Maintaining UPS/car batteries

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unstopabl3 (unstopabl3) 2015-08-26 20:54:44 +0500 #2881

talhawaleed;4890028:

First, your question regarding AC and DC thing tells me that your fundamentals on electrical subjects is very weak. Obviously if you are taking the measurement on battery terminals and battery wire connected to positive or negative terminals then you are measuring DC voltage and DC current.

Bhai I knew it was DC voltage but the guy at the UPS shop made me confused about the charging current and I didn't want to set a wrong value as on the clamp meter both AC as well as DC reading were being shown for current. So just to confirm one final time, whenever I'm measuring Voltage or Current by attaching the clamp meter on the battery, I should always select DC setting??? As right now my UPS is set at 17.50A when checked in AC mode and around 7.50A when checked in DC mode, so I should increase the charging to 15A while being in DC mode right??? Just confirm this please :P

The process is time consuming for you as still you are in learning stage. Otherwise its quick. I gave you a hint to increase the charging rate on temporary basis during the cutoff adjustments so that you don?t have to wait longer to see if ups hits the required cut of voltage or not.

Clarify this, that cut off voltage is a voltage once ups will stop charging the batteries. If cut off voltage has decreased on anti-clock wise rotation then it will increase on clock wise rotation of the variable.

Thanks I have successfully set the cut-off at 28.25V, but I was thinking to lowering it to 28.15-28.20V as it takes a lot of time for the batteries to reach 28.25V as the charging rate is only 2-3A after 28V. What do you think?

I right now don?t have a video recorder as otherwise I would have made a video for you. Set the output voltage on 250 volts right now as still your batteries are not fully charged. If it will be fully charged then you may end up experiencing 300 volts at output. To set the output voltage, rule of thumb is that charge your batteries fully and then adjust it by bringing it into backup mode.

Yes, that's how I have set it bro.

Output voltage is set to 260 volts maximum so that once batteries will discharge then output will also decrease from 260 till it will touch 230 or 220 volts. If it will go below 220 then may end up burning few adopters or tvs etc. so by doing so , we have defined a windows and if you will increase it more then again it will end up burning something else. If less is bad then more is also bad;

I understand what you are saying, you have already mentioned this in your OP, but my question was does using 250-265V output instead of using 270-280V provide more backup time from batteries or is it same???

Please reply and thanks a lot for your help

talhawaleed (talhawaleed) 2015-08-27 18:04:30 +0500 #2882

to make it simpler, both the meters will be off type as displayed in image. correct setting is in DC for both measurements current and voltage. so reading of 7.5 Amperes is a right figure here.
cut off t 28.25 Volts is perfectly ok, dont do anything. just cross check the current while keeping the meter in dc settings and report here again.
keeping output voltage at 260 Volts or 230 or for matter of fact at 290 has no relation with the backup time. to make it simpler, variable only maps the voltage at battery terminal against the output voltage.

we may map things the way we want but in end as soon as terminal voltage on battery terminals should reach 20.6 Volts then ups should shutdown. which may correspond to anything like we will map. it maybe badly set such as if voltage at battery terminal reaches 20.6 Volts and output can be at 200 Volts then thats a bad setting, if voltage at battery terminal is 20.6 volt and output voltage is 225 volts then you are ok. we want to be above 220 volts once voltage at battery terminal reaches 20.6 volts and at that instant ups should shut down.

unstopabl3 (unstopabl3) 2015-08-30 16:01:05 +0500 #2883

talhawaleed;4891323:

to make it simpler, both the meters will be off type as displayed in image. correct setting is in DC for both measurements current and voltage. so reading of 7.5 Amperes is a right figure here.

cut off t 28.25 Volts is perfectly ok, dont do anything. just cross check the current while keeping the meter in dc settings and report here again.

keeping output voltage at 260 Volts or 230 or for matter of fact at 290 has no relation with the backup time. to make it simpler, variable only maps the voltage at battery terminal against the output voltage.

we may map things the way we want but in end as soon as terminal voltage on battery terminals should reach 20.6 Volts then ups should shutdown. which may correspond to anything like we will map. it maybe badly set such as if voltage at battery terminal reaches 20.6 Volts and output can be at 200 Volts then thats a bad setting, if voltage at battery terminal is 20.6 volt and output voltage is 225 volts then you are ok. we want to be above 220 volts once voltage at battery terminal reaches 20.6 volts and at that instant ups should shut down.

