Orion XS / Is it possible to get remote battery voltage through VEdirect & DVCC

DIY
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Hello All,

I am seeking advices and knowledge from the community.

I am considering using an Orion XS connected to a VenusOS/GX system through VEdirect to charge a LiFePO4 battery. The VenusOS is setup in DVCC mode and is getting battery data from a BMS (REC-ABMS connected through CAN bus). The idea is that the XS will receive voltage and current set points from the VeusOS operating DVCC based on BMS data & requests.

I would like to know if the XS will receive the battery voltage measured by the BMS (to be more accurate and compensate for cable losses). I have been through the documentation but I did not find specific information on the subject.

Thanks in advance,

Best regards,

SmoothFroggy

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Section 2.2 in the manual states that it can be controlled by DVCC from a GX device.

Go to the manual, search for DVCC, would provide an answer.

3

Hello pwfarnell,

Thanks for your answer.

I have been reading a second time through the manual :

  • “The Orion XS can be DVCC controlled via a GX device, provided it is connected to the GX device via the VE.Direct port and the Orion is switched to charger mode (there is no DVCC control when the Orion XS is in power supply mode). Charging currents and voltages are then set automatically; thus, the internal bulk, absorption, and float algorithms are no longer used. Charging or discharging are stopped at low or high cell voltage or low temperature.”
  • The rationale for my original question is that it is specifically stated that with DVCC from a GX, the charging currents and voltages are set automatically (I expect from the BMS that is sending regularly these values). Nothing is stated regarding remote sensing battery voltage, ie, the actual voltage existing on the battery.

The sole information I have found regarding remote battery voltage sensing is through :

  • Remote voltage-, temperature and/or current sensing via VE.Smart Networking.
  • Use VE.Smart Networking to receive Vsense, Tsense and Isense data over the wireless network for your Orion XS DC-DC battery charger, for example, from a BMV, a SmartShunt, or a Smart Battery Sense1). The charger uses the available information from the battery to optimise the charging parameters. This improves charging efficiency and extends battery life.

I would be very grateful if you could enhance your answer and point the documentation stating that battery voltage remote sensing is provided by DVCC protocol through VEdirect to the XS ?

Best regards,

SmoothFroggy

4

The general section I linked to contains the sentence

“For more details about DVCC, please see the GX device manual.”

So, read the DVCC section, especially SVS. Note, with some BMSs, SVS is disabled.

It is all there, it answers your questions.

5

Its not. DVCC synchronises target voltage and current across all chargers in a system, it does not transmit actual battery voltage.

Actual voltage can be transmit trough VE.smart network, while one of the devices in it will be master, and the others will use that as a reference instead of their own. While you can use it to mitigate cable losses for example, i suggest to rather fix those losses.

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The SVS, SCS and STS functions in DVCC do transmit the battery voltage, have a read of the manual. I used this feature for years. Tje only proviso is if your BMS disables it, usually because the system can get isolated from the battery measurement of the BMS disconnects.

Shared Voltage Sense (SVS)

This feature is compatible with VE.Bus devices, VE.Direct and VE.Can MPPT solar chargers, Orion XS DC-DC battery chargers, as well as Inverter RS and Multi RS.

The system automatically selects the optimal voltage measurement. If available, it prioritises the voltage from the BMS or a BMV battery monitor. If neither is accessible, it defaults to the battery voltage reported by the VE.Bus system. The voltage displayed on the GUI corresponds to the selected voltage measurement.

7

Will do, i try to stay out of topics i dont fully understand, but noticing that is a struggle. Thanks

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Hello pwfarnell,

Thanks a lot for your answer. I apologize for the late reply ; I was not in the position to consult earlier.

I knew about SVS, SCS and STS from previous reading (when I built my GX based on a RaspberryPI & VenusOS, ie somehow before the XS appeared). I completely missed the update in the GX manual : ‘This feature is compatible with VE.Bus devices, VE.Direct and VE.Can MPPT solar chargers, Orion XS DC-DC battery chargers, as well as Inverter RS and Multi RS’. I was also puzzled by the XS manual refering to VE.Smart Networking for remote sensing and misinterpret it as the sole method for remote sensing as there was nothing specific on that subject in the manual.

Thanks again for your guidance,

Best regards,

SmoothFroggy

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