Modbus TCP & Control of Cerbo GX/Quattro

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mikeseaman3000 asked Jan 11, '21

Modbus TCP & Control of Cerbo GX/Quattro

Hi Everyone,

I need a little help with Modbus Control. I have a Cerbo gx and quattro unit with pylontech batteries. It is all working perfectly however i am looking to interface to my home automation system.

Does anyone have experience with Modbus TCP registers on here?

I am looking to enable and disable charge plus also have the option to maximise the output of the inverter so that I am able to to discharge to grid where possible. Any help with some configurations of the Modbus.

So basically any help with modbus config is great. I have got the communication working perfectly and able to read values from the cerbo gx, i.e. SOC of batteries. via modbus.

Appreciate any help.

Thanks

Mike

MultiPlus Quattro Inverter Charger cerbo gx Modbus TCP

4

2 |3000

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nickdb ♦♦ commented · Jan 12, 2021 at 10:48 AM

Have you downloaded the list of registers? It details which are writeable and which not.

First place to start is to see if what you want to set can be set.

I want to change the ESS inverter limit by time of day and weather, unfortunately this register does not exist as far as I can see so that pretty much torpedos my automation plans.

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mikeseaman3000 nickdb ♦♦ commented · Jan 12, 2021 at 11:48 AM

Hey,

Thanks for the reply. Yeah i managed to download the registers, but i cannot seem to force the charge and discharge over Modbus. Any ideas?

Is there not a way to write to the grid setpioint for Inverter Limit. You can do a calc in your external controller that takes the consumption and limits what the inverter outputs?

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nickdb ♦♦ mikeseaman3000 commented · Jan 13, 2021 at 05:47 AM

what home automation are you using?

I have been working with home assistant which seems to work fine.

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gnsa14 nickdb ♦♦ commented · Oct 11, 2021 at 10:38 AM

Hi nickdb,

Can you tell me which registers you are using to control the charge / discharge limits? I am running ESS in mode 1 (maintaining 0 watts grid flow)
I have reviewed all the writable registers in the CCGX Modbus TCP register list v2.7 but cannot find any that will allow to control these two via HA.

What I am wanting is not to force the rate, only to limit the rate.

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1633948536822.png (48.1 KiB)

Modifications Space

Node Red Space

Answer 1 · 2022-05-16T11:50:33Z

lifeingalicia answered · May 16, 2022 at 11:50 AM

I have not played with those but

should be register 2316 but it is current so it would be in amps or ESS registers 2701 2702 but these are in % 2704 which is named current but is in W

2 |3000

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Answer 2 · 2022-11-06T11:53:00Z

mcflexus answered · Nov 06, 2022 at 11:53 AM

Any update on this? I really want to do the same, in the correct way. If not possible would it be thru mqtt or node red? Modbus would be the nicest iption tho.

2 |3000

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Answer 3 · 2023-12-11T11:51:35Z

juniorpv answered · Dec 11, 2023 at 11:51 AM

My system setup is with Multiplus2 3000 and CerboGX. Presently with an old Lead Acid Battery.

I'm struggling to control feed-in power via modbus.

I'll try via Node-Red &/or via Remote Console on LAN.

Sometimes it looks like it works - somehow, but I think, I've a general misunderstanding.

Any help, as well via zOOm would be appriciated.

2 |3000

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