VE.Bus System [276] - Low battery: Alarm

Question

question

mryoshii asked Jul 23, '21

VE.Bus System [276] - Low battery: Alarm

Hi im getting a VE.Bus System [276] - Low battery: Alarm and i down't know why its comming up every time. It starts beeping and sends e-mails.

The min discarge is 75%

Thanks for any help.

VE.Bus

1627024149222.png (362.5 KiB)

1627024280573.png (21.9 KiB)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2021-07-23T10:12:08Z

Alexandra answered · Jul 23, 2021 at 10:12 AM

@MrYoshii

If you are running ess assistant, then you need to check your voltages for the c rating, maybe lower them a bit.

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 2 · 2021-07-23T10:32:54Z

mryoshii answered · Jul 23, 2021 at 10:32 AM

@Alexandra i got them like this:

do you have any recomendations? im useing 2x 12v 230Ah AGM batteries.

1627036296006.png (53.8 KiB)

3

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra ♦ commented · Jul 23, 2021 at 10:45 AM

@MrYoshii

And your sustain voltage? Is is above the c ratings you have set there.

These settings will affect the longer duration alarms, but i do also see you have shorter alarms for maybe when your system is under load.

it is possible your battery bank is not able to provide the amps needed before the voltage is collapsing to low, the other possibility is your cable is undersized? These are the othwr two most common causes.

Under the advanced tab you can download the csv data for the alarm period and the excel sheet will show what the voltage is dropping to in the system. The color control also shows the voltage of the bank at the time of alarm.

0 ·

Alexandra ♦ commented · Jul 23, 2021 at 10:47 AM

They do look ok, so how much higher is the sustain voltage?

0 ·

mryoshii Alexandra ♦ commented · Jul 23, 2021 at 10:56 AM

This is sustain voltage.

0 ·

1627037773009.png (45.0 KiB)

Answer 3 · 2021-07-23T13:12:00Z

Alexandra answered · Jul 23, 2021 at 01:12 PM

@MrYoshii

https://www.victronenergy.com/media/pg/Energy_Storage_System/en/controlling-depth-of-discharge.html#UUID-6b8f380a-3e19-c040-9dad-673577d775d5

See section 6.4 Sustain mode.

Your sustain voltage is higher than your discharge voltage for 0.005c so at about 1.15A it is triggering the low battery warning and trying to sustain the higher voltage.

You can lower the sustain a bit maybe down to 23v on the top one. That way on your .25c draw at least, your low battery is not triggered. (About 57A draw from the bank so on a 24v system about 1200W load)

1

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

mryoshii commented · Jul 23, 2021 at 01:31 PM

ok i have changed it now. I will test it now and give feedback. Thanks for now.

0 ·

Answer 4 · 2021-07-24T21:30:48Z

mryoshii answered · Jul 24, 2021 at 09:30 PM

@Alexandra its still showing the alarm.

2

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra ♦ commented · Jul 28, 2021 at 06:39 PM

@MrYoshii

Are they occurring less often or the same?

Are you able to see in the advanced tab what your battery is actually doing during these alarms? Basically what may be happening (and i am guessing as i do not have all the data from your system) is the battery voltage is sagging under load - maybe they are weak? or cabling is undersized?

I assume you have a 24v 3 kva system?

0 ·

mryoshii Alexandra ♦ commented · Jul 29, 2021 at 07:22 AM

i don't see anything that could be wrong.. the min voltage is 23.91

I have dissabled the alarm compledly because the peeping is anoing. But this should not be the answer to this problem. Now i have no alarm if the battery is untervoltage.

0 ·

1627543225979.png (99.6 KiB)

Answer 5 · 2021-07-25T05:53:15Z

Paul B answered · Jul 25, 2021 at 05:53 AM

Also on the vrm under setting and then select allarm rules in there is allarm settings that can also be configured

1627192371131.png (31.3 KiB)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 6 · 2021-07-27T12:50:38Z

mryoshii answered · Jul 27, 2021 at 12:50 PM

@Paul B I have not set anything here.

1627390218858.png (140.6 KiB)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

question