Inverter batteries - Newest trend?





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  1. #1
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    Default Inverter batteries - Newest trend?

    I have a 6kW inverter and am in need for a new set of batteries.

    Requiring 4 sets of 48V

    What is the best lately?
    - Financial
    - Most charge rates
    - Longevity
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  2. #2
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    Default Re: Inverter batteries - Newest trend?

    Depends if you cycle them every day. If you are completely off grid and cycle the batteries daily you need batteries with higher cycles.

    What make inverter do you have?
    Do you use grid power at all?
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  3. #3
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    Default Re: Inverter batteries - Newest trend?

    Quote Originally Posted by LandyLove View Post
    Depends if you cycle them every day. If you are completely off grid and cycle the batteries daily you need batteries with higher cycles. Agree

    What make inverter do you have? "Current Automation" Oldish unit (running for the last 9 years)
    Do you use grid power at all? Yes. During the day the solar/batteries take over. During overcast the solar panels lack behind, the batteries drain and then the system switch over to grid (on 47V) for 30 mins when the inverter give the batteries a boost and change over to solar/batteries again. At 16h30 the system switch to grid until next morning at 08h30 when the solar takes over again.
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  4. #4
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    Default Re: Inverter batteries - Newest trend?

    Pylontech?

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    Default Re: Inverter batteries - Newest trend?

    Pylontech US3000 (x2) gives you 7kW
    6000 cycles if discharge is set at 20% residual
    Extended warranty on line when registering product.
    Price for 2 - R 40k (approx) delivered with mounting bracket and cables.
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  6. #6
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    Default Re: Inverter batteries - Newest trend?

    Originally Posted by LandyLove
    Depends if you cycle them every day. If you are completely off grid and cycle the batteries daily you need batteries with higher cycles. Agree

    What make inverter do you have? "Current Automation" Oldish unit (running for the last 9 years)
    Do you use grid power at all? Yes. During the day the solar/batteries take over. During overcast the solar panels lack behind, the batteries drain and then the system switch over to grid (on 47V) for 30 mins when the inverter give the batteries a boost and change over to solar/batteries again. At 16h30 the system switch to grid until next morning at 08h30 when the solar takes over again.



    In this case I would recommend to change to Victron Energy, where the Pylontech is fully integrated and remotely accessible for readings, stats and configuration (via Venus GX and WiFi)

    My setup attached
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  7. #7
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    Default Re: Inverter batteries - Newest trend?

    Replacing my inverter is not an option now.

    Which batteries to be recommended otherwise?
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  8. #8

    Default Re: Inverter batteries - Newest trend?

    Quote Originally Posted by JohanMaree View Post
    Replacing my inverter is not an option now.

    Which batteries to be recommended otherwise?
    Li-Ion is the way batteries are going: See:
    https://powerforum.co.za/topic/4519-...es-discussion/
    https://www.economist.com/graphic-de...-battery-power

  9. #9
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    Default Re: Inverter batteries - Newest trend?

    Quote Originally Posted by JohanMaree View Post
    Replacing my inverter is not an option now.

    Which batteries to be recommended otherwise?
    Depends on your budget. I spoke to the guys at Deltec the other day. Li-ion seems to be the one. But at R40k its not cheap. 25 year warranty though....
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  10. #10
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    Default Re: Inverter batteries - Newest trend?

    Tx guys.
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  11. #11
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    Default Re: Inverter batteries - Newest trend?

    I'll be honest, I am sceptical about these claimed lifetimes of Li-ion. Sure, they should last much longer than alternatives and probably are still better value for money in the long run (total cycles x discharge), but I can't see them lasting 20+ years. I suspect what happens is they deteriorate over time and after 20 years might have only like 10% or 20% of their original capacity left. In reality you might want to replace them after 10 or 12 years already.

    We have two Pylontechs. I guess time will tell...
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  12. #12
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    Default Re: Inverter batteries - Newest trend?

    Quote Originally Posted by LandyLove View Post
    Depends on your budget. I spoke to the guys at Deltec the other day. Li-ion seems to be the one. But at R40k its not cheap. 25 year warranty though....
    Spoke to the manager at Deltec Alberton Head office.

    He says they brought in a few samples Li-Ion for testing but is not selling yet. Will happen when they are happy with the results...
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  13. #13
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    Default Re: Inverter batteries - Newest trend?

    Quote Originally Posted by JohanMaree View Post
    Spoke to the manager at Deltec Alberton Head office.

    He says they brought in a few samples Li-Ion for testing but is not selling yet. Will happen when they are happy with the results

    Yes. During the day the solar/batteries take over. During overcast the solar panels lack behind, the batteries drain and then the system switch over to grid (on 47V) for 30 mins when the inverter give the batteries a boost and change over to solar/batteries again. At 16h30 the system switch to grid until next morning at 08h30 when the solar takes over again.

    ...
    Quite a % of energy wasted to top up the batteries from the grid and then discharging them again?? Could you not keep the batteries longer on the low solar??

  14. #14
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    Default Re: Inverter batteries - Newest trend?

    Sounds like you have a serious lack of data, rather spend a bit to rectify that instead of dropping big cash on the wrong solution
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  15. #15
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    Default Re: Inverter batteries - Newest trend?

    Also sitting with a big 7kva UPS in storage that needs batteries, cannot recall but also 36 or 48 7.2v batteries, but with out current inverter the UPS has become obsolete for now.

  16. #16
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    Default Re: Inverter batteries - Newest trend?

    Firstly I need to correct myself.
    - I operate a UPS unit and not an inverter. Apologies.

    Quote Originally Posted by ekkekan View Post
    Quite a % of energy wasted to top up the batteries from the grid and then discharging them again?? Could you not keep the batteries longer on the low solar??
    Not possible to run the batteries longer. At 47V the individual units are already then at 11.75V. Anything under 12V is not healthy. Fortunately the switch over to grid is automatic.


    Quote Originally Posted by Quiksilver View Post
    Sounds like you have a serious lack of data, rather spend a bit to rectify that instead of dropping big cash on the wrong solution
    I am at a total loss here. What "serious lack of data" are you referring to?


    To sum up
    - my system runs very smooth and am quite happy with the setup.
    - The only problem is the battery bank which has come to the end of its lifespan. And what to buy now!

    On Monday I have swopped the FUBAR batteries with one bank (4x12V 150Ah) Trojans from my golfcart and are quite happy with their performance. They last well during loadshedding at average 7A load on the system. Question is how long can these batteries last in this setup as they usually last 3-4 years in the golfcart.

    The pylontech unit is not suitable for my UPS.
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