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Author Topic: battery connection in parallel  (Read 2966 times)
I n s i d e r 2010
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« Reply #40 on: March 06, 2010, 09:18:53 PM »

Now ganito, kasi marami na ako naencounter na technician, isa lang tanung ko lagi, ano ba ang function ng transistor? Isa lang sagot nyan lagi, AMPLIFIER.

(qoute of sis glenjoy)

thanks sis sa pananaw mo sa mga technicians
pero wag masyado silang pagtawanan
ndi po lahat ng technicians ay galing sa technical studies

about ur comment sa transistor na ang sagot ay amplifier lagi
tama po yun ngunit kulang nga lang

kung tanungin kaya ng tech ang engr ng ganito?

master engr yan bang design mo ay galing sa utak mo or kinopya mo lang sa pinagaralan mo?
mster designer un bang pinagaralan mo ay galing sa master din?
pwd bang ipaliwanag sa katotohanan at ndi sa libro lang
nakakatawa dba pag ganun ang tanung

@glenjoy
sana wag ka magalit sa post ko
kung tanungin ka kaya ng bobo sa theory na technician ng ganito,  ano isasagot mo?

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« Reply #40 on: March 06, 2010, 09:18:53 PM »

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« Reply #41 on: March 06, 2010, 09:47:31 PM »

Wala ako alam na design na kinokopya sa piang-aralan, if you will review any text used in engineering, tanga lang ang kokopya ng circuit dun.

Now, kung may nagtatanung sa akin na sa tingin ko nagsasayang lang oras ko, isa lang sagot ko, magbasa ka. Dahil di lahat ng bagay sinasawsawan lang, dinadaan muna yan sa pag-aaral, kung hindi you will be enetering the viscious cycle of reinventing the wheel.

Design will always be based on studies of others, pwera lang kung scientist ka na yung idea mo eh napaka unique.
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« Reply #42 on: March 06, 2010, 09:54:15 PM »

no comment master

baka sagutin mo ako ng "magbasa ka'

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« Reply #43 on: March 06, 2010, 11:22:37 PM »

now this is what i called hot topic! dahil nagkakainitan na po kayo.. anyway lahat po kayo ay nakatulong sa tanong ko.. ang gusto ko lang naman malaman is ano ang masusukat mo. 1st yung mataas na voltage syempre. 2nd masisira yung battery na mababa ang voltage. 3rd madidraine ang 12v kc mag sisilbi syang charger nung 6v. no matter what is the outcome. hindi natin pwedeng iparallel ang dalawang battery na kahit magkaparehas ang amp. pero magkaiba ang voltage. peace po tayo he he he he sa susunod na may magtanong sa akin nito sasabihin ko sa kanya hindi ko alam.. bakit di mo subukan iapply mo tapos sabihin mo sa akin kung anong nangyari he he hehe he..peace po tayo again.. mabuhay po kayong lahat.. at master cess pahiramin mo nga ako ng lambda mo para makuryente na itong mga arabo dito..
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« Reply #44 on: March 07, 2010, 11:36:28 PM »

mga sis! Smiley ano po ang masusukat nyo na voltage reading if one is 12v 7ah is connected in parallel to a 6v 7ah battery? kagaya po b ito ng capacitor? kasi may nakapag sabi sa akin na ang masusukat mo doon ay yung may mataas na reading.. which is 12v tama po ba un?

ang sabi ni MR. Bernard Grob, kapag nagkaroon ka ng dalawa o mahigit sa dalawang voltage source at connected ito in parallel, ang masusunod dito o ang masusukat mo na Vout ay yung may pinakamababang voltage supply.

VLow = Vout < VHigh?

ilang beses ko ng trinay ito, student pa lang ako. sa college nagkaroon kami ng experiment dito. kahit hanggang ngayon sinusubukan ko pa ito.

lumalabas sa mga experiments namin na:

VLow < Vout < VHigh,

VLow < Vout, nearest BUT NOT equal..

assuming all voltage source in same current capacity.
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« Reply #45 on: March 07, 2010, 11:53:24 PM »

magsabunutan na nga lang kayong dalawa,mabuti pa..heeheheheehhe Grin Grin Grin
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« Reply #46 on: March 08, 2010, 08:40:40 AM »

Sir Ian... ginulo mo buhay namin dito....ang lupit kasi ng tanong mo.

