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Thread: forklift battery 12-85-13 for off grid

  1. #1

    Default forklift battery 12-85-13 for off grid

    No more sam club batteries for me! your right bad idea.

    What about used 12-85-13 forklift batteries 510 AH@ 6hr test or 700AH @ 20hr.
    I would have to use two 24V batterys to make a 48V bank. They come with a 1 year warranty 85% capacity. There only 1000 bucks each. I can allso buy one new 24-85-13 48V battery GB Industrial battery for 4100 bucks. I am thinking of go with the used ones because everyone say I will be hard on my first set of batteries?

    The forklift batterie guys are telling me that the used batteries will last a easy 5 years on a off grid setup?

    So dose anyone use them on here? Is it a bad Idea?

    The guy at GB sayed they only last 2000 gas cycles and it dose not matter if it 80% 0r 20% doc he sayed a gas cycle is a gas cycle is there a truth to this ?

    Thank for any help

  2. #2
    Join Date
    May 2006
    Location
    Florida, USA
    Posts
    1,273

    Default Re: forklift battery 12-85-13 for off grid

    Forklift batteries are very rugged. They do have a higher leakage rate then other deep cycle batteries.

  3. #3
    Join Date
    Aug 2008
    Location
    North Arkansas
    Posts
    101

    Default Re: forklift battery 12-85-13 for off grid

    I installed 2 sets of Exide Load Hogs, the first 12 yrs. ago and the second 10 yrs. ago. Both are doing fine. Neither has been abused but cycled about 20% several times a week. Both owners love their batteries and would buy them again.

  4. #4

    Default Re: forklift battery 12-85-13 for off grid

    I'm not sure what he's refering to as a "gas cycle".

    From what I've read they have a bit more self discharge 1-2% a week?(month?) and they need to be equalized every month.

    I beleive someone who frequents this forum has a 20 year old one and reports of 30+ year old on another forum (and survival web site here touted a 30+ year old forklift battery; http://www.survivalunlimited.com/bat...ryblunders.htm ) i couldn't find it at their web site, it's pretty homemade with menus not up dated so perhaps you can find info about them, or Email directly or call about their experiences)

    Edit - found a direct link about half way down under Battery Tales; http://www.survivalunlimited.com/eag...indturbine.htm

    For 4100 for new vs 2000 for rebuilt... I'd have to go new, I think 24 volt 635 ah was in the $2800-3100 price range for new, so it sounds like a pretty good deal as well!
    Last edited by Photowhit; August 23rd, 2010 at 19:25 PDT.
    Home system- 20 - 200W Evergreen blems, 2 Classic Lites, E-Panel, 2 Prosine 1800 watt inverters, 800AH 24V forklift Batt, up and running 1 Classic Lite and 14 Suntech 185W in spare room.
    Experience with Pulse/Trace PC250 Power Center, Original Rouge CC, 80-4/5watt 6v panels, Odds and extras,

  5. #5

    Default Re: forklift battery 12-85-13 for off grid

    The cycle is counted as a complete discharge-charge cycle. So if you discharge down to 50%, you'd need to do it twice to get 1 cycle.

    The battery life is dramatically affected by how deeply you discharge it. See the Battery FAQ section here: http://www.windsun.com/Batteries/Battery_FAQ.htm#Cycles vs Life

    There are 2 accessory items for forklift batts that could be worth investigating:
    - Airlift systems. These are called by various names, basically it's a small air pump that pumps air into the bottom of each cell during the charge cycle. According to most manufacturers this can lead to a 10% improvement in charging efficiency and a reduced battery temperature (= longer life). Additionally, it negates the need to do equalisation as often because it mixes up the electrolyte during every charge cycle. Example: http://www.hoppecke.com/products/app...cks/trak_r_air

    - Central filling systems. This is basically a system of tubes attached to the cells that lets you fill them from a central point, so that you don't have to add electrolyte to 24 individual cells.

    I'd go with the new cells too. Unless you know the complete history of how the used batts were used, discharged and charged it'll be a gamble - and the difference in price isn't worth it.

  6. #6
    Join Date
    Sep 2007
    Location
    Fox, Arkansas
    Posts
    383

    Default Re: forklift battery 12-85-13 for off grid

    So dose anyone use them on here?
    I have a set of 6-100-13 Deka fork lift batteries (24 volt system 940 amp hour) that I use for my emergency backup system. They work flawlessly but do not get discharged but a few times a year. I am told in this situation it is wise to actually exercise the battery about every 4 months by drawing them down below 50% DOD and then do a full recharge. In the summers they need to be topped with water and eq'ed monthly. Their float current runs around 2-3 amps during sun hours but float is turned off at night. I do a bulk each morning for 30 minutes before the sw4024 goes into sell mode. On average it takes more than 300 watts just to maintain this battery each day. AGM's would be a better choice for my situation if money were no problem.
    15 assorted solar panels 1800 watts
    MX 60 charge controller
    940 amp hour 2 X 6-100-13 DEKA batterys
    TriMetric battery monitor
    SW4024 inverter
    Basic Stamp computer to control SW4024 from MX60

    MikeO

  7. #7

    Default Re: forklift battery 12-85-13 for off grid

    One downside to forklift batteries that hasn't been mentioned: they tend towards "monolithic". For some of 'em you need a forklift to move the battery!

    So be sure and check for space and weight capacity as well as accessibility before going this route.
    1220 Watts of PV, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.

    Ohm's Law: Amps = Volts / Ohms
    Power Formula: Watts = Volts * Amps

  8. #8

    Default Re: forklift battery 12-85-13 for off grid

    Ok I will go with the new 24-85-13 GB they come with a 5-Year Warranty and 100% made in the usa. $4,111 right to my door is a sweet deal!

    what do you guy think of this gizmo?
    http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT


    looks like a good idea to me!

    Thanks for all your help..


  9. #9
    Join Date
    Mar 2009
    Location
    Los Angeles, Ca.
    Posts
    1,332

    Default Re: forklift battery 12-85-13 for off grid

    Quote Originally Posted by myhouse07 View Post
    Ok I will go with the new 24-85-13 GB they come with a 5-Year Warranty and 100% made in the usa. $4,111 right to my door is a sweet deal!

    what do you guy think of this gizmo?
    http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT


    looks like a good idea to me!

    Thanks for all your help..

    I wouldn't. 40 bucks just to monitor one cell? How many cells will you have? Different cells don't always use the same amount of water. Mark I Eyeball is a better tool I think.

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