Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 28

Thread: Deep Cycle AGM Batteries

  1. #11
    Join Date
    Oct 2007
    Location
    Brisbane West
    Posts
    7,274
    Total Downloaded
    0
    Yep that weight saving is fantastic. Once my Giant in the boat wears out I will go the same way...might have come down more in price too by then! Cheers

  2. #12
    Join Date
    May 2007
    Location
    Melbourne
    Posts
    1,532
    Total Downloaded
    0
    Thanks team

    I started to look at Lithium but I think it's cost prohibitive?

  3. #13
    DiscoMick Guest
    Quote Originally Posted by land864 View Post
    Thanks team

    I started to look at Lithium but I think it's cost prohibitive?
    Were the lithiums about twice the price of AGMs? It's coming down.

  4. #14
    Tombie Guest
    Quote Originally Posted by DiscoMick View Post
    Were the lithiums about twice the price of AGMs? It's coming down.
    It’s the extra costs. BMS etc that also add to the change over.

  5. #15
    Join Date
    May 2007
    Location
    Melbourne
    Posts
    1,532
    Total Downloaded
    0
    About that from what I've read

  6. #16
    Join Date
    Feb 2013
    Location
    Perth, Western Australia
    Posts
    80
    Total Downloaded
    0
    Quote Originally Posted by Tombie View Post
    It’s the extra costs. BMS etc that also add to the change over.
    You don't need a BMS for a 12V LiFePO4 battery. They are sealed units of 4 cells with internal cell management.

    They are a direct drop in replacement for lead acid, although not usually for starting.

    They are definitely expensive though. The capacity is cheaper if you get individual cells, but you need to pay extra for cell management on top.

    Edit, it should be noted though that with AGM batteries, you can only use about 30% of the capacity if you want the battery to last its maximum cycle life. You can draw down on a LiFePO4 battery much deeper and it holds a constant voltage for much longer so you cannot compare the Ah ratings apples to apples. You can almost got away with half the capacity you would require for a properly rated AGM system. If you take this into account, the lithium batteries do actually stack up quite well.

  7. #17
    Tombie Guest
    Exactly! And why it’s working out for my to change.

    I have a Victron charging and Solar system already.

    Add to that dropping the 2x80ah AGMs for a single 125ah LiFePO4 gives me more capacity, less weight and better overall performance.

  8. #18
    Join Date
    Oct 2007
    Location
    Brisbane West
    Posts
    7,274
    Total Downloaded
    0
    I'm happy enough to draw down 50% (but not lower) on my cheapie 130amp. I reckon on still getting 700-1000 cycles. Given it's an electric trolling motor and is used once every few weeks that's a cheap way of getting a great couple of days on the water before a charge. Cheers

  9. #19
    Join Date
    Feb 2013
    Location
    Perth, Western Australia
    Posts
    80
    Total Downloaded
    0
    Quote Originally Posted by ozscott View Post
    I'm happy enough to draw down 50% (but not lower) on my cheapie 130amp. I reckon on still getting 700-1000 cycles. Given it's an electric trolling motor and is used once every few weeks that's a cheap way of getting a great couple of days on the water before a charge. Cheers
    500 cycles sounds more realistic I would say. The battery would still work after 500 cycles but it may not be fit for that purpose anymore. Still a lot of weekends though!

    The advantage of lithium is it would be lighter, take up less space and have less voltage drop so you will probably get better performance from your motor. It will last a lot more cycles too. If you are on a budget though, AGM gets the job done.

  10. #20
    Join Date
    Oct 2007
    Location
    Brisbane West
    Posts
    7,274
    Total Downloaded
    0
    Yep probably right. 20 years for 25 charges a year but that's all theoretical but if i get 10 years giddy up.$20 odd per year...

    Cheers

Page 2 of 3 FirstFirst 123 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!