Forum Discussion

Groover's avatar
Groover
Explorer II
Feb 02, 2021

New LiFePo tech?

I noticed several companies are now listing 300+Ah LiFePo batteries in the same size housing and and just a few more pounds than the 200Ah versions. It seems to be so new that no reviews have come in yet that I can find. If anyone can find some reviews on these batteries I would like to see them.

The one that I like best is the Flypower since it is rated for 320A continuously with 640A 3-5sec. I don't think that I would ever need that much but I like having the extra head room.

That one battery would fit in the space of just 3 of my 4 GC2 batteries, give me about 3 times as much energy storage and reduce my weight by around 180lbs. The also claim 1C or 320A charging ability so lots of headroom there too.

The ratings on their batteries that have been out a while seem to be very good.

Flypower 320Ahr
  • StirCrazy's avatar
    StirCrazy
    Moderator
    Feb 03, 2021
    time2roll wrote:
    theoldwizard1 wrote:
    Anyone advertising Ah for a short period is trying to SCAM you !


    Where do you see this?


    the website for the Sio2 lists 2500amps for 5 seconds.

    Steve
  • Itinerant1's avatar
    Itinerant1
    Explorer
    Feb 03, 2021
    StirCrazy wrote:
    pianotuna wrote:
    270Ah 12V Silicon Dioxide Battery 8D Marine & Off-grid $1,237.00

    70 kg (154.5 lbs)

    Max Discharge Current (25°C/77°F) 2500A

    Max Charge Current 65A

    Max Charge Voltage 14.7V

    Dimensions 26.9 x 52 x 23.1 cm (10.59 x 20.47 x 9.09")

    That is in US dollars:


    https://www.azimuthsolarproducts.com/product/12v-270ah-sio2-battery/


    you sure thats 2500 A for a discharge current?
    just looked it up, thats for 5 seconds, whats the max continuious discharge they dont seam to mention that.

    here is a comparason for peoples info if they want to build LiPhO4
    cells off ailibaba 280AH for 561.61 CDN plus you would need to spend about 100 bucks on a BMS and 30 bucks on stuff to make a case.

    weight, 48.5lbs

    Max continuious discharge current 280A

    Max Charge current 280A

    Mac charge voltage 14.6

    Charge temp range -5C to 60C

    Discharge temp -30C to 60C

    size 6.8" x 7.8" x 11.2"

    Steve


    Do you mean LiFePo4 or LFP?
  • BFL13's avatar
    BFL13
    Explorer II
    Feb 03, 2021
    It was amps for a short burst, not AH. See "C-Rates"

    Discharges go with temperature too-see the graphs, and something mysterious about "ratios". Also end voltages.

    Don't know a scenario where an RVer would care about all that, although I got close when I wanted one 100AH batt to run the MW, but didn't care about longer term AH capacity. Had to get a second battery to get more AH. That also reduced the discharge proportion.
    -----------

    Drat! Isn't LFP short for LiFePo4 ?
  • time2roll's avatar
    time2roll
    Nomad
    Feb 03, 2021
    2500 amps for 5 seconds to start a diesel or provide inverter surge performance sounds pretty good.
  • pianotuna's avatar
    pianotuna
    Nomad III
    Feb 03, 2021
    Steve,

    The 100 amp-hour SiO2 can do 240 amps continuous--but that would drain it pretty darn fast.

    I believe the 2500 amps would only be useful with say starting a motor. I can't imagine how a house bank could ever have that high a surge.
  • Groover's avatar
    Groover
    Explorer II
    Feb 03, 2021
    theoldwizard1 wrote:
    200 Ah and 280 Ah prismatic cells have been available direct from China for almost 1 year.

    Anyone advertising Ah for a short period is trying to SCAM you !


    I don't understand what you are trying to say here. It sounds like you have confused Ah(Amp hours) with peak amps. They are not the same thing.

    Also, I am looking at buying these batteries through Amazon. Even if the seller does scam me Amazon has a great return policy and will make things right.
  • Itinerant1's avatar
    Itinerant1
    Explorer
    Feb 03, 2021
    BFL13 wrote:
    It was amps for a short burst, not AH. See "C-Rates"

    Discharges go with temperature too-see the graphs, and something mysterious about "ratios". Also end voltages.

    Don't know a scenario where an RVer would care about all that, although I got close when I wanted one 100AH batt to run the MW, but didn't care about longer term AH capacity. Had to get a second battery to get more AH. That also reduced the discharge proportion.
    -----------

    Drat! Isn't LFP short for LiFePo4 ?


    Yes LFP is short for Lifepo4. He has used LiPhO4 a couple times now and just wondering if it's a new chemistry or something.

    Mine is actually LFMP but just call LFP.
  • StirCrazy's avatar
    StirCrazy
    Moderator
    Feb 03, 2021
    Itinerant1 wrote:


    Do you mean LiFePo4 or LFP?


    there both the same and yes thats what I ment. **** fat fingers forgetting to hit keys LOL

    Steve
  • StirCrazy's avatar
    StirCrazy
    Moderator
    Feb 03, 2021
    pianotuna wrote:
    Steve,

    The 100 amp-hour SiO2 can do 240 amps continuous--but that would drain it pretty darn fast.

    I believe the 2500 amps would only be useful with say starting a motor. I can't imagine how a house bank could ever have that high a surge.


    ok thanks, I couldnt find that anywhere on the one you were posting for. Probabably simular I would figure. as for the 2500 I dont even know if that would be for a starting motor as that would be an awfull short crank for anything needing that kind of starting power with that low of a storage amount. proabably just a test rating to show it could handle it for an extreamly short periof of time with out dammage.

    Steve
  • pianotuna's avatar
    pianotuna
    Nomad III
    Feb 03, 2021
    Steve,

    I don't know if the 270 amp-hour can do 2.7 time the continuous discharge of the 100 amp-hour.

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