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Author Topic: Forklift batteries and charger  (Read 8809 times)
baker
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« Reply #30 on: August 04, 2014, 09:52:21 AM »

biff/clockman
what I have done
the ups is pluged into the main grid and charging the internal battery and the battery bank hopefully
  
will have a look tmro
for now I have put what I have around
2 fuse carrers and 2 x 10amp fuses extra long on the strings between the battery bank and the ups
from the ups  3amp fuse  for the 16x240v x 9w low energy  pull 150 watts
the battery bank was at 53v before  connected
each battery 13.1 volts x 16
will I get a volt  and amp meter on the bank? to see
any ideas welcome
baker

baker

 
 
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baker
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« Reply #31 on: August 05, 2014, 09:53:18 PM »

I plugged the ups in
and only last battery   led on after a hour use
with the battery bank connected? banghead

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biff
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« Reply #32 on: August 05, 2014, 10:37:23 PM »

Hi baker,
        Your UPS will never charge your battery bank. I thought you had pv to do the charging, ?
    The UPS will not give you the correct reading for SOC on the bank either.
  You need to get your batteries charged up as soon as possible,
                                            Biff
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baker
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« Reply #33 on: August 10, 2014, 10:59:55 AM »

Biff
Was planning to charge the bank  150 ah @ 48v
From the grid  via the ups charger
Any ideas
Help
Baker
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biff
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« Reply #34 on: August 10, 2014, 11:11:05 AM »

Good morning Baker,
                You would need an ups the size of a forklift charger (washing machine) to charge your forklift battery. It would not even tickle your forklift batteries.
   Lay your hands on 2 PV panels 165watt vmp of 30v + and take it from there.
  Like Rogerico says you can dump the PV straight into the 48v pack.hopefully your pack is a nice 600ah or more. The UPS is designed to charge only small 7ah packs any bigger and they would be quite dangerous.
             Biff
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baker
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« Reply #35 on: August 13, 2014, 08:09:18 AM »

Biff
Could a scotter 240v     48v /20amp charger
Trickle charge the bank in  a day
Baker
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biff
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« Reply #36 on: August 13, 2014, 09:26:01 AM »

Hi Baker,
         Just connect up and then you will know. To be honest a 48v x 20amp charger would be a valuable asset.
  The length of time it takes and the success of the charging depends on how low the batteries have been hammered.
   Your 20amp charger should have no trouble with the 150ah bank, I am guessing that you have 2 strings of 75ah batts. (8 remaining batts in total)
   You need to charge each string seperately,let the charger take them up to the top one string at a time,let them sit overnight
    Place the volt meter on each 75ah unit and take a reading.You need to get the batteries to the same level of charge because
   they will disagree and pull one another down if they are not up to the same level of power.This could mean splitting the strings
   and matching the batteries again to form strings that will performing properly. Of course it will be at the expense of the weaker batteries
    but you have no choice if you want it to work reliably.
                                              Biff
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baker
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« Reply #37 on: August 19, 2014, 03:25:40 PM »

skiped the ups,s surrender
total waste of time ,unable to charge a battery bank,
beeping  fans running, pulling 200w banghead


12v   3000w x 20amp inverter charger
baker



 
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biff
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« Reply #38 on: August 19, 2014, 05:54:15 PM »

Hi Baker,
        Not a total waste of time. You have had the experience and now you can see exactly what it does. It is a pity you skiped the UPS,
            You will always find someone looking for a 48volt 3000va job
                                                                       Biff
         
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baker
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« Reply #39 on: January 20, 2015, 07:47:40 PM »

 Help
 I have but 4 sealed lead acid batteries 12v@40amp x 4 =160amp    /  4 panels@ 120w of pv
 for a small micro system
 set the solar charge controller 14 4 volt cut off
 at the end of the day it says 99% for battery condition
 when I run  3 amp 12 fan  the battery drops down to 64%
 and after a hour I switch off and battery goes up to 70%
 the question is, what do you think  are the batteries ok
 if I have a load of 30 amps per day
 what amount of batteries 40amp batteries would I need to keep going
 baker
 
 
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baker
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« Reply #40 on: January 20, 2015, 10:58:14 PM »

now 75% battery condition
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Scruff
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« Reply #41 on: January 20, 2015, 11:08:13 PM »

at the end of the day it says 99% for battery condition
 when I run  3 amp 12 fan  the battery drops down to 64%
 and after a hour I switch off and battery goes up to 70%

That's not a real SOC meter. Sounds to me like it's just a fancified voltmeter. I don't trust it. I reckon the 99% charge it's reading is the voltmeter's interpretation of surface charge. I reckon they're undercharged. 120W PV total or 480W?
 
the question is, what do you think  are the batteries ok

They sound like they are struggling. Couldn't say without a specific gravity test. Charger fidelity testing (when the charger tells you it's fully charged are the batteries really fully charged?) and a controlled discharge test to 50% DOD at C20.
 
if I have a load of 30 amps per day
 what amount of batteries 40amp batteries would I need to keep going


If you can replace 36Ah per day then, maybe three or more 40Ah jobbies...the more you add the longer they last and the more they'll give due to reduced discharge curve. So twice the bank size is often ~3 times the power with the same discharge curve.
If you can't replace 36Ah a day then I'd work to a weekly figure as they'll need to be fully charged weekly for maintenance.

I'd also aim to have an absolute minimum discharge cycle depth of 5% preferably 10% for chemistry reasons.
 
« Last Edit: January 20, 2015, 11:17:56 PM by Scruff » Logged
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