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Author Topic: nursing batteries back to life  (Read 2760 times)
dodgy rog
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« on: September 20, 2008, 12:57:22 PM »

hello please can someone explain how to nurse if possible my two x 24V 240ah forklift batteries back to life, i have had them for about 6months doing nothing not connected to any thing, i know this is bad as they were also secondhand. i have now 960w aray 12xbp 80w, mx60 and vfx3024e also 4.5kw lpg genni, what is my best way forward with these batteries?
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billi
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« Reply #1 on: September 20, 2008, 02:27:27 PM »

Rog

what is the voltage reading ? if you use a multimeter?

Billi
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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
johnrae
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« Reply #2 on: September 20, 2008, 04:16:22 PM »

Are they lead-acid or lead-alkaline batteries.
First thing you need to do is to stop doing nothing - get a charger onto them to stop any self-discharge that may be ongoing.
If lead-acid and they are "flat" and have been for some time then its a surgeon, not a nurse they'll be needing.  The plates will be sulphated which will be a bu**er to remove.  Not impossible but not that easy.
If however they were fully charged when you got them then a reasonable charge rate of about  C/20 ie about 20 amps into each of them won't do them anything but good.

If they're of an alkaline construction then you should have no worries - just get the charger working.

Jack
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dodgy rog
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« Reply #3 on: September 21, 2008, 07:42:51 PM »

hi yeh took reading earlier first batterie 16.8 v second 21.7v, is that bad?
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martin
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« Reply #4 on: September 21, 2008, 09:01:40 PM »

First one dreadful, second one, not that far removed from dreadful! - get them charging by whatever means - and try to get them up to 30 volts plus, and let them have a good "bubble" for an hour or two to try to shift the sulphation! Wink
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Unpaid volunteer administrator and moderator (not employed by Navitron) - Views expressed are my own - curmudgeonly babyboomer! - http://www.farmco.co.uk
dodgy rog
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« Reply #5 on: September 23, 2008, 10:27:39 PM »

thanks, iihave found another batterie perhaps more likely to be good, same thing 24V 450_500ah forklift type, only this reads 24.1 v and its been doing nothing for the same amount of time as the first two?  so i will try to get this one charging, i am waiting for new genni arivving next week i hope, then i guess i can use the inv:charger to charge it
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billi
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« Reply #6 on: September 23, 2008, 10:38:10 PM »

sounds good  still you can wire two 12 volt PV panel to a 24 volt and charge the old battery ...well watch it with the multimeter  Grin

Billi
« Last Edit: September 24, 2008, 08:07:07 AM by billi » Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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