@ glenjoy.

ako po ay techincal na tao as in vocational course lang po natapos ko.
pero kung ako ang natanung nyo regarding sa gamit ng transistor.. hope hindi ka matatawa sa isasagot... alama ko namang hindi lang amplify ang pwedeng i amply sa transistor.

ngunit subalit at dapatwat.. sakling amplify din ang maisagot ko sau.. hindi yun ang paraan upang  pagtawanan mo.
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« Reply #47 on: March 08, 2010, 09:52:58 AM »


nagbabasee din  kasi  kami sa actual experience..
at saka sana if u dont mind  hndi  naman  lahat  ng theories  ay  tama  o minsan pa nga ay masxadong  malayo sa actual hands-on or output

kaya nga  every year fast through ni rerevise ang mga mali sa mga libro para itama  kng  meron mang mali..


On the contrary, it is the other way around.

A theory is always backed by a mathematical model which we call formula.  The mathematical model not only should be able to explain (experimental) results, but even more important, it should be able to  predict results in advance. It should always give the correct answers, 100% of the time, within a certain precision and boundary conditions. Only after some rigorous tests and verifications a theory is accepted as valid.

We are accustomed to a computer lingo that goes as “Garbage in, garbage out”. The mathematical model of a theory works very much in the same way. It will just work as a rubbish generator if you supplied it with incorrect (or incomplete) inputs.

In the case of two dissimilar batteries in parallel, incorrect inputs may take the form of unknown initial conditions:

1. We don’t know the battery initial state of charge.
2. We don’t know the battery initial effective series resistance of each cells.
3. We do not even know the exact capacity of the battery under tests (i.e. 400mAH is the manufacturer guaranteed minimum, not the actual capacity.)
4. To make matter worse, All of the above exampled parameters are sensitive to temperature and other environmental factors.

With too many unknowns, repeated tests will yield different results, all seems contrary to what the theory predicts.

It is not because the theory is incorrect. It is because of our limitation or inability to provide the correct inputs.

Cheers! Grin
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« Reply #48 on: March 08, 2010, 10:16:52 AM »

+1 impakta point kay tita boy Grin
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« Reply #49 on: March 08, 2010, 10:19:09 AM »

100% agree with sir Born2BeWired.

a lot of times we disregard theory because that's not what's happening in actual experiments. but on all this times we also disregarded something, 'di naman talaga nasunod 'yung actual theory.

tulad sa batteries in parallel, sasabihing mali 'yung theory ni Millman dahil may point na ang mababasa e 'yung higher voltage. bakit? hindi nailagay sa consideration 'yung chemistry ng battery. on overcharge conditions, the smaller (Nickel) will exhibit a high resistance, makikita ngayon 'yung higher voltage. same with SLA dahil naman pwedeng 'di na kayang tumanggap nung lower voltage ng charge.

sa EMC compliance ko natutunan na halos lahat ng theory (and lahat ng laws) ay tama, mali lang 'yung pinapasok natin dahil merong kulang na information. they are called the hidden schematics, and sometimes they are dynamic. Wink sa EMC kasi maraming iniisip na black magic art siya dahil mahirap i-quantify, pero mali lang pala 'yung approach. once every part of the hidden schematic is laid out, lahat ng computations, same na sa actual.

we also do not live in theory alone. pero kapag merong 'di nagma-match sa theory at actual, merong iba, so we still investigate what's feeding the actual that doesn't feed the theory. that's how the other people discover new or supplementary theories. Wink
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« Reply #50 on: March 08, 2010, 11:15:20 AM »

nakkuh...engineer din.
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« Reply #51 on: March 08, 2010, 11:44:36 AM »

this is not a battle between engineers and technicians...

I have a lot of friends even relatives na technicians and based o my observations some of them use trial and error method which is not a good practice in the world of electronics...

sometimes they can design ckts. like amplifiers... yes it is functioning but no safety and durability considerations...

there are things that technicians can do na di kaya ng engineers and there are also things na kaya ng engineers na di kaya ng technicians simply because magkaiba yung knowledge training...

electronics is not an exact science kaya minsan may mga experiments na gumagana pero in theory hindi dapat... bottom line is, gumana man sya in actual at wala (pang) pinsala, pag hindi pwede sa theory wag nang makipagsapalaran... theories can predict the future... di m pa kinakabit yung battery with dissimilar voltages alam na ng theory na pweding sumabog, kung natsambahan na di sumabog, wag nang ulitin...

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« Reply #52 on: March 08, 2010, 11:55:01 AM »

nakkuh...engineer din.

