Maintaining UPS/car batteries

[saadzzz]

bump!!

[alee1]

bump!!

The starter of thread mentioned earlier the ac drainage isnt suitable.reason being k it collects dirt when air is passing through grills
@margallar
voltage stabilizer cant reduce noise of fans,this noise is not because of voltage problem,in electricity their is one more thing named as frequency,frequency of sinousidal wave,in pakistan we use 50 cps.and the noise is when the ups fails to produce 50cps.
hope it helps

[talhawaleed]

No I don’t think so that is the reason as if you will measure the frequency of current on Wapda lines then you will find it to be 50 Hz, where as once you will measure the frequency while UPS is also on backup mode then it will be either 48 Hz or 52 Hz. Not much of the difference as I have practically verified this myself. Also varies from cases to case and UPS to UPS. I have tested 4 and found the same results.
This can probably because of reason that output Voltage under backup mode is usually 260 Volts once system is fully charged and system is on backup mode. With passage of time as batteries run out of backup then this voltage decrease till the time it reaches 220 Volts and in some scenarios 200 Volts, 190 Volts and 180 Volts. This is because all the UPS systems are not adjusted properly.
So when output is normally between 230-220 Volts then you won’t experience any noise from fans. This is probably because of wrong power supplied to the fans.

Lets suppose your fan demands 1 Amperes of current at 220 Volts correspondingly power becomes
P=VI
P=220 W

But what if V=260

Then I=220/260 = 0.84 Amperes.
Fan will automatically draw the current which it needs and not more than that. Mismatch here is causing the issue. Probably fan is very sensitive to correct Voltage.

[xzap042]

No I don’t think so that is the reason as if you will measure the frequency of current on Wapda lines then you will find it to be 50 Hz, where as once you will measure the frequency while UPS is also on backup mode then it will be either 48 Hz or 52 Hz. Not much of the difference as I have practically verified this myself. Also varies from cases to case and UPS to UPS. I have tested 4 and found the same results.
This can probably because of reason that output Voltage under backup mode is usually 260 Volts once system is fully charged and system is on backup mode. With passage of time as batteries run out of backup then this voltage decrease till the time it reaches 220 Volts and in some scenarios 200 Volts, 190 Volts and 180 Volts. This is because all the UPS systems are not adjusted properly.
So when output is normally between 230-220 Volts then you won’t experience any noise from fans. This is probably because of wrong power supplied to the fans.

Lets suppose your fan demands 1 Amperes of current at 220 Volts correspondingly power becomes
P=VI
P=220 W

But what if V=260

Then I=220/260 = 0.84 Amperes.
Fan will automatically draw the current which it needs and not more than that. Mismatch here is causing the issue. Probably fan is very sensitive to correct Voltage.

voltage is not the issue. changing voltage only changes the speed, thats what your fan dimmer does, reduce voltage. frequency is not much of an issue either. Its the waveform that causes the issue. wapda line gives sinusoidal wave whereas inverter only approximates the sine wave. In case of cheap ups its simply square wave which causes noise whereas in case of better one sine wave is approximated. its still not sine wave.

[Xulfiqar]

The starter of thread mentioned earlier the ac drainage isnt suitable.reason being k it collects dirt when air is passing through grills
@margallar
voltage stabilizer cant reduce noise of fans,this noise is not because of voltage problem,in electricity their is one more thing named as frequency,frequency of sinousidal wave,in pakistan we use 50 cps.and the noise is when the ups fails to produce 50cps.
hope it helps

Its better than the dissolved salts/bleached water you get from the tap. tastes bad as you are accustomed to a certain taste of water. The battery doesnt care about taste, it needs pure H2O

[shqamar]

i was amazed today when i went to my battery shop for checking my battery water level , i was amazed that the guy topped up pure tap water in my battery when i argue he said sahab we only topped once chemical water when battery is new and we put the liquid for the first time after that its purely water which wouldnt make sense to me atall , i would like to ask our expert here what this theory is all about and do i need to take all water out from battery and ask him to refill it hence he was so convinced its all fine now , and what should we use when we filling up our battery water as its too much confusion about this topic .
Many thanks

[talhawaleed]

i was amazed today when i went to my battery shop for checking my battery water level , i was amazed that the guy topped up pure tap water in my battery when i argue he said sahab we only topped once chemical water when battery is new and we put the liquid for the first time after that its purely water which wouldnt make sense to me atall , i would like to ask our expert here what this theory is all about and do i need to take all water out from battery and ask him to refill it hence he was so convinced its all fine now , and what should we use when we filling up our battery water as its too much confusion about this topic .
Many thanks

You should have slapped the guy and then should drain the entire Acid on his head.

