charger. Took a few days to get everything in line and then it accepted normal currents and voltages.
It is in the documentation that the cells will be unbalanced due to shipping and storage. I was just an impatient sob.

G8trwood said:

On my MUCH smaller SOK cells, it took a while at a small current to get the cells balanced. The “runners” were tripping the opv and then the balancers would slowly even things out. As they recommended, the smaller the charge current the better. I ended up bleeding some off the top cells, then just let it sit on the small charger. Took a few days to get everything in line and then it accepted normal currents and voltages.
It is in the documentation that the cells will be unbalanced due to shipping and storage. I was just an impatient sob.

Click to expand...

What I don’t get is when I unplug communication it takes 57.6 and charges without tripping anything and goes to float. Why it trips OVP, is odd since my 5K won’t keep pushing Voltage to it when this occurs. At least not that I can see. Seems like maybe the BMS is telling the Victron to
stop.

I read in the manual where it mentions not going into float when the communication is hooked up. Is this how your system works ?

Although I’m sure I’m wrong, but that’s my take.

Those voltages clearly indicate an imbalanced battery. I would not say it is excessive, and this is common. It will improve over time and cycles

I am out of town without my computer. I am on my phone, and I can't stand typing with my thumbs. The phenomena you describe about attaining 57.6 volts is normal, there is a reason it happens, and it actually isn't working correctly. Please stop doing that.

Keep incrementally increasing the voltage until you start getting over voltage protection. Then knock it back a little. Keep increasing it every few days as it allows.

sunshine_eggo said:

Keep incrementally increasing the voltage until you start getting over voltage protection. Then knock it back a little. Keep increasing it every few days as it allows.

Click to expand...

@Haze I took his advice on this a while ago with my EG4-LL v1, same OVP symptoms as you.
I can get to 55.0V just fine now, the OVP trips at 55.3 or so last I checked.
There's no point in pushing it, capacity is close to 99%.
The DVCC voltage limit setting is extremely convenient.

Does the SOK SoC reset to 100% on OVP? (this page is full of acronyms)

The CCL (charge current limit) value is sent from the BMS to the Cerbo, check the battery Parameters menu.
It is probably being set to 0 telling the Cerbo to stop charging.

ricardocello said:

@Haze I took his advice on this a while ago with my EG4-LL v1, same OVP symptoms as you.
I can get to 55.0V just fine now, the OVP trips at 55.3 or so last I checked.
There's no point in pushing it, capacity is close to 99%.
The DVCC voltage limit setting is extremely convenient.

Does the SOK SoC reset to 100% on OVP? (this page is full of acronyms)

The CCL (charge current limit) value is sent from the BMS to the Cerbo, check the battery Parameters menu.
It is probably being set to 0 telling the Cerbo to stop charging.

Click to expand...

I can get it to around 99% before OVP triggers with it plugged in to the Cerbo, with it unplugged it gets to 100% but when it’s unplugged it charges with way higher Voltage and if I understand what Sunshine Eggo is saying it’s best I just charge with the Cerbo on so I can control the Voltage delivered to it.

The SOK doesn’t allow us to see the battery parameters on the battery screen, it’s locked down. The manual says they are supposed to come with Com cables that hook up to a PC so you can see some of this info, unfortunately neither of mine came from CC with those cables.

It's not charging with higher voltage when off cerbo. You are being tricked. I will explain when I'm at keyboard again.

99% vs 100% is completely irrelevant. Those numbers are for all intents and purposes, the same.

A picture is worth 1000 words... while you think you're achieving 57V+, you're not, or at least the battery is not:



As you can see when 57.2V is indicated, the amps to the battery is 0.

The battery has cut itself out of the charge circuit. Since you've unplugged the battery from the Cerbo, the charger is simply defaulting to its absorption voltage, and the charger is simply providing absorption voltage to the system while the battery is actually at a lower voltage

You can see shortly before you disconnected the battery, the battery was at 55.3V and current has dropped to 0.



I hope this makes it clear to you.

Keep incrementally raising the voltage in DVCC. Do not disconnect the comm cable from the Cerbo unless CC instructs you to do so.

Your situation is extremely common - battery cells are imbalanced, and they will slowly improve over time.

sunshine_eggo said:

99% vs 100% is completely irrelevant. Those numbers are for all intents and purposes, the same.

A picture is worth 1000 words... while you think you're achieving 57V+, you're not, or at least the battery is not:

View attachment 208318

As you can see when 57.2V is indicated, the amps to the battery is 0.

The battery has cut itself out of the charge circuit. Since you've unplugged the battery from the Cerbo, the charger is simply defaulting to its absorption voltage, and the charger is simply providing absorption voltage to the system while the battery is actually at a lower voltage

You can see shortly before you disconnected the battery, the battery was at 55.3V and current has dropped to 0.

View attachment 208319

I hope this makes it clear to you.

Keep incrementally raising the voltage in DVCC. Do not disconnect the comm cable from the Cerbo unless CC instructs you to do so.

Your situation is extremely common - battery cells are imbalanced, and they will slowly improve over time.

Click to expand...

Thanks for taking the time to explain this.

Ok I have another question. I hooked up my 450-100 MPPT today to my system/ Cerbo / multi plus . I have not hooked up my solar panels yet so maybe this is my issue, or maybe I don’t have an issue and it’s just me not understanding how this works.

So the MPPT screen is on, button is turned on but it shows it’s off on my cerbo for some reason . I was trying to go in a set its charge parameters to the same thing I have set on the multi plus. This is what I’m seeing.