question

Martin Gasthuber avatar image
Martin Gasthuber asked

BYD LVL 15.4 - High Battery Voltage Warning

Hi,

since 2 days i've connected new BYD LVL 15.4 (two units) to a single MP-II 48/5000 together with 2 MPPTs chargers. Installation and configuration went smootly, following the Victron provided docs. All components running the lastest SW and no connection problems exists. Since the initial full charge i saw Voltage Warnings from the BMU (and on the CCGX following) - the Battery voltage is displayed at 55.3V and thus slightly above the documented limit. I though that CCGX (venus) is dynamically controlling the DC voltage receiving the changing limits from the BMU ? Any other option to correct in order to avoid these warnings ?

best regards,

Martin

Multiplus-IIMPPT ControllersVenus OSBYD
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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @martghh,

I have been running one of these LVL batteries myself for a while now, and with the current firmware, I haven't seen any warnings or alarms.

Can you please provide the VRM site id so I can have a look at the alarm log to see how often it is happening and what might be causing it?

The first thing I can think of, is with 2 units they might not be perfectly state of charge synchronised to be begin with, and could get some warnings until they are both balanced. I would expect this to happen within a few days, and a few charge cycles and plenty of time close to fully charged though.

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Martin Gasthuber avatar image Martin Gasthuber commented ·

Hi Guy,

you mean this id ? edit- redacted - odin_island will do

-- Martin

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Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ Martin Gasthuber commented ·

Thanks @martghh,

I'll follow it up and get back to you.

Would you be willing to test my theory and isolate/disconnect one of the batteries to see if the warnings stop when only one is connected?

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Martin Gasthuber avatar image Martin Gasthuber Guy Stewart (Victron Community Manager) ♦♦ commented ·

basically yes - i would consider waiting a few more charge cycles - if the warning do not disappear, i'll disconnect and see what happens then. By the way - according to various documentations it will be beneficial to 'not always' fully charge the batteries and leave them basically in a partly charged state. If this is true, how to configure this ?

-- Martin

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eddies avatar image eddies commented ·
Hi Guy,


I am getting some high voltage alarms on a large off grid system with LVL batteries. I can see the charge voltage within the BYD parameters is set at 58.4V. I am getting alarms turn up at 57V. Is there any way to lift the alarm limit or is there an issue at this site. Happy to share VRM log ins or take this off line if required.


Eddie

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Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ eddies commented ·
Have you had a look at the cell max/min voltages in the advanced section of VRM?

If a cell is out, then it will throw the over voltage warning, even if the bank as a whole is below target voltage.

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