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Battery question not aeroplan related

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glastar(at)gmx.net
Guest

Posted: Thu Jul 12, 2012 7:48 am Post subject: Battery question not aeroplan related

Hello Bob and all,



as it is not directly aeroplane related I apologize and hope it is still 

acceptable to post in that area, at the end it's about batteries an 

their differences



I have an UPS which I neglected a bit and it failed recently; the

batteries in there had an ugly shape but no spill, voltage was

below 2V for each (12v 7.2A nominal)



I looked now for replacement from Panasonic (using a 17A and now 20A

since years in my plane). Interestingly enough they have two types

of this:



	LC-R127R2PG1

	UP-VW1245P1



price difference (in Switzerland) is 28CHF for the 1st and 49.80CHF for

the 2nd, that is quite a bit as I need a set of 4 . We have a bit an

unstable (overloaded) power net so the UPS does get in action at least

once a month.



I had a hard time to identify any facts why I should go the more

expensive way (a general statement, that UP-VW has double the life of a

LC-R was all I found).



Any recommendation you could give in that case?



Many thanks for the great support of this list!



Werner



do not archive

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Jul 12, 2012 9:46 am Post subject: Battery question not aeroplan related

At 10:48 AM 7/12/2012, you wrote:

 	  Quote: 	
		  



Hello Bob and all,



as it is not directly aeroplane related I apologize and hope it is 

still acceptable to post in that area, at the end it's about 

batteries an their differences



I have an UPS which I neglected a bit and it failed recently; the

batteries in there had an ugly shape but no spill, voltage was

below 2V for each (12v 7.2A nominal)



I looked now for replacement from Panasonic (using a 17A and now 20A

since years in my plane). Interestingly enough they have two types

of this:]


	


   Have you considered automotive batteries for this

   application? My UPS here has a regular car battery

   sitting outside the case connected to nice fat wires

   that extend the leads for a battery normally inside

   the case.



   I can get a lot more capacity for less dollars as

   long as it's not a requirement that the battery

   'fit inside'.



   How old was your original battery? The fact that

   it failed and changed shape suggests an overcharge

   condition. What ever your choice of battery, you

   might want to put a voltmeter on the battery and

   watch it for a few weeks and in particular after

   a power-outage event to watch the re-charge event.



   When all topped off, the battery should be floated

   at no more than 13.8 volts and no less than 13.0

   volts. In other words, too low to allow the battery

   to be charged and too high to allow the battery to

   take on 'load'.



   My UPS battery is about 50A.H. It will keep my

   desk system up for 5 hours or more.

   Bob . . .

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glastar(at)gmx.net
Guest

Posted: Thu Jul 12, 2012 12:48 pm Post subject: Battery question not aeroplan related

Thanks Bob, find my answers inside

 	  Quote: 	
		  

    Have you considered automotive batteries for this

    application?


	


The UPS is rack mounted and uses 4 batteries always 2 in series so I 

guess I will try tomorrow if I can test with two in series if it works 

(I've tried already with one but it did not work (I guess it's using 24 V)

 	  Quote: 	
		  


	


 	  Quote: 	
		      How old was your original battery? The fact that

    it failed and changed shape suggests an overcharge

    condition. What ever your choice of battery, you

    might want to put a voltmeter on the battery and

    watch it for a few weeks and in particular after

    a power-outage event to watch the re-charge event.

They were over 10 years old and I've got some warnings, but as these 
	


were LED's only and I had the operation manual not at hand I neglected 

for several weeks that then caused probably to overload as some cells 

were dead.



Cheers Werner



do not archive

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