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peter-vddriessche avatar image
peter-vddriessche asked

Modbus register for the volume of energy stored in the battery

I am using ModbusTCP to program a battery control algorithm. I am looking for a way to track energy/power stored in the batteries.

There are no such registers, as far as I can see (with registers 1030-1038, I can track the cumulative energy produced by the PV installation; with 2603-2605 I can track the cumulative energy taken from the grid,etc). Does anybody know how I can track the energy charged/discharged in the battery.?

I could measure the battery power every second/minutre and sum them over time (integrate the curve) but that is a tedious process.

Any suggestions?

Modbus TCP
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2 Answers
thomasw-1 avatar image
thomasw-1 answered ·

Please have a look into Modbus register definition at https://www.victronenergy.com/live/ccgx:modbustcp_faq. Request the Excel-based overview from Victron.

On my side registers 840-843 work well.

As I can see register 1030 is deprecated and covered phase 1 energy, was therefore not related to battery.
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enrique-marquez avatar image
enrique-marquez answered ·

Hello Peter,

@peter_vddriessche

To get data of battery you need a battery monitor , ej. BMV700 and you see all data in registers 259-326 with the id corresponding, the registers 840-843 are corresponding to battery monitor selected in the GX\System Setup/battery monitor


Regards

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peter-vddriessche avatar image peter-vddriessche commented ·

Thanks Enrique.

I have a can-Bus monitored battery and no BMV700. That explains why I cannot read registers 301-302 (charged and discharged energy), I suppose. I can read 840-843, though, but are not in kWh but in V, A or W.

Would it help for 301-302 if I select in the GX/Ssytem setup not "Can-Bus' but "Multiplus II on VE.bus"?

Best regards

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