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tkrohmer avatar image
tkrohmer asked

Can I use DVCC with CCGX, BMV-700 and Multiplus compact?

So I have 2 12V GEL batteries connected in series to a multiplus compact 24V/1600VA/40A. The multiplus reads 16V, so it triggers the low voltage alarm and sends every bit of power to the batteries when they are fully charged. I also have connected a BMV-700 and a CCGX to monitor the situation.

I have tried enabling DVCC so that the BMV shares its reading with the multiplus but I haven'yt been able to make it work.

What are your suggestions?

Is the multiplus dead and needs replacement?

How can I make the DVCC feature to work correctly?


Thanks.

MultiPlus Quattro Inverter ChargerBMV Battery MonitorCCGX Color ControlDVCC
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3 Answers
Mark avatar image
Mark answered ·

What firmware version are you running in the the CCGX, Multiplus, BMV and MPPT if you have one - they must be newer than a certain version for it to work. So update the firmware in all devices to the latest released as a first step.

https://www.victronenergy.com/live/ccgx:start

You also need to restart the Multiplus after enabling DVCC for the changes to take effect.

But regarding your system/setup, you have a HUGE 10v voltage difference - there is some kind of PROBLEM, this is not normal or something that DVCC will fix.

Use a digital multimeter to measure the voltage directly at the Multiplus battery terminals to confirm if your problem is in your wiring (what I suspect) or the actual Multiplus unit (or maybe but more unlikely, the Multiplus voltage reading is the true battery voltage and the BMV is faulty/over-reporting)


screenshot-2019-10-04-08-50-13-1.png (257.2 KiB)
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tkrohmer avatar image tkrohmer commented ·

I checked the firmware of all devices and it's all up to date, the conectoins are all ok and the multimeter shows the same as the BMV. So I conclude that the multiplus is failing to read the correct voltage and acts acording to the voltage read. I was interested in DVCC because I thought that maybe the BMV reading would override the Multiplus' own reading and would charge the batteries with the values reported by the BMV.

I have read the DVCC part in CCGX manual and I can't find anything that tells me that It can't be done, or I am missunderstanding the intended use of the DVCC feature.

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anthony answered ·

@tkrohmer first you have to select the BMV as the soc source so it can share it's soc reading to the CCGX https://www.victronenergy.com/live/ccgx:start#battery_state_of_charge_soc

Also if your batteries are showing 16V and not holding charge as you suggest, it sounds like one or both of them is faulty.

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tkrohmer avatar image tkrohmer commented ·

Thanks for your answer @Anthony.

The BMV shows the correct voltage and i measured with a multimeter and the batteries seem ok and fully charged. The battery monitor in the CCGX is set to BMV.

I still can't get the multiplus to use the BMV readings.


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anthony avatar image anthony tkrohmer commented ·

Have you thoroughly checked the connections from the battery bank to the Multi? Have you measured the DC voltage on the terminals in the Multi?

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tkrohmer avatar image tkrohmer anthony commented ·

Yes, it currently has 26,04V same as measured by the BMV and the multi shows 15,66V.

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anthony avatar image anthony tkrohmer commented ·

Where are you viewing the lower voltage of 15.66 or whatever it is now?

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tkrohmer avatar image tkrohmer anthony commented ·

In the Multiplus section of the CCGX.

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

The MultiPlus Compact has a fuse inside, maybe this fuse is blown?!

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