If you have a new account but are having problems posting or verifying your account, please email us on [email protected] for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact [email protected]

LiFePO4 vs Lead Acid Efficiency

  • 05-11-2020 6:29pm
    Posts: 5,238 ✭✭✭

    This thread is inspired as a spin off from comments in the Shadey Solar Quotes thread

    Worth a thread of it's Own I expect;

    garo wrote: »
    Your man got 77% efficiency off lead-acid not including inverter losses:

    LiFePO4 losses are less than half that. So your 1>2% number is way off.

    Yer man is not me Garo. Question the methd, test accuracy, hardware and lead health to begin with.

    I've LifePO4 efficiency results of 98% and SLA of ~95% The system efficiency losses are mostly the transformer and mosFETs involved.

    I'll start posting my results as I get them.
    I know right the internet accuses lead as being 80% efficient...I don't know how they're generating results so sell li-ion maybe?. Most of it is unfounded echo chamber.


  • Posts: 5,238 ✭✭✭[Deleted User]

    This is a Yuasa SLA


    Total Effective Capacity (@24V)
    I removed 52.2Ah @ C10



    Returned (including active cooling consumption)

  • Posts: 5,238 ✭✭✭[Deleted User]

    Typical Flooded Lead Acid overcharge expressed as a percentage on the only SOC meter in production that displays >100% Charge (what an invaluable feature)


  • Posts: 5,238 ✭✭✭[Deleted User]


    1.2kVA 1kWh LiFePO4 system round trip


    Charge returned

    of 100Ah removed No photo but this is the battery meter it was read from


  • Posts: 5,238 ✭✭✭[Deleted User]


    That's the state of the Art >€6k 4kVA 3kWh mostly solid state system I was refering to earlier (in other thread)
    System data info not battery. I can rerun the test.

    I have a sister lead version for this that cost me ~€1k; 3.5kVA 10kWh that I'll be running cycle tests on soon so I will post the results when they are in.

  • Posts: 5,238 ✭✭✭[Deleted User]

    garo wrote: »
    LiFePO4 losses are less than half that. So your 1>2% number is way off.

    As with most rebuttals I could simply ask; Have you any evidence to support that?

  • Advertisement
  • Posts: 5,238 ✭✭✭[Deleted User]

    Here's a 1.3kvA 1.1Kwh Lead acid set. Sister to the little LiFePO4 I have.

    You'll notice a higher round trip efficiency I expect.


    Energy Out


    Energy In (test ended at 95% SOC)