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Thread: 100Ah LiFePO4 Lithium Batteries.

  1. #11
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    Do you need to use a special solar controller or 240V charger for lithium batteries?

    I have been told you can use your ordinary charger and controllers but other say this will destroy the batteries???
    Neale


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  2. #12
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    Hi,
    I bought a Fusion Lithium battery on the strength of the technical pdf that said it could be charged by a vehicle alternator or any lead battery charger,
    Having some buyer remorse/anxiety after it arrived, I cut the relevant information to an email to the firm requesting confirmation of this.
    The phoned me advising that "we need to change that" and that I must use a charger with a Lithium charging profile.
    Thus I will need a Lithium DCtoDC charger/solar controller to use it in the camper.
    Cheers

  3. #13
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    It appears that lithium (LiFePO4) batteries last longest if kept between 20% and 80% charge level, unlike lead acid, so leaving them permanently connected to conventional charging equipment is not really a good idea. Ideally you need to monitor amp-hours in and out of your battery so you can see where your state of charge is at because the voltage reading doesn't drop a lot with charge level. I've decided to keep mine in the 13.1 to 13.3V range for now and see how they go at that. If I need them at full charge level I'll plug the panels in and bring them up to around 14V see how many Ah went in, then disconnect and use the charge soonish.

  4. #14
    Join Date
    Jul 2011
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    Quote Originally Posted by austastar View Post
    Hi,
    I bought a Fusion Lithium battery on the strength of the technical pdf that said it could be charged by a vehicle alternator or any lead battery charger,
    Having some buyer remorse/anxiety after it arrived, I cut the relevant information to an email to the firm requesting confirmation of this.
    The phoned me advising that "we need to change that" and that I must use a charger with a Lithium charging profile.
    Thus I will need a Lithium DCtoDC charger/solar controller to use it in the camper.
    Cheers
    I also bought a Fusion battery with same instructions.

    Ive got it installed in my E-Landy to replace SLA , I don't have an alternator but a DC-DC charger that supplies 13.8 v 50Amp when the car is powered on, so its pretty much in float all the time, not good at all for Lithium , but no complaints so far, still performing as advertised 6 months / 3000km later.

    Assuming theres 4 cells in the Battery , nominal voltage is 3.2x4 = 12.8 , fully charged is 3.6x4 = 14.4v so I should be safe at 13.8v and fully discharged is 2.6x4 = 10.4 , the internal BMS should switch the battery off at 10.4 , if a cell goes below 2.5 its cactus.

  5. #15
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    Queensland
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    Optima Yellowtop batteries charge in a very similar way to lithium batteries but do not cause any problems for battery chargers?????

    BTW, thanks to a nice deal with my lithium battery supplier, I am now selling the AMPS 100Ah lithium batteries for $899 retail and $850 for AULRO members.

  6. #16
    Join Date
    May 2013
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    Bittern Vic
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    What charging output is required for the 100 ah Lithium batteries ?
    What output do the dc-dc lithium chargers have ?
    could you put a lithium charger after a normal dc dc charger to modify the charge rate ?

    Ian
    Bittern

  7. #17
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    May 2003
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    what sort of usage makes a battery sit between 80 and 20% charge??
    for that matter,, what sort of charger stops at 80%?

    no float?
    not sure how I could get these to work in the van even if I could afford 3 of them...
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  8. #18
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    Jan 1970
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    Quote Originally Posted by ian4002000 View Post
    What charging output is required for the 100 ah Lithium batteries ?
    What output do the dc-dc lithium chargers have ?
    could you put a lithium charger after a normal dc dc charger to modify the charge rate ?

    Ian
    Bittern
    Hi Ian, and most new DC/DC devices now have a Lithium Battery Charge setting, but even with older devices, if you set it to GEL you can safely charge any lithium battery.


    I am in the process of testing charge cycles using the POWER SUPPLY mode, instead of the charger mode.


    This is based on some very interesting data put out by one the American lithium battery gurus.


    It will take me quite a few weeks to see what the results are and I will post them up here when done.

  9. #19
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    Quote Originally Posted by Pedro_The_Swift View Post
    what sort of usage makes a battery sit between 80 and 20% charge??
    for that matter,, what sort of charger stops at 80%?

    no float?
    not sure how I could get these to work in the van even if I could afford 3 of them...
    Hi Pedro, could you elaborate a little more on your questions?

  10. #20
    Join Date
    Jul 2011
    Location
    Yarrawonga, Vic
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    The inbuilt BMS in a Lithium battery should stop the cells charging when they are full , and should stop them discharging when they are low , The battery does not need float charge so wont accept it.

    IMO no special charger is needed, just hook it up to whatever was charging your old lead battery. no dramas.

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