Don't know what the first image is showing but thanks for clearing my doubts.

Currently I've set the charging rate at 16A DC as 14 or 15A were too low and the batteries weren't even being charged fully in 2 hours charging after being used for only 1 hour (2 fans and a couple of energy savers). Now they get charged within 2 hours as I've also reduced the the cutoff to 25.17V. So far everything is working fine but I'll keep monitoring the charging rate, backup time, water level and SG of cells and report back in a week.

Now about the other setting where the UPS should shutdown at 20.6V, I know I have to use the Battery Low variable, but how do I match this with the 220V output thing you are talking about??? Although I understand what you are saying, but how to set both of them up in synch??? If I use the Battery Low variable to shut down at 20.6V, shouldn't that automatically adjust the output voltage value at around 220V as well?

Thanks

overspeed111 (overspeed111) 2015-08-30 16:50:10 +0500 #2884

Bro how much charging volts for 100 amps each two batteries ups and how much cut off voltage for it, currently i dont have ampere meter so cant calculate (from where to buy that) and specific gravity meter.
thank you

talhawaleed (talhawaleed) 2015-09-07 18:01:36 +0500 #2885

SELLER IS TRYING TO FAKE THE PRODUCT AS BEING SOLD BY AGS

Recently got hold of this bottle named as battery Tonic with AGS battery picture on it, after having tested it, I found the TDS value of 339ppm. The shop keeper told me that he was given two cartons by a dealer for free and asked him to sell it. 24 bottles within two pack got sold out quickly for Rs.100 per bottle while people thinking it to be a product from AGS tonic.

agm1pk (agm1pk) 2015-09-08 04:38:09 +0500 #2886

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adnanzafar71 (adnanzafar71) 2015-09-09 01:59:30 +0500 #2887

. Can anybody explain the functions of these variables named charging full, battery low and main...

adnanzafar71 (adnanzafar71) 2015-09-12 15:45:58 +0500 #2888

I suppose this thread is very much active. Where are the experts??????

talhawaleed (talhawaleed) 2015-09-14 19:05:36 +0500 #2889

These things have been explained multiple times within the same thread.

Charging full: adjusts the cutoff voltage at which charging stops, should be adjusted to
14 or 28 Volts depending upon your setup.

Battery Low: this variable adjusts the voltage at which your ups should sound beep and should
Shutdown. This is adjusted at 10.3Volts or 20.6 Volts depending upon your setup.
The variable protects the battery from getting drained to a limit that it becomes bad for battery.

Main: this variable adjusts the output voltage and should be set to 250 Volts once batteries are in fully charged state and put into the backup mode.
As lead acid battery will discharge then output voltage will start to drop, we don’t want it to drop below
220 Volts that’s why its set to 250 Volts as otherwise it will blow away the adopters, tv’s etc.

adnanzafar71 (adnanzafar71) 2015-09-15 13:23:58 +0500 #2890

Thanks a lot dear. This really cleared my doubts about the setup.

nomanali89 (nomanali89) 2015-09-24 19:01:29 +0500 #2891

Hello guys what I understood after reading your thread that after preparing battery with proper electrolyte the proper charging is second most important thing So I wonder if there are any local or imported chargers available which provide these functions
1-Manual Equalize charge
2-Adjustable Voltage
3-Adjustable Current
And how much do they cost?

siraj_7 (siraj_7) 2015-10-05 08:35:46 +0500 #2892

Buy a constant charger (tell shop keeper Transfaaarmar wala sadaa charger chahiyeh.. aaatomaatic nahi chahiyeh), in Karachi in co-operative market a 12am 12v charger (10.5-11.5 V in actual) costs about a 1000. Buy a digital volt meter (Rs.300) connect then with battery. When the volt meter reads 15, let that be for 15 minutes and then disconnect the charger and battery is ready to use.

nomanali89 (nomanali89) 2015-10-13 11:53:16 +0500 #2893

After some days for waiting for a reply I thought none is going to answer on my first and only post therefore i checked this by chance after many days
So your suggested Manual charger Doesn't it has any upper limit for cut off voltage?
Also I wanted to know how about variable DC power supply kit 0-24 volt 5amp would it work without heating up ?
I live in Lahore by the way

wasim625 (Wasim) 2015-10-17 04:00:06 +0500 #2894

@ishtiaq778 brother where can I get Imran & Co IC 104 KIT in Lahore? Any reliable seller/shop you know of ??

siraj_7 (siraj_7) 2015-10-19 10:46:57 +0500 #2895

Bro I am in Karachi, I don't know about Kits. I bought an APC ups.

