Why the battery voltage is not rising up from 13.2 volts to 14 volts or to even 14.4

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danishdeshmuk

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Why the battery voltage is not rising up from 13.2 volts to 14 volts or to even 14.4 volts ?

Its a new wet lead acid battery of 12 volts ........ connected to a charger ...... the charged it from 12.4 volts till 13 .2 volts but the volts are not rising up hen 13.2 volts

What to do ?

Is it alright ?
 



There is several possibilities for this :

- Bad battery (sulphated, damaged plates,...)

- Weak charger - small power/current of charging

- Charger voltage is low



Measure voltage and current, see what happen in circuit.

Measure voltage of charger without battery.




Best regards,
Peter

:wink:
 

Without battery the charger can't on ....... cuz its an inverter's charger ........ i have to hook up the DMM in series to measure the current ......

Also i read that each cell of lead acid wet battery is of 2.2 V and there are 6 cells so the total voltage would be 13.2 V , what do you say ?
 

danishdeshmuk said:
Without battery the charger can't on ....... cuz its an inverter's charger ........ i have to hook up the DMM in series to measure the current ......
Click to expand...

Use a dummy load instead of the battery.

- - - Updated - - -

tpetar said:
There is several possibilities for this :

- Bad battery (sulphated, damaged plates,...)

- Weak charger - small power/current of charging

- Charger voltage is low
Click to expand...

I don't think it would be a 'weak' charger as it has charged to 13V2. Is it a 'smart' charger that cuts-off at a certain voltage?

Is the charger designed for lead-acid batteries?
 

kam1787 said:
Use a dummy load instead of the battery.

- - - Updated - - -



I don't think it would be a 'weak' charger as it has charged to 13V2. Is it a 'smart' charger that cuts-off at a certain voltage?

Is the charger designed for lead-acid batteries?
Click to expand...


What would be a dummy load other than battery to check charging ?
 

a resistive load; resistor, or perhaps a simple electric kettle or light bulb

some value of around 10 to 20 ohms

of >= 20Watts power rating
 

better check the battery with a spare 12V automobile headlamp bulb, if the bulb lights up when connected to the battery, then battery is all right, so there must be something wrong with the charger
 

Tipu606 said:
.......12V automobile headlamp bulb..........r
Click to expand...

A plain automobile light bulb [signal, or rear light] makes a good dummy load but get a bayonet socket for it, as it is harder to hold or solder leads to it
 

danishdeshmuk said:
Without battery the charger can't on ....... cuz its an inverter's charger ........ i have to hook up the DMM in series to measure the current ......
Click to expand...

How do you mean inverter charger, I think you want to say SMPS (switcher).

Amperemeter goes in serie and voltmeter in parallel with terminal points.

Maybe charger voltage dropdown under load, and charger dont have enought power (current) to increase charge level and voltage. What is declared voltage and current of that charger ?


danishdeshmuk said:
Also i read that each cell of lead acid wet battery is of 2.2 V and there are 6 cells so the total voltage would be 13.2 V , what do you say ?
Click to expand...

Decribe battery, capacity in Ah, product ID or maybe photo ?



Best regards,
Peter

;-)
 

tpetar said:
Maybe at temp 50C :smile:

When charging is done in higher temp environment then charging voltage must be decreased. But we dont have that information for this battery.



Best regards,
Peter
Click to expand...


ya we dont have it but these are typical values for lead acid

As it was in the table It was Ok to have....

**broken link removed**
 

venkadeshm said:
ya we dont have it but these are typical values for lead acid View attachment 93879

As it was in the table It was Ok to have....

**broken link removed**
Click to expand...


Float 13,5-13,8V depending from temp.

See datasheet similar information you will find in other batteries.



I will not count on informations from that web site. Lots of people just make copy paste to make web site.

But for me on first place is to respect manufacturer recommendations and infos from product datasheet, and if manufacturer say 13,2V then this is 13,2V.



Best regards,
Peter

:wink:
 

Attachments

  • GP1272 12V 7.2Ah.pdf
    789 KB · Views: 120

Ya i said typical values.. you are showing a battery that is having 13.5 to 13.8v floating voltage... They are there but without knowing part values what will you Do.. looking at a particular part number?? Or looking at typical values?? Our discussion could only end with Original part number.....
 

When charging was down about 12.4 v and the charger was really charging the battery and providing almost 3.5 amps dc in series and as the battery voltage reaches to 13.2 to 13.3 V the amps drop down to 0.15 amps dc
 

When charging was down about 12.4 v and the charger was really charging the battery and providing almost 3.5 amps dc in series and as the battery voltage reaches to 13.2 to 13.3 V the amps drop down to 0.15 amps dc
Click to expand...
Clarifies that the charger is cutting down current at 13.2 V, so it's definitely not a battery problem. I assume that the charger is doing this by design, but could be a malfunction as well.
 

As FvM said, I also think the upper limit of the charger voltage is set by design. Perhaps you can find a trimmer of this setting on the charger board.

I also produce inverter/charger sets. For MCU availability I had to use AT89C2051 (20-pin). And I had to use one trimmer to set the limits for both the inverter and the charger.
For the inverter, the trimmer setting regulates the RMS voltage of its ouput because, at the start, the battery voltage could be as high as 14.5 V (below 12V, the regulation stops). Also for the inverter, this setting determines the minimum battery voltage (as 10V) below which its output is cut off.
For the charger, the same setting determines the upper battery voltage (as 14.5V) after which the charging current decreases slowly down to the level of the battery leakage and as long the battery voltage is above 13.5V .

So I tend to believe that the limit 13.2 V is set by your charger. Perhaps it can be increased, likely with an internal trimmer.
Unfortunately, in my products, when a user plays with the voltage trimmer, he also disturbs the settings of the inverter.
 
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I try to get information about battery, but I see that I have higher chance to enter in Area 51 and make few photos. :smile:

There is old wet type of lead acid which have float voltage to 13,2V. I dont see that type of lead acid todays, manufacturers stop production of these batteries because lower voltage and charging system incompatibility. Usually these batteries are used in trucks and have big capacity 100Ah and up.

In other hand, maybe we have wrong charger, and we try to charge battery with wrong charger.



Best regards,
Peter

:wink:
 

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