I never wanted this to be a war between technicians and engineers. both should live harmoniously, I respect my technician peers as I respect my engineering peers. on some occasions mas mataas pa respect ko sa technician peers ko than on my engineering peers dahil mas may sense sila pagdating sa technical. mas marami silang gustong matutunan. sa pinapasukan ko ngayon, I will be training a technician for design dahil mukhang malaki ang potential. gusto niyang malaman lahat ng hinahawakan niya.

the small voltages battery parallel at much high voltages will be act as charging.

if I may ask, ano ang voltage na nasusukat kapag nakasaksak ang isang battery sa charger? was it the full voltage of the charger or is it the lower terminal voltage of the battery? if it was the full charger voltage, then battery indicators should have already indicated it as full?

In parallel, you have a problem since 4 > 3 so now the 4V source will be sending current into the 3V source. You will end up with 3V and probably something getting warm or even burning up.

iinit ang plate ng 6 volts
mapupunta ang lakas ng 12 volts baterya sa 6 volts battery

pero ang masusukat ay ung voltage ng animoy naging charger ang gamit which is 12 volts batt
pababa ng pababa hanggang sa masira ang 6 volts batt. ung 12 volts batt naman ay manghihina kz mawawalan unti unti ang kanyang lakas.

yup, this is correct. and eventually, both will settle to a voltage nearer 6V (the higher the current a battery sources, the faster its voltages dips, just using 20A out of 12V 12Ah batteries, from 13.5V, nasa 12V area na kaagad within few seconds). then totally going down to around 1.5V, kung saan parehas sa kanila ay wala ng lakas to give current to either. (in my previous accident 192V parallel with 120V bank, nag-settle sa 140V bago bumaba sa 50V, in few seconds nag-open 'yung connecting wire sa 196V bank)

at short circuits, SLA's can never give away its full Ah rating. measured lang 'yan at C/20 or 20 hour discharge time (you may ask your friendly Motolite dealer or technician sa plant). para makakuha ng isang buong oras, typically C/2. so sa 4Ah, 2A will mean a full hour of usage. sa short circuit, around 5 seconds to 15 seconds lang 'yan makaka-source ng current then babagsak na sa less then 4V. how did I know? yes it was written in the datasheets, but I have to prove it to my boss back then, kaya on a daily basis I do actual tests, linalagay pa sa freezer dahil pinapadala abroad 'yung products, but most of the times under the heat of the sun. SLA-powered 'yung product namin kaya kailangan kong gawin in actual. I've been abusing SLA's for more than a year in my previous job.

trial and error method which is not a good practice in the world of electronics...

I also do trial and error, especially in RF, dahil walang equipment. Cheesy my former professor calls it TAE method. acronym ng trial and error. Grin Grin Grin
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« Reply #53 on: March 08, 2010, 12:45:12 PM »

salamas sa mga tugon nyo mga masters

@sis akhen

regarding trial and error ay mali po talaga yun

sinabi mo na kz na error eh

alam nyo po ba na ung trial na yan ang sanhi o dahilan kaya maraming ckt design na gumagana na ngayon? totoo na gawa ito ng isang engr designer pero bakit sandali lang ang buhay ay paktay na agad ang unit? sa palagay ba ay tama ang disenyo? kung tama ang disenyo bakit nasira agad?sa ganitong pangyayari ay busit na ang may ari sa kabibili ng parts base sa pagbabalik ng original design pero wa epek parin. ngayon kung gusto mo na paganahin ulit or irepair ung unit ay magiisip ka ngayon kung bakit ndi nagtagal ung orig na value,gagawa ka ngayon ng paraan para maitama ung kamalian na design ng tinagurian marunong sa disenyo.
dahil sa actual na pag iiisip ng mas subok mo ng materyales ay mapapagana mo ang kapalpakan ng disenyo. samakatuwid ay dahil sa isang inaakala ng mga marurunong sa technolohiya na maling practices ang tial method ay maling kahunghangan (sori sa word ko)at dapat sana sa ganitong sitwasyon ay magpasalamat pa ung ckt designer sa inaakala nyang bobong tech kz muling nabuhay ung unit dahil sa kanyang kapalpakan at sana ay gumawa pa sya ng paraan para ikorek ang kanyang pagkakamali pero dahil narin sa pride at pagmamalaki ay pilit nyang iiwasan ang ganun para narin sa kanyang katanyagan "kuno" at pilit na sasabihing mali ang trial na ginawa ng tech para pangalagaan lang ang kanyang reputasyon pero ang katotothanan ay nangyari na at dahil yan sa isang tech na pilt inaalam ang kasalukuyang katotohanan.

