Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 32

Thread: 100Ah LiFePO4 Lithium Batteries.

  1. #21
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,791
    Quote Originally Posted by goingbush View Post
    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.
    Hi goingbush, unfortunately itís not quite that simple.

    First off, you need to make sure the battery charger setting does not allow the chargerís voltage to rise above 14.8v, which they can do, when charging wet cell batteries.

    If the voltage rises above 14.8v, the lithium batteryís BMS will shutdown, and the battery will not charge. No harm done, but the battery may take quite a long time to charge.

    Another more common problem with lithium battery BMS operation is that if the battery is discharged low enough for the BMS to shutdown and there is no voltage at the battery terminals, there is now a problem that most battery chargers need a minimum of 7v volts at the battery or the battery charge will not start charging.

    By using a battery charger in power supply mode, both of these problems are avoided.

  2. #22
    Join Date
    May 2013
    Location
    Bittern Vic
    Posts
    324
    Quote Originally Posted by drivesafe View Post
    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.

    The dc dc charger i have is automatic. Which battery do you think it would select ?

    Ian Bittern

  3. #23
    Join Date
    Jul 2011
    Location
    Yarrawonga, Vic
    Posts
    5,604
    Recently purchased one 12v 100Ah LFP battery from Drivesafe for my caravan , to replace two x 120Ah AGM ,

    that one 15kg LFP battery is far outperforming the 2 x 40 kg AGM's prev installed in the van ( Albeit they are 4 years old) . I have 2 x 230w Panels , a Ctek charger in "Supply Mode" and a Victron MPPT 100/50 solar charger . The lowest the battery has got to so far is 13.2V after a night camping ( Compressor fridge) , the pair of AGM's would often drop to 11.4 volts.

    We have ordered a new bigger Van , it will have 3 x Panels & I've told the manufacturer I'll be supplying my own Lithium batteries & they will install the appropriate charger, so Tim , I'll be placing an order for another of your 12v LFP when we get home.

  4. #24
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
    Join Date
    Aug 2010
    Location
    Sunbury, VIC
    Posts
    16,531
    I'm really thinking I need to get one myself. I could save a lot of weight in my van - enough to put a second decent water tank in for my shower which I would like to do...

    Tim - look out for a PM from me.


    1977 101 FC - 'Chucky'
    1986 Classic RR - 'Thing'
    1976 Series III Tray
    1997 Honda CBR1000F
    2003 L322 - Gone to a new home.

    'Love with your heart - use your head for everything else.' - CaptainDisillusion

  5. #25
    Join Date
    Jul 2011
    Location
    Yarrawonga, Vic
    Posts
    5,604
    Quote Originally Posted by Homestar View Post
    I'm really thinking I need to get one myself. I could save a lot of weight in my van - enough to put a second decent water tank in for my shower which I would like to do...

    Tim - look out for a PM from me.
    The weight saving was the impetus for me , as I weighed my van pre trip and it was over weight .
    Removing those AGM's and replacing with Lithium bought it back under the limit , Then I removed other useless crap such as extra jerry cans & holders to give me back some tare to carry a change of socks & undies.

    but the performance gains are outstanding & more worth the change for that.

  6. #26
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
    Join Date
    Aug 2010
    Location
    Sunbury, VIC
    Posts
    16,531
    Thanks, I'm not overweight with mine but close and no room to add anything else. I run 4 x 100Ah AGM's so about 120Kg in batteries. I may need 2 lithium units to replace those but I'll start with one - it may be more than enough for my needs. 100Ah LiFePO4 Lithium Batteries.


    1977 101 FC - 'Chucky'
    1986 Classic RR - 'Thing'
    1976 Series III Tray
    1997 Honda CBR1000F
    2003 L322 - Gone to a new home.

    'Love with your heart - use your head for everything else.' - CaptainDisillusion

  7. #27
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,791
    Hi Homestar, and if you donít mind, I will answer your questions here so others will gain from the same info.

    I have also been watching the sales of new low price lithium batteries. At first I thought those batteries were going to be a threat as the supplier of my batteries could not complete with these new low prices.

    After a number of conversations with them I realise the batteries are not going to be much of a competition as they have some serious drawbacks and limitations and already a couple company selling them are no longer around.

    Some things to watch out for when looking at some of those batteries is not so much the low price but the low specs such as maximum charge current maximum discharge currents and see if you can get full spec details on the batteries.

    One of the suppliers has continuously changed the data about their batteries to the point where no one really knows what the is real and what is fake about their batteries.


    The chart below shows the specs for the AMPS 100Ah batteries and I will explains their characteristics in more detail later in the post.

    Lithium Data Charts.jpg



    Also, here is a bit of an update on my testing of AMPS 100Ah Lithium batteries.

    I have been carrying out some charge and discharge tests on the AMPS 100Ah Lithium batteries and found they have got some pretty good operating properties so far as capacity and charging is concerned.

    Batteries can be fully charged with a voltage as low as 13.7v and while at this voltage level the batteries will take slightly longer to fully charged than at the maximum of 14.6v, the low voltage will help to extend the operating lifespan of these batteries.

    The two different continuous discharge currents can be a bit confusing, but they relate to 2 different operational uses of the batteries.

    The lower 100 amp continuous discharge current rate relates to the use of the batteries in remote area situations where they are cycled every day from discharge overnight to charging during the day.

    The higher 160 amp continuous discharge current rate is for RV use, where the battery will see hard use for a few days at a time and then no use for weeks or months at a time.

    Charging current rates are on a similar line, 20 amp charging will optimise lifespan for batteries in 24 hour continuous use, while 40 to 60 amp periodical charging will be acceptable practice in RV use.

    Homestar, I spoke to the supplier about 14.7v charging and he thinks that's while its just a tad too high for continually charging, but should be fine in the short period until you change solar regulators.

    Starting with one Lithium battery is a good idea, as based on your own use, may be all you need, but it is a simple job to add another one later if required.

  8. #28
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
    Join Date
    Aug 2010
    Location
    Sunbury, VIC
    Posts
    16,531
    Thanks for that - I'm due to lash out on a new MPPT controller so will do that at the same time. I'll find one with a suitable max voltage.

    Cheers.


    1977 101 FC - 'Chucky'
    1986 Classic RR - 'Thing'
    1976 Series III Tray
    1997 Honda CBR1000F
    2003 L322 - Gone to a new home.

    'Love with your heart - use your head for everything else.' - CaptainDisillusion

  9. #29
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,791
    Quote Originally Posted by Homestar View Post
    I'm due to lash out on a new MPPT controller so will do that at the same time. I'll find one with a suitable max voltage.
    Just a suggestion, try to get a solar regulator with some form of adjustable output control.

    This would allow you to charge your batteries at the optimum charge voltage based on your own type of usage.

  10. #30
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
    Join Date
    Aug 2010
    Location
    Sunbury, VIC
    Posts
    16,531
    Thanks - I was going to grab a Victron 100/50 unit which has a default setting of 14.4 volts for absorption and 13.8 volts for float - I believe these are adjustable setpoints too. I haven't heard a bad word about the Victron units and I'm happy to spend the dollars if it will help look after an expensive battery.


    1977 101 FC - 'Chucky'
    1986 Classic RR - 'Thing'
    1976 Series III Tray
    1997 Honda CBR1000F
    2003 L322 - Gone to a new home.

    'Love with your heart - use your head for everything else.' - CaptainDisillusion

Page 3 of 4 FirstFirst 1234 LastLast

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!