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Juraj Nikolov avatar image
Juraj Nikolov asked

ESS and DVCC ignoring max charge current setting

Why VenusOS ignore settings in ESS and DVCC?

In DVCC, I have set the maximum charging current to 100A ... but it charges more and ignores the 100A limitation, can you advise why? I assume that pylontech's BMS is superior (master) to that setting, and if Pylontech has the option to charge 148A, the system will charge 148A if it has that option...
In ESS, I have set the limit for inverter power to 4000W, VenusOS is ignoring this setting...
I also set the Feed In to 3500W and it simply ignores it, sending 4000-4500W + plus idle consumption of the object until the converter overheats...
Have you encountered something similar?All devices firmware update as latest


Thank you |:)

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ESSDVCC
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4 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

We had that topic already a few times, please use the search function.

Do you have DC feed-in activated?

https://community.victronenergy.com/questions/187320/dvcc-feedin.html


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Juraj Nikolov avatar image Juraj Nikolov commented ·

@Matthias Lange - DE thank you, I will look for it

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gazza avatar image
gazza answered ·

The first part of your post is explained in the DVCC section of the Cerbo/GX manual:

6) DVCC charge current limits are not applied to DC MPPTs when ESS is enabled with Allow DC MPPT to export. This is to get maximum output from the solar panels for export.

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Juraj Nikolov avatar image Juraj Nikolov commented ·

@Gazza thanks and it is some way how to sett. that DC charge (A) the battert under ESS ? Intresting is that wokrs fine (this dvcc) up to cca 6kwp ... wtih more kwp get max. output ... That is little supid not ? Or only way is add battery with which can hold battery system charge current and not start to burn :P

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Juraj Nikolov avatar image
Juraj Nikolov answered ·

@Gazza

In connection with this topic, I am solving the topic with connection to pylons (parallel) + 2 x 15 280Ah cells, since I have them unused... It will not be controlled by BMS but by SmartShunt. So +- AutoBus, those cells can easily handle much more than 148A, which in my case is 4xU3000C, so I should be able to handle min. absorb from the MPPT 444A after connecting the given cells... ahem, now they are able to give me MPPT regulators 220A as it is quite brutal for the household and I don't know if I want to have it in the house :D

Yes, I thought of reducing the charging current on the mppt controllers too, but I didn't have to expand the PV array by 5kwp :D
I let the documentation get carried away, where it is nicely described how the mppt regulators will work together :), but yes, I admit. I overlooked the fjuture regarding ESS and DVCC...
For me personally this is a gross failure on Victron's part... it's as expensive as cocaine and they don't offer a solution for this as I've read for years... What can be solved by software.. Don't let anyone tell me it's not possible create an algorithm that will not correlate with what converter is used and how many there are + depending on the SOC. Otherwise, it can't happen that VenusOS alone, based on the data it has in the configuration, sends 200-300A to the battery ... but that's so stupid, that it sends the 200-300A ... : )) Completely stupid question :D system without BMS (BMS is there but not connected from VenusOS) only via SmartShunt, how does it know which CCL to use??? :D
I think that for the money they will earn from it and the law :) they could move their ass and brains as a unit on the market. ;)

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herculess avatar image herculess commented ·
It is possible by adjusting the grid setpoint, but this is done at your own and by software (nodered). but this regulation depends on software and i am not sure if i would trust that 24/7 ;)

i solved that by adding enough battery power.


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beat avatar image beat herculess commented ·

There might also be a programmatic solution using NodeRed in the Cerbo GX, if.... But it really is a workaround for an expensive conception bug that Victron could really fix.


Just E.g. I just managed with it to control the AC grid setpoint to offset any other load, using a Smappee grid-meter, having now an average zero consumption from the grid on Sunny days when the load is reasonable.

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Juraj Nikolov avatar image Juraj Nikolov herculess commented ·

@herculess

But that should primarily be handled by victron... via VenusOS
As variables, they are probably quite clear :D
As I already wrote then, it's as expensive as cocaine :D What a shame and a mockery compared to the Chinese competition in this field.... And I'm presenting this to Victron customers as the Ferrari of FV systems :D I'll probably rename it to UAZ :D
What is more valuable a weather forecast or a solution to such a problem :D ??? :D
I will also solve it by increasing the battery capacity....

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h8mecz avatar image
h8mecz answered ·

But what about L2 batteries - now I have 10,65kWh with nominal 100A charge current and peak 110A for 15 seconds. But when I enlarge the capacity - I will have the same charging currents value. So I am in deep sh*t ... :D :( High charge current alarms are usual for me! :(

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