Lithium batteries, what is the current thinking.

soloronesolorone Solar Expert Posts: 254 ✭✭✭
No I  do not have lithium, missed that boat on my last rebuild.  I have an acquaintance who is wanting a 200 Amp Lithium battery, she us conversing on a Facebook group.  For my info , has Lithium reached  practical  use ?  Are there other suggestions in place of, other than FLA, which is all I know.  To me AGM still has a bad buzz, opinions  from serious users  are welcome. Thanks,  cheers.

Comments

  • westbranchwestbranch Solar Expert Posts: 5,182 ✭✭✭✭
    edited November 2018 #2
    what are the parameters of use?  boat? stationary?  Experience of user? what make is being considered? Loads? etc etc...
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • mcgivormcgivor Solar Expert Posts: 3,274 ✭✭✭✭✭

    @solorone said, For my info , has Lithium reached  practice  use ? 

    Amidst a sea of negative opinions, perhaps based on misinformation and hearsay,  I made the decision to switch to LFP  and will never look back to iead acid. A vast majority of negative comments are based on the single word Lithium, which encompasses a range if differing chemistries, some of which can be extremely dangerous if not treated with extreme caution, while some Lifepo4 for example are much safer.

    No battery is absolutely safe, including the stalwarts of the industry, however with Lifepo4  care is needed  to ensure operating within safe parameters this is mostly done with electronic protection wether by voltage limitations on charging/dischargeing or through the use of a battery monitoring system or BMS to take care of the control.

    Having a strong electrical  background  is needed,  particularly with a DIY bank, less so perhaps with drop in replacement types which have an on board BMS to protect itself though they have their limitations, they cannot be connected in series for example to achieve higher voltage. No personal experience with this type.

    The direct advantages in my experience are as follows. They are able to accept higher charge current without the need for long absorption resulting in better efficiency especially with generator charging . High discharge current without excessive volt drop,.  Low temperature gain, when charging and ability to operate at higher temperatures, within reason. The  ability to discharge to a much lower state of charge, no need to fully charge as needed bu LA to prevent sulfation, no watering as with FLA  (not applicable to AGM )  higher cycle potential especially when lightly used.

    Other possible advantages,  higher energy density, resulting low weight and physical size, particularly useful in mobile applications.

    Disadvantages, cannot be used in temperatures below 0°C. More  electronics adds to complexity in most cases. Higher initial cost, which is subjective if the  life expectancy is longer and the need for a lower overall Ah capacity is possible.

    These are my views and opinions, others may differ..........There are others using LFP, please share your experiences.


    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
  • soloronesolorone Solar Expert Posts: 254 ✭✭✭
    Experience,, 3 years learning.

    Use,,,  is small home where they have been  3 years.

    Lower, starting out gear.  2000 W inverter  and  I think  maybe a PWM CC.

    For now I do not want to really stay with the battery  ?? and we will assume light loads, maybe a gravity water pump booster and good solar.  With  now failing  AGMs, she just  needs to replace batteries, trying make a wise choice, I offered to help. 
  • westbranchwestbranch Solar Expert Posts: 5,182 ✭✭✭✭
    what caused the failure within 3 years?  As we all know the first batt. sets are  murdered... or was it too much discharging or too little PV to properly recharge the bank or too high a charging voltage, AGMs are particularly sensitive to too hi a charge V setting , ......
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
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