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mikeseaman3000 asked

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 Chargercerbo gxModbus TCP
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nickdb avatar image nickdb ♦♦ commented ·

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 avatar image mikeseaman3000 nickdb ♦♦ commented ·

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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3 Answers
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lifeingalicia answered ·

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

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mcflexus answered ·

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.

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juniorpv avatar image
juniorpv answered ·

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.

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