Understand the difference between Distilled water and Tap water.

Within days, you will experience a reduction in backup time

[shqamar]

i wish i could have done that , surprising thing is thats the owner of the battery shop and hes been running this shop for last 25 years , the guy checked it with the meter and told me no problem water quantity is a bit high but u will be fine just bring the car after a month and i will check again , btw whats the cure now , do i have to drain the whole liquid from the battery and put distilled water or buy bottles of battery water from market and put them back in my batter ?

[RANASAHAB]

dear talha i am using 2000VA 24 volts ups with exide 145amp 21 plates batteries since 1.5 years.every thing is fine back up time,charging etc but the batteries are getting hot to touch.should i change the acid or adjust the gravity.please advise.
Regards

[Xulfiqar]

i wish i could have done that , surprising thing is thats the owner of the battery shop and hes been running this shop for last 25 years , the guy checked it with the meter and told me no problem water quantity is a bit high but u will be fine just bring the car after a month and i will check again , btw whats the cure now , do i have to drain the whole liquid from the battery and put distilled water or buy bottles of battery water from market and put them back in my batter ?

Its a sad situation - people who are in their trades are not faithful to it.. and who are, are usually hard to find.

If your original brand new battery was prepared and put into service with lab grade PH checked distilled water and pure sulphuric acid and then this certain shop poured tap water in it - YES IT WOULD HURT.

but your battery for all its life has been working on tap water etc. Whatever backup time there is - will remain the same, which according to every shop would be 100% but according to proper testing people would not be even considered 50%.

Get the idea?

Next time source/make some distilled water - about 10 litres of it, buy a 15 litre plastic bucket and find a battery place - pay them for their acid, and prepare the acid in the bucket of correct SG, pour into battery, let it stand for 5 minutes and let them charge it for the first time. Take home and put into service.

the SG of the mixture should be 1.270 at room temperature after stirring it in the bucket. If you dont trust their hydrometer, get a generic 1 litre plastic fridge bottle from the plastic shop, it weighs 50 grams empty without cap. (weigh on digital scale to confirm)

Fill with exactly 1 litre of water and mark the level with a marker, empty bottle and fill with acid mixture to the mark, it should weigh 1270+50 grams i.e. 1320 grams. You have a definite positive result that your mixture is 1.270 SG.

simple...

p.s. another trick to speed up the cool down process is to freeze half of the distilled water into ice

[talhawaleed]

@RANASAHAB

Number of different scenarios can cause this
1) Over charging with high ampere current
2) Wrongly set “cut off voltage”
3) Wrong gravity
4) Short circuiting of plate due to deposits built up in between the plates
I would have definitely tested all these factors and then would have drained the batteries and would have performed the flush.

@shqamar

Flush is necessary in your case and secondly I am not sure if you have an access to the Acid prepared from distilled water or not but I guess most of the people don’t have such an access. You should always have a bottle of distilled water present in your garage. It’s very easy to prepare and you should always use it to top up the batteries. No tap water and if you want to experiment then try to use Tab water in your UPS batteries and very soon you will see the adverse affects.

[brownrose78]

what is effect of no. of plates if other specs are same

[Xulfiqar]

what is effect of no. of plates if other specs are same

stronger cranking amps - meaning it can sustain high sudden discharge loads.

[brownrose78]

so in ups, what will be diff. if i prefer 28 plates over 21

[fas133]

so in ups, what will be diff. if i prefer 28 plates over 21

First of all plates are always in odd no.'s and second more plates means more amperes and for ups more backup time.

[brownrose78]

good info brothers.

[xzap042]

yes, all is good, but the basic problem remains the same. where to get distilled water??

[shqamar]

yes, all is good, but the basic problem remains the same. where to get distilled water??

i may sound completely dump but i would like to ask what exactly is distilled water , is it a filtered watered or what exactly we mean by distilled water ?

[Xulfiqar]

google it, we learned this in secondary school too. And usually got kicked out of the lab because we were distilling more than just water.

[Vaqas1]

2 Issues

UPS Exide battery around 9 months old backup time decreased a lot. I use A/C water to top up.

Car Battery hmm 6 months FB 60ah. Las time i checked there was no water in it hmm even though i check it every week.

I bought the below from Metro how can i use these to improve my batteries?