The manual charger will keep charging your battery and destroy if unsupervised. It is only good to charge the battery for the first time or initial charging as they call it. For that you fill the electrolyte in it. Wait 30 minute to 2 hours then connect the charger and a volt meter to the battery. The voltage will start increasing from 12.4 to 13 and then 14 and then finally when it reaches from 14.9 to 15 then wait for 15 more minutes and turn the charger off and the battery is ready to use with UPS.

Update: Everyone please do the above at their own risk and this may not be applicable to all batteries. Also some experts are against charging a battery to 15v even as initial charging. I did it because I bought a brand that recommended this procedure to fill electrolyte, wait for 30 minutes (I waited 2 hours) and then charge the batteries until they reach 15v and then wait for 15 minutes and disconnect and they are ready to use.

nomanali89 (nomanali89) 2015-10-20 00:07:57 +0500 #2896

Ok I searched the local Lahori market and there was no manual charger so I bought this kit called "Trickle charger" by default it was set at 13.7V for cutoff but at my request they now changed it to 15.7V I wanted it at exactly 15V but they said zenor diod is either available in 13V or 15V anyway I just purchased it and will put it to test and will update here with the results .........

Sdogar (Sdogar) 2015-10-20 06:35:58 +0500 #2897

@talhawaleed

I have a 600 Watt aurora UPS. It has on back side a button mentioning wide & narrow.I asked a aurora technician and he told that at narrow UPS will charge on 10A and on wide at 20A. My UPS stopped charging last week and i got it repaired from a local guy, he told that it stopped charging due to inflamed resistors or whatever(the drum type things in UPS) and maximum output voltage during charging was 12.2 volts and replaced them.Now i tested the UPS after reconnection with the battery and it shows and voltage of 13.7 maximum volts after sometime when charging and doesn't increase this voltage.My question is :
1. What should be charging voltage of this UPS? Is 13.7 OK, i studied that charger should go to 14.2-14.4 to avoid sulfation,13.7 is OK but in long run it can result in sulfation.
2. How to check what is the cutoff voltage.
3. What is the wide and narrow in UPS?

nomanali89 (nomanali89) 2015-10-20 12:17:40 +0500 #2898

Sdogar;4932832:

@talhawaleed

I have a 600 Watt aurora UPS. It has on back side a button mentioning wide & narrow.I asked a aurora technician and he told that at narrow UPS will charge on 10A and on wide at 20A. My UPS stopped charging last week and i got it repaired from a local guy, he told that it stopped charging due to inflamed resistors or whatever(the drum type things in UPS) and maximum output voltage during charging was 12.2 volts and replaced them.Now i tested the UPS after reconnection with the battery and it shows and voltage of 13.7 maximum volts after sometime when charging and doesn't increase this voltage.My question is :
1. What should be charging voltage of this UPS? Is 13.7 OK, i studied that charger should go to 14.2-14.4 to avoid sulfation,13.7 is OK but in long run it can result in sulfation.
2. How to check what is the cutoff voltage.
3. What is the wide and narrow in UPS?

Dear I have been through this and it took me some time to understand this confusing functionality

wide and narrow has nothing to do with charging ........
Your cut off voltage should be 14.4V and then float voltage should be anywhere between 13.6V to 13.8V,
What you are looking at is a float voltage which is next step after cutting the voltage at 14.4V, to know your cuttoff voltage you have to check it during charging and check the voltages all along ,your multimeter will first show 14.4V and then it will drop to 13.6V

But remember only good quality automatic UPS provide this ideal charging
I'm using homage UPS and to my surprise it never charged upto 14.4V it always cuttoff at 13.6V therefore I had to use a separate charger

Sdogar (Sdogar) 2015-10-21 05:16:42 +0500 #2899

I have rechecked it at different times and found that it does charge at 14.3 and then comes down to 13.7 which is float charge. So i think it is doing good job.

nasirjavaid (nasirjavaid) 2015-11-05 05:18:17 +0500 #2900

Imran Brothers or Imran and co. Hall road.