Flooded lead acid battery bank rose to 44c while charging. VE Config not saving temp compensation.

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allswell asked Nov 19, '22

Flooded lead acid battery bank rose to 44c while charging. VE Config not saving temp compensation.

Yikes! That's hot. Is this something I should worry about? The room the batteries are in also houses our generator (extremely well ventilated building an forced commercial fan air circulation on at all times while the generator is running). So when we charge, the room heats up because of the heat from the generator running.

Is this kind of a temp nothing to worry about?

I have a 24v bank of twelve Rolls fla's: 6v 235ah batteries wired in 3 sets of 4 in series and then those 3 sets wired in parallel to make a bank of 24v 705ah. I have tried to change the temperature compensation in the VE Configure to be the -48mv/deg that the batteries require but VE Config will not allow the change to be saved for some reason. Not sure what I'm doing wrong!

I was able to change it in Victron Connect bluetooth app though... is that enough?

Thanks Community

This was the temp in the room as the charge began:

This is what the room temp rose to:

battery charging VEConfigure 3 temperature compensation

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screen-shot-2022-11-19-at-83857-am.png (51.9 KiB)

screen-shot-2022-11-19-at-83915-am.png (52.1 KiB)

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Alexandra ♦ commented · Nov 19, 2022 at 05:25 PM

@Allswell

Are you using STS in DVCC?

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allswell Alexandra ♦ commented · Nov 20, 2022 at 08:58 AM

Just checked in my DVCC and it would seem I am. I have that setting on. Is there something else that corresponds to it that I need to set up?

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Alexandra ♦ allswell commented · Nov 20, 2022 at 01:31 PM

It would depend on if you have more than one temperature sensor. Make sure the one for the battery is the one that is actually being used for control.

Hot batteries are a bit concerning. But your ambient is also quite high.

Are they being charged at the correct C rate? And are you sure all your terminals are tight?

And your room definitely needs better ventilation and a through draft if possible.

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allswell allswell commented · Nov 20, 2022 at 05:42 PM

Interesting. It says there:

Selectable sources for the battery temperature are:

BMV-702 battery monitor
BMV-712 battery monitor
SmartShunt
Lynx Shunt VE.Can battery monitors
Multi/Quattro inverter/charger
Solar chargers (if fitted with a temperature sensor)

However, I'm using the temp sensor that is connected to the Cerbo GX however, I purchased a Smart Battery Sense as well so that I could get readings on the batteries that are from halfway up the battery on the side, rather than from the post... however I don't see that option as a selection in the STS... my system calls the temp sensor from the Cerbo GX the "Battery temperature sensor (1).

Any idea how to use the SBS for the STS? Wouldn't that be more accurate? How to get that to connect to the Cerbo GX brain of it all though?

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screen-shot-2022-11-20-at-94136-am.png (53.4 KiB)

Alexandra ♦ allswell commented · Nov 20, 2022 at 06:54 PM

@Allswell

The smart battey sense only work with bt smart networking with mppts. So not useful for you here.

And you can't run a smart network and have a GX together.

Have you verified the temperature sensor on the cerbo is correct? sometimes you need to calibrate them.

And yeah for the STS it has to be one that is listed, or it cant use the data.

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Answer 1 · 2022-11-20T19:14:04Z

snoobler answered · Nov 20, 2022 at 07:14 PM

If you're actually running the batteries at elevated temperature, you're going to shorten the life of your batteries by a good measure:

https://support.rollsbattery.com/en/support/solutions/articles/246381-flooded-battery-capacity-temperature

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