Naked Science Forum

Non Life Sciences => Technology => Topic started by: syhprum on 11/06/2020 18:58:46

Title: What is the correct charger voltage for car type lead acid batteries in an UPS?I
Post by: syhprum on 11/06/2020 18:58:46
I have seen various figures quoted between 2.3 v and  2.4 v per cell assuming a near zero output resistance of the charger up until its current limited cut off.
I had in mind 2.33 V but would like to know the approved figure   
Title: Re: What is the correct charger voltage for car type lead acid batteries in an UPS?I
Post by: Bored chemist on 11/06/2020 23:33:05
It depends...
https://en.wikipedia.org/wiki/Float_voltage
Title: Re: What is the correct charger voltage for car type lead acid batteries in an UPS?I
Post by: evan_au on 13/06/2020 00:01:33
Just to draw your attention to one short section in the above link: "Temperature compensation".

Even after you know the chemistry of your battery, the ideal float voltage varies slightly with the battery temperature.
Title: Re: What is the correct charger voltage for car type lead acid batteries in an UPS?I
Post by: syhprum on 13/06/2020 11:24:54
I was surprised to see that a lead acid battery was used in a military aircraft I did not think they were expensive enough !