Battery capacity on MODBUS

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jctibor asked Jun 5, '23

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 TCP battery capacity

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matt1309 commented · Jun 08, 2023 at 09:42 AM

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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Answer 1 · 2023-10-02T11:47:52Z

jctibor answered · Oct 02, 2023 at 11:47 AM

Hello,

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

Jiri

2 |3000

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