about sa mga technician na amplifier lang ang alam na isagot sa kung ano ang transistor
malamang ndi electronics tech un. baka pest technician po ang nakaharap nyo

at ndi po lahat ng tech ay galing lamang sa technical studies

 salamas po sa lahat ng tumugon sa thread na to at pagpalain tayo ng maykapal sa mundo ng electronics. hangad po namin ang katotohanan at ndi lang ung bolpen at papel
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ang PIKON ay laging TALO,tandaan nyo po yan mga kapatid. IRESPETO ang bawat isa!
ang PANLALAIT sa kapwa ay isang kasalanan na
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« Reply #54 on: March 08, 2010, 01:20:19 PM »

^ sis, hindi mali ang trial and error. ginagawa rin 'yan sa industry. kahit ako dumadaan sa trial and error, especially with new brands ng component.

minsan mula tanghali hanggang hatinggabi nagta-trial and error kami on site ng iba-ibang values para malaman kung ano ang best result (minsan hanggang hatinggabi sa tabi ng sementeryo sa probinsya na wala man lang kaming kakilala at wala pang mga ilaw Cheesy).
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« Reply #55 on: March 08, 2010, 01:58:46 PM »

salamas sa mga tugon nyo mga masters

@sis akhen

regarding trial and error ay mali po talaga yun

sinabi mo na kz na error eh

alam nyo po ba na ung trial na yan ang sanhi o dahilan kaya maraming ckt design na gumagana na ngayon? totoo na gawa ito ng isang engr designer pero bakit sandali lang ang buhay ay paktay na agad ang unit? sa palagay ba ay tama ang disenyo? kung tama ang disenyo bakit nasira agad?sa ganitong pangyayari ay busit na ang may ari sa kabibili ng parts base sa pagbabalik ng original design pero wa epek parin. ngayon kung gusto mo na paganahin ulit or irepair ung unit ay magiisip ka ngayon kung bakit ndi nagtagal ung orig na value,gagawa ka ngayon ng paraan para maitama ung kamalian na design ng tinagurian marunong sa disenyo.
dahil sa actual na pag iiisip ng mas subok mo ng materyales ay mapapagana mo ang kapalpakan ng disenyo. samakatuwid ay dahil sa isang inaakala ng mga marurunong sa technolohiya na maling practices ang tial method ay maling kahunghangan (sori sa word ko)at dapat sana sa ganitong sitwasyon ay magpasalamat pa ung ckt designer sa inaakala nyang bobong tech kz muling nabuhay ung unit dahil sa kanyang kapalpakan at sana ay gumawa pa sya ng paraan para ikorek ang kanyang pagkakamali pero dahil narin sa pride at pagmamalaki ay pilit nyang iiwasan ang ganun para narin sa kanyang katanyagan "kuno" at pilit na sasabihing mali ang trial na ginawa ng tech para pangalagaan lang ang kanyang reputasyon pero ang katotothanan ay nangyari na at dahil yan sa isang tech na pilt inaalam ang kasalukuyang katotohanan.

about sa mga technician na amplifier lang ang alam na isagot sa kung ano ang transistor
malamang ndi electronics tech un. baka pest technician po ang nakaharap nyo

at ndi po lahat ng tech ay galing lamang sa technical studies

 salamas po sa lahat ng tumugon sa thread na to at pagpalain tayo ng maykapal sa mundo ng electronics. hangad po namin ang katotohanan at ndi lang ung bolpen at papel


I you will argue with me na magaling, ka pwes, gusto mo magpresetahan tayo ng whitepapers regarding design?
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« Reply #56 on: March 08, 2010, 02:14:24 PM »

Now if somebody here will tell me na mas matino ang technician kaysa sa engineer, isa lang tanung ko, bakit ka technician at di ka engineer?

I came from a semiconductor company and encountered lots of technicians and engineers na mas maangas pa kaysa sa akin, kapag yung test technician nakikita namin may potential na ilagay sa engineering, nilalagay namin, yun yung technician na marunong mag-isip, gumawa at magtrouble shoot ng ATE's without even knowing the functional block diagram of the said ATE.

Pero yung mga panay dakdak lang, hayun, ang trabaho eh tagapalit lang gn cards sa ATE, taga tulak ng handler at taga -ayos ng wirings.

I think all of you get my point, there is a very large line between engineers and technicians, kaya nga may ENGINEER na title sa trabaho, at may TECHNICIAN na title. Kasi kung wala yan pinagkaiba, pwes eh di matagal ng palang palpak ang RANK and FILE system ng mga companies na ito and dapat bawiin ang Integrated Management Systems (ISO) Certificate ng mga ito.
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« Reply #57 on: March 08, 2010, 05:21:53 PM »

I will be locking this thread as all I can see are mere assumptions yade yadah..

Now, if you have a problem because I locked this thread, you can PM me.
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