Compare Crown 2CRP1400 and Trojan L16H batteries

kevinjones
kevinjones Registered Users Posts: 34 ✭✭
in Off Grid Solar & Battery Systems #1
Hello,

I have been using Trojan L16H batteries and am considering switching to 2V.  In comparing Crown 2CRP1400 and Trojan L16H, I find the following:

Crown 2CRP1400 - 1000Ah @ 100 hours
Trojan L16H - 483Ah @ 100 hours

Now when I compare the physical characteristics:

Crown 2CRP1400 - 7.56 × 6.56 × 25.75 - 1016 sq-in* - 136lbs
Trojan L16H - 11.66 x 6.94 x 17.55 - 1118 sq-in* - 125lbs

(approximate volume of the battery itself based on the assumption of outside width - .5", outside depth - .5", outside height - 2")

My old-school understanding of amp-hour capacity of lead-acid batteries is that it is very dependent on the density of the plates.  Yet when comparing the Crown 2V which is rated at more than twice the capacity of the Trojan 6V, there is very little difference in weight and volume, which translates to me plate density.

Is there something I am not understanding about the theory of this?

Thanks,
Kevin



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Comments

  • Vic
    Vic Solar Expert Posts: 3,208 ✭✭✭✭
    #2

    Hi Kevin,  just a quick comment;

    The Crown 2CRP1400 IS Rated at 1000 Ah,   but at the 20-hour Rate  --  1400 Ah,  at the 100 hr Rate.

    Taking a simple ratio of the Ah Capacity,  verses stated wet-weight,  it looks like the 2V battery has close to three times the Capacity of the Trojan 6 V battery.

    Will look,  now,  but believe that the Trojan L-16H might be in the Floor-Scrubber class of battery   ...   for ALL that this may mean.

    More later,   Vic

    Off Grid - Two systems -- 4 SW+ 5548 Inverters, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 4X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  25 KVA Polyphase Kubota diesel,  Honda Eu6500isa,  Eu3000is-es, Eu2000,  Eu1000 gensets.  Thanks Wind-Sun for this great Forum.
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  • kevinjones
    kevinjones Registered Users Posts: 34 ✭✭
    #3
    Well, now that I think about it, since 3 2V 1400Ah batteries in series would equal 1 6V 1400Ah, well that would be 3x the weight, so (duh) 3x Ah, 3x weight.

    Factoring in the voltage, they actually come out to about the same capacity, and similar weight and volume.

    Considering this, it looks like the Crowns would be way more expensive to supply the same capacity:

    3 x 6V L16s in parallel = 1449Ah @ 100hrs - $250 ea
    3 x 2V 2CRP1400s in series = 1400Ah @ 100hrs - $625 ea

    bank of 24 L16s wired for 12V ( 2 series x 12 parallel) - 483Ah x 12 = 5796Ah - ~ $250 x 24 = $6000
    bank of 24 2CRP1400s wired for 12V (6 series x 4 parallel) - 1400Ah x 5 = 5600Ah - ~ $625 x 24 = $15000



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  • kevinjones
    kevinjones Registered Users Posts: 34 ✭✭
    #4
    "Considering this, it looks like the Crowns would be way more expensive to supply the same capacity:"

    After being enlightened on terminology on another thread, that should read:

    Considering this, it looks like the Crowns would be way more expensive to supply the same energy:

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  • Vic
    Vic Solar Expert Posts: 3,208 ✭✭✭✭
    #5

    Hi again,   Kevin ...   BTW,   welcome to the Forum.

    First,   IMO,  the Trojan batteries appear to have their primary design goal,   of being inexpensive.   So,  their cycle-life would be expected to be considerably shorter that would be the Crown,   which is in the category of an Industrial battery.

    It is probably to look at the amount of energy storage that you need to support your LOADs.

    It is not a good design practice to run multiple battery strings.  Four parallel strings if not a very good design,  IMO.

    TWELVE parallel strings,   is simply nuts!

    If you need to store this amount of energy,  then,  certainly,  you will want a 48 volt battery on the system.

    But,   a good design practice is to start with the loads that the battery will need to supply,   the time of day that these loads occur,  and also the peak load on the system.

    Then you can look at how the battery will be recharged,   and what will be needed to do that.

    More later,    just to try to get things started.   Vic

    Off Grid - Two systems -- 4 SW+ 5548 Inverters, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 4X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  25 KVA Polyphase Kubota diesel,  Honda Eu6500isa,  Eu3000is-es, Eu2000,  Eu1000 gensets.  Thanks Wind-Sun for this great Forum.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #6
    kevinjones said:
    Well, now that I think about it, since 3 2V 1400Ah batteries in series would equal 1 6V 1400Ah, well that would be 3x the weight, so (duh) 3x Ah, 3x weight.

    Factoring in the voltage, they actually come out to about the same capacity, and similar weight and volume.

    Considering this, it looks like the Crowns would be way more expensive to supply the same capacity:

    3 x 6V L16s in parallel = 1449Ah @ 100hrs - $250 ea
    3 x 2V 2CRP1400s in series = 1400Ah @ 100hrs - $625 ea

    bank of 24 L16s wired for 12V ( 2 series x 12 parallel) - 483Ah x 12 = 5796Ah - ~ $250 x 24 = $6000
    bank of 24 2CRP1400s wired for 12V (6 series x 4 parallel) - 1400Ah x 5 = 5600Ah - ~ $625 x 24 = $15000



    As Vic said, this is a very odd bank with that much capacity @12v.  Maybe there's an application where it makes sense, but I can't think of one offhand.

    As an aside, you may also want to consider the maintenance aspect.  6v L16s are 3x2v cells connected in series, so your bank would be 3x24=72 cells to check SG and water.
    2v would be 24 cells


    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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