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gnagflow asked

dvcc max charge voltage not working - why

Hello, I tried to use the DVCC max. charge voltage several times at different ess systems, but it never worked. I need to reduce the charge voltage in ess only during summer, when the batteries are always full, customers asking those settings, because they want to increase the life of the batteries, full charge is always bad, in summer batteries stay long time at full charge, see picture.

I tried to update to GX 2.90 but doesnt work.

I tried it at systems with CAN bus controlled battery (REC-BMS for Victron) and at systems without CAN controlled battery.

Always, the Multiplus2 is charging the battery until either the BMS switches the CCL to zero or without CAN bus battery the multiplus charges until it arrives its max. voltage set by ve-configure.

It never accepts the DVCC max. charge voltage, WHY? Why does this important feature do not work for any of my customer installations?

Thank you for your help!

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ESSDVCC
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3 Answers
nickdb avatar image
nickdb answered ·

Have you tried it without the shared voltage sensor enabled in DVCC?

Generally with lithium batteries and higher voltages it would be disabled.

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gnagflow avatar image gnagflow commented ·

Thank you for you input, but unfortunately the change has no influence. DVCC max. voltage has no effect, see picture from right now:

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nickdb avatar image
nickdb answered ·

No idea why it doesn't work for you. Is this a CAN BMS and the mppt's are all reporting BMS external control?

If I set a lower voltage maximum, the system takes a few seconds then starts discharging the battery until the voltage is reached. So working perfectly.

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nickdb avatar image nickdb ♦♦ commented ·
This setting wasn't intended for this use case, it was primarily designed to help with battery balancing. It also will only work with a managed battery, it does not work with lead acid/unmanaged batteries.
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johanndo answered ·

Read the manual of the cerbo, the section about DVCC, what controllers and BMS are supported and what not and how DVCC acts or doesn't act on unsupported devices. REC delivers the Victron parameters and acts like a Victron BMS, fully supports DVCC, but with a Victron specific firmware only, you have to ask for it when ordering, you can install it later too - the hardware is the same. You have to configure the parameters ON THE REC ABMS to take effect, they are changing dynamically to control charging. The parameters on the Cerbo are the upper bonds only.

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