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jctibor asked

Battery capacity on MODBUS

Hello everybody,


i am trying to read actual delivered capacity to the battery on MODBUS tcp from Venus GX in my C# application using victron multiplus + venux gx as setup. I am reading registers as follows in CCGX-Modbus-TCP-register-list-2.60.xlsx.



Battery Consumed Amphours (System) 845
Consumed Amphours 265
Deepest discharge 281
Last discharge 282
Average discharge 283
Total Ah drawn 286
Capacity 309


.. but every register returns me 0. I tried UnitID 246,247,100 ańd everything is the same.

Or Battery monitor BMV-700 / Victron Energy SmartShunt needs to be in the system?

Could you somebody help me?


Thanks

Modbus TCPbattery capacity
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matt1309 avatar image matt1309 commented ·

What message does it give you on the Cerbo gx if you go into settings?

Settings -> Services -> Modbus TCP. It's likely that there's a mismatch in UnitID or register but the error message may give you a hint as to where.

If there's no error then maybe it is the fact that there's just 0 in the register and that an additional device is needed.


How are you monitoring battery in your system? I'd have thought that if the battery data shows in VRM/cerbo gx (by BMS or however you're monitoring the battery) that it would be in modbus somewhere.


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jctibor answered ·

Hello,

it is required for BMV-700 / Victron Energy SmartShunt be in the system.


Jiri

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Modbus TCP Basics

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