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Mark avatar image
Mark asked

DVCC - Battery Temperature Sensor

Hello,

I am setting up an off grid setup with a 24v 3000VA MultiPlus, 150V/85A Smart Solar MPPT, BMV-712 & CCGX.

I am using the battery mid-point voltage as the Aux input on the BMV (so can't also use the BMV to monitor battery temperature).

I plan to enabe DVCC and wanted to know/confirm if the data from the battery temperature sensor connected to the MultiPlus will be 'shared' with the MPPT via the DVCC feature?

I really want the MPPT to receive/use accurate & up to date battery temperature data for the charge voltage compensation.

Thanks in advance.

Best regards, Mark C.

Temperature SensorDVCC
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3 Answers
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Unfortunately not. This is a known limitation we would like to address in the future, but at this stage shared temperature in offgrid is limited to the BMV-712 temp probe, and ESS systems.

Another option would be the Smart Battery Sense to give the MPPT precise temperature awareness.

Perhaps consider the smart battery sense so you can keep your midpoint voltage reading.

This presumes a smart Bluetooth enabled MPPT on the compatibility list.

https://www.victronenergy.com/accessories/smart-battery-sense




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Mark avatar image Mark ♦♦ commented ·

Thank you for the fast response Guy.

Do you have any rough timing for when the DVCC shared temperature sense feature will be expanded to also use the MultiPlus temperature sensor? (As that would be my prefered arrangement)

I also think that 2 separate wired temperature sensors is a bit messy.

Reading the smart battery sense manual I was also under the impression that it is not recommended or allowed to be used together with a CCGX?

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Elimac avatar image Elimac Mark ♦♦ commented ·

As far as I understood, the conflict is there only if you enable DVCC and Voltage + temperature sensing. If you enable DVCC but disable Temp and voltage sense, I think the smart sense can be used with CCGX. But I might be wrong... I also would like some clarification.

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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

The Smart Battery Sense is intended to be paired with the MPPT, not the CCGX (which has no bluetooth). I would disable the Shared Voltage Sense feature in DVCC on the CCGX - I have personally found this feature to cause more issues than it solves.

The Smart Battery Sense is intended to be mounted directly to the battery, and can be made quite elegant.

I have no information on when full shared temperature data from the Multi would be available; nor why it isn't available now that might be preventing that functionality. But even shared temperature data from the BMV is a relatively new feature, so there is hope.

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mvader (Victron Energy) avatar image mvader (Victron Energy) ♦♦ commented ·

Hi, you wrote:


> I have no Information on when full shared temperature data from the Multi would be available; nor why it isn't available now that might be preventing that functionality.


It will take quite a while for the battery temperature as measured by the Multi is shared to other devices. Requires firmware updates in multiple products. And other priorities.

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porcini avatar image porcini mvader (Victron Energy) ♦♦ commented ·

Hi, are there any news about this? I would also like the MPPTs to take the Multi's temperature measurement.

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mvader (Victron Energy) avatar image mvader (Victron Energy) ♦♦ porcini commented ·

Yes this is part of the underway v2.30 release.


No dates though. Could be one month; could be several.

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Mark avatar image Mark ♦♦ mvader (Victron Energy) ♦♦ commented ·

Hi @mvader,

Even though it is still a month or so away that's great news!

Over the past few months I have been regularly following the progress through the Github ticket #374 & saw that the initial implementation was complete about a month ago.

What about DISPLAY of the temperature reading - has there been a decision made about that?

I understand the possible 'display' accuracy concerns you had (since it was never intended for this purpose, with small increment steps), but if you can get the temperarure display (based on the Multi temp sensor) to function at an acceptable level then that would be my strong preference.

I like information / data, rather than running blind...

Regards, Mark.

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Mark avatar image Mark ♦♦ mvader (Victron Energy) ♦♦ commented ·

2nd question - I assume that the temperature reading from the Multiplus temp sensor will still be sent/shared, even when the Multiplus is turned off? (turned off via the CCGX only)

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Mark avatar image
Mark answered ·

Thank you very much for the additional information Matthijs.

So by the sound of things it is not that simple but will be an option available at some stage in the future.

Hopfully it is sooner rather than later & I will eagerly await this update.

I already have a MK3 to USB interface to update the Multiplus firmware, so no issue with that aspect.

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Related Resources

DVCC chapter in GX manual  

Victron temperature sensor disambiguation table - which product supports which sensor