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  1. #21
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by ekkekan View Post
    The voltage at 12.5V per battery still seems good although it was under low load.
    Are you sure you have checked that you cannot increase the cut off voltage to about 47V. Better not to discharge down to 42V.
    This could be part of the reason why they only lasted 16 months.
    That's the built-in setting for AGM, otherwise I have to do a User-defined setup, and I'm not sure what I'm doing
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  2. #22
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    That's the built-in setting for AGM, otherwise I have to do a User-defined setup, and I'm not sure what I'm doing
    What controller/inverter have you got?

    User defined is what you need to do
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  3. #23
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Prof View Post
    What controller/inverter have you got?
    User defined is what you need to do
    It's an Axpert 5kVA - previous model to this one: https://www.takealot.com/axpert-5kva...r/PLID46878819


    Ok, User-Defined it is then, any guidance on the settings to be used?
    Last edited by Orxy; 2021/06/10 at 09:09 AM.
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  4. #24
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    Default Re: Lifetime of Victron batteries

    From 'oldish' 24V Axpert manual.

    Default is 21V or as in your case 42V
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  6. #25
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Prof View Post
    From 'oldish' 24V Axpert manual.
    Default is 21V or as in your case 42V

    thanks, what I am looking for are the settings when choosing User-Defined as the battery type.
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  7. #26
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    Default Re: Lifetime of Victron batteries

    Charging spec for Gel battery on page 4

    https://www.victronenergy.com/upload...tteries-EN.pdf
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  8. #27
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Prof View Post
    Charging spec for Gel battery on page 4
    https://www.victronenergy.com/upload...tteries-EN.pdf

    Ok, set as per the specs, and pushed the Low Battery to 47V
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  10. #28
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    Ok, set as per the specs, and pushed the Low Battery to 47V
    If still in doubt on the USE settings I would take these settings as workable as it comes from a major installer of these inverters.
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  11. #29
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    Ok, set as per the specs, and pushed the Low Battery to 47V
    Good. Sticking to Victron's specs as per the manual, helps a lot when diagnosing the issue.
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  12. #30
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    Default Re: Lifetime of Victron batteries

    At the request of the shop, I took some measurements with a brand new MajorTech MDT10 multimeter (no Flukes in stock anywhere in Stellies):

    Click image for larger version. 

Name:	Victron Battery Measurements.JPG 
Views:	88 
Size:	43.2 KB 
ID:	618307

    The Low Battery alarm kicks in at 49.2-49V even though the setting is 47V - is that normal?

    So basically with the barest minimum load (router, PC, laptop) I can't even get through more than 1h45 of loadshedding.
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  13. #31
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    At the request of the shop, I took some measurements with a brand new MajorTech MDT10 multimeter (no Flukes in stock anywhere in Stellies):

    Click image for larger version. 

Name:	Victron Battery Measurements.JPG 
Views:	88 
Size:	43.2 KB 
ID:	618307

    The Low Battery alarm kicks in at 49.2-49V even though the setting is 47V - is that normal?

    So basically with the barest minimum load (router, PC, laptop) I can't even get through more than 1h45 of loadshedding.
    You mention the low alarm kicks in at 49V. Bear in mind we were mentioning the setting where the inverter would switch off at 47V. This is correct as it gives you an alarm prior to switching off. 2 different settings.
    Refer to the bottom of my picture in post #28.
    It would seem your batteries have lost a lot of capacity. When fully charged only at 13.4V with charger still on seems lower than normal. Also the quick drop to 12.4V under an about 10A battery load.
    Last edited by ekkekan; 2021/06/12 at 07:35 AM.

  14. #32
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by ekkekan View Post
    ... It would seem your batteries have lost a lot of capacity. When fully charged only at 13.4V with charger still on seems lower than normal. Also the quick drop to 12.4V under an about 10A battery load.

    Weird, because the max in-charge voltage I've seen with the previous and current batteries is 54.0V. This is a photo taken just after I installed these Victrons, if you zoom in a bit, you can see the voltage is t 54.0V.

    But yes, it seems that they've lost a lot of capacity.

    Any way to revive them? I have a Ctek, would that help?
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    Last edited by Orxy; 2021/06/12 at 09:06 AM.
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  15. #33
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    Default Re: Lifetime of Victron batteries

    feedback from the shop:

    "The figures look very reasonable. The batteries are balanced and look to hold their charge. You do not need to revive them at all.The low battery alarm should only come on at about 48V or even 47V. Maybe you can adjust that in your inverter.
    I think your DC cables may be a bit thin, so, when under LOAD, the voltage at blatteeis may not be the voltage that the inverter sees at its terminals. Maybe you can test that."
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  16. #34
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    Default Re: Lifetime of Victron batteries

    Those cables seem 25mm sq?
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  17. #35
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Prof View Post
    Those cables seem 25mm sq?
    Diameter of 12mm.
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  18. #36
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    Default Re: Lifetime of Victron batteries

    Just did another test now, with a load of +-500W: switched off the Mains and the voltage dropped from 54V to 50V within 2 minutes - that's not good, right?
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  19. #37
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    Just did another test now, with a load of +-500W: switched off the Mains and the voltage dropped from 54V to 50V within 2 minutes - that's not good, right?
    Very bad test that tells you very little. The extreme drop in voltage is due in part to stripping “surface charge”. ie going directly from charging to discharging.

    Rather charge the batteries. Remove the charging and let settle for 30 minutes or so, monitoring the voltage until it is stable. Ie going from charged and settled to discharging.

    It’s a bit like pouring a draught beer. You only know how much beer there actually is when the froth settles.
    Last edited by Fluffy; 2021/06/12 at 11:26 AM.
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  20. #38
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    Just did another test now, with a load of +-500W: switched off the Mains and the voltage dropped from 54V to 50V within 2 minutes - that's not good, right?
    As Fluffy replied this does not really give an indication. I have had new starting batteries that would settle at 12.5V when new. 3 in a row. I have decided not to buy the same brand again. The last of the 3 was replaced free of charge and the new one settles at 12.7V which I think is more the norm for a new lead acid that is fully charged.

  21. #39
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    Default Re: Lifetime of Victron batteries

    Has anyone here used a Li-Ion battery with an Axpert inverter?
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  22. #40
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    Default Re: Lifetime of Victron batteries

    Quote Originally Posted by Orxy View Post
    Has anyone here used a Li-Ion battery with an Axpert inverter?
    I have not but a friend of mine did. The charger on the Axpert is well suited to lithium but AFAIK it does not have the state of the art comms. You have full control over the various settings when using the USER function instead of a separate settings set for lithium as it has for lead acid / gel / AGM.

    Faniedup is running a few Axperts on lithium.
    Last edited by ekkekan; 2021/06/13 at 02:11 PM.

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