navitron
 
Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address. Following continuous spam/hack attempts on the forum, "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
 
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: testing new second hand batteries.  (Read 1805 times)
offthegridandy
Hero Member
*****
Offline Offline

Posts: 1013



« on: January 16, 2012, 05:23:46 PM »

Help and advice please.

I've just been offered a set of "recon" batteries. 24 volt lead acid fork lift type. 1000 AHr. Seller claims they are new set that ain't been used, just kept on standby. Set is in cage with straps and is "wet and charged" priced at 1150.  If they are new its seems a good price.

Question is what is best way to test the set to be sure they are as stated?

Undo the straps and check voltage on each cell is same/similar is my starting point. Any other thoughts comments welcomed

Andy
Logged

8 KVA Lister TS2 Startamatic Genny
24 Volt 1000amp battery bank
Outback VFX3024
4.6 Kw PV array ground mounted
Outback Flexmax 80
2 X Flexmax 30 PV CC
2.5 Kw WT H Piggot design 4.5 Mtr Dia AC coupled
12 Mtr free standing Tower.
u/floor heating from oil boiler cross linked to 12 K wood stove
camillitech
Hero Member
*****
Offline Offline

Posts: 5487



WWW
« Reply #1 on: January 16, 2012, 05:47:08 PM »

Hi Andy,

check the SG's and make sure they are all the same, have a good squint down the filler hole and look for plate separation, check the underside of each cap to ensure they all look the same. There will be 'soot' for want of a better word under them and it should be the same amount on each cell. Actually if they are new then there should be nothing under them as they won't have been cycled, or so he says.

Check all the markings, numbers and dates to ensure they're all the same age/batch and then 'Google' for proper specs.

Personally I wouldn't go near a second hand battery bank but plenty of folk have had good luck on that score and others have had more bother with new ones. However at that price, even I'd be tempted  Grin

Sure I've missed something out but someone who actually knows what they're talking about will be along shortly  Grin

Good luck, paul
Logged

http://lifeattheendoftheroad.wordpress.com/

'Off grid' since 1985,  Proven 2.5kW, Proven 6kW direct heating, SMA SI6.OH, 800ah Rolls, 9kW PV ,4xTS45, Lister HR2 12kW, , Powerspout pelton, Stream Engine turgo, 60 x Navitron toobs and a 1500lt store. Outback VFX3048 and 950ah forklifts for backup,
rogeriko
Hero Member
*****
Offline Offline

Posts: 1451



WWW
« Reply #2 on: January 16, 2012, 06:22:51 PM »

You need one of these. Check the voltage of each cell under load, this tester draws 200A I use a digital tester to measure the volts per cell exactly while I discharge each cell for about 30 seconds. Shouldnt drop below 2v-2.1v. Plus measure acid with hygrometer.


* 2v tester.jpg (37.42 KB, 500x895 - viewed 277 times.)
Logged

clockmanFR
Hero Member
*****
Offline Offline

Posts: 3584



WWW
« Reply #3 on: January 16, 2012, 07:34:56 PM »

Hers a trick i use.

I go look at them and test each cell with a digital read out to allot of decimal places. I ask them to take them off charge and then read every one, right details down, i then say oh yes they seem okay just popping to the bank or lunch or something but leave them for an hour or two, off charge, then use the gadget, (rogeriko shows) or load, for an exact time for each cell on your return and test the voltage against your original test readings. You should see that they all have dropped but the drop should be the same, but bad cells will show up.
 Get the chap to do it with you, its surprising the look on their faces when you get the meter out.

I have said several times to folk that i will not take that 'one' its showing a bad test result.
Logged

Everything is possible, just give me TIME.
offthegridandy
Hero Member
*****
Offline Offline

Posts: 1013



« Reply #4 on: January 16, 2012, 08:30:25 PM »

Thank you

Paul,Roderico and Clockman. I can check SG no prob. I'll have to see if I can borrow a voltmeter or look on flea bay.  Thank you for your advice.

Andy
Logged

8 KVA Lister TS2 Startamatic Genny
24 Volt 1000amp battery bank
Outback VFX3024
4.6 Kw PV array ground mounted
Outback Flexmax 80
2 X Flexmax 30 PV CC
2.5 Kw WT H Piggot design 4.5 Mtr Dia AC coupled
12 Mtr free standing Tower.
u/floor heating from oil boiler cross linked to 12 K wood stove
Justme
Hero Member
*****
Offline Offline

Posts: 3575


« Reply #5 on: January 16, 2012, 10:43:16 PM »

Dont pay more than the scrap value for second hand cells.

If they have been on float then they have been used.

Check the date codes.

My first bank that is still going strong (3 years) cost 130 inc del for 1550ah @12v its upgrade cost 450 for 2800ah @12v. I am now keeping the smaller bank on float till the bigger one has been cycled for enough times for me to be confident on joining them with no issues.
Logged

Navitron solar thermal system
30 x 58mm panel 259L TS
1200watts solar 120vdc
FX80 Solar controller
2 x Victron Multiplus II 48/5000/70
Cerbo GX & GX 50 touch
BMV 700
6kva genny
48v 1000ah
Grid Possibly coming soon
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!