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how to use pc power supply to charge 40A Battery ?

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janosandi

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Wht to change in the power supply to charge 12 v 40A battery??
 

Re: how to use pc power supply to charge 40A Batter ?

what sort of supply you are considering a ac or dc supply

the data given very low to answer your question
 

Re: how to use pc power supply to charge 40A Batter ?

This power supply will charge your battery only up to 12 volts and not to a recommended 14.2 volts, as the maximum output voltage of a PC supply is 12 volts. You may need to re-adjust the output voltage to 14 volts if possible and the power supply adjustment allows to.
 

Re: how to use pc power supply to charge 40A Batter ?

janosandi said:
Wht to change in the power supply to charge 12 v 40A battery??
Click to expand...

For 40A from PC PSU on 12V rail, PC PSU should be stronger 750W (60eur-150eur), 1KW (200eur-500eur) or maybe 2KW (800eur and up), plus you need to make some modifications or to make some voltage boosters, all of this sum of sums :-?.

For that money you can buy new profy bat charger in market.

Dont skip standard tranformer. Standard trafo is best for that job if you making for your needs. If trafo is to heavy for you then eat more spinach. :) One battery or several which needs 40A of current for charging is to much heavy to be moved around, this give us question why to use switcher instead trafo ? Torus trafo 800W is enought for this job and he have around 6kg (60eur new).

I have impression that on EDABoard people have "SMPS mania disease" and they dont know when to use switching and when regular parts. All can be done on any way, and all is possible, but design should be simple and effective.

:wink:
 
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Re: how to use pc power supply to charge 40A Batter ?

thx for ur replys
how to adjust the 12v to 14 v Mr Raza?
 

Re: how to use pc power supply to charge 40A Batter ?

since both are dc voltages you may use a dc dc converter to boost your voltage op
 

Re: how to use pc power supply to charge 40A Batter ?

need simpler method to do that how to readjustthe 12v to 14.1 ?
 

Re: how to use pc power supply to charge 40A Batter ?

for simpler solution i dono wether one exist

just this is one possibility try to put a 2 V battery in series after the 12V op
i dono much about the feasability of it and i may be wrong

this is an alternative anyway dc dc converters are very simple
 

Re: how to use pc power supply to charge 40A Batter ?

someone told me i can redadjust the 12v anyway if anyone have an idea will b great
 

Re: how to use pc power supply to charge 40A Batter ?

Just search EDABoard forum, recently we have thread about that, I post several examples PC PSU to 13,8V-14,4V. There is no point to duplicate threads.

By the way what battery you will try to charge at 40A ?

You know that lead acid will pull high current from charger specially when starting to charge empty battery you need to limit current somehow, or PC PSU will shutdown or you will have fire. Fire or shutdown depends from which China factory is made that PSU. :)
 

Re: how to use pc power supply to charge 40A Batter ?

tpetar said:
Just search EDABoard forum, recently we have thread about that, I post several examples PC PSU to 13,8V-14,4V. There is no point to duplicate threads.

By the way what battery you will try to charge at 40A ?

You know that lead acid will pull high current from charger specially when starting to charge empty battery you need to limit current somehow, or PC PSU will shutdown or you will have fire. Fire or shutdown depends from which China factory is made that PSU. :)
Click to expand...

the battery is 40A battery all i need is morethan 4 amps i think
i wil look about the thread
thx
 

Re: how to use pc power supply to charge 40A Batter ?

janosandi said:
the battery is 40A battery all i need is morethan 4 amps i think
i wil look about the thread
thx
Click to expand...

Is this some joke ? 8-O

Your thread starts with :

Wht to change in the power supply to charge 12 v 40A battery??
Click to expand...

You forget to tell us that battery is 12V 40Ah not 40A of charging current !!!!!!!!

40A and 40Ah is granny and frogs. :roll:

If you have 40Ah battery you can charge it with 4A current. This job will do any functional PC PSU with some voltage buster, plus you need current limiter to 4A.
 
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Re: how to use pc power supply to charge 40A Batter ?

I have impression that on EDABoard people have "SMPS mania disease" and they dont know when to use switching and when regular parts. All can be done on any way, and all is possible, but design should be simple and effective.
Click to expand...

tpetar, please avoid such comments, as every one here share his/her own experience and tries to guide the help seeker.

thx for ur replys
how to adjust the 12v to 14 v Mr Raza?
Click to expand...
janosandi, it depends upon your power supply under use, whether it has and adjustment or not. If it is not already in the circuit embedded facility then it may be bit difficult to do it without having enough knowledge of the computer PSUs. (Thats my assumption, you may be having enough knowledge about it).
There are some threads here on the forum how to modify the PSU for the need, please search.
 

Re: how to use pc power supply to charge 40A Batter ?

as every one here share his/her own experience and tries to guide the help seeker.
Click to expand...

Yes, Raza that is the point, people should learn that anything can be done on many different ways, but which way to choose for design? We all intend to help other I dont see problem in that. Help can be even to direct him to right direction of thinking. You should read previous posts, you skip something, original post say to charge 12V 40A he didnt say 40Ah of battery capacity, I mean on that, but if you mean that this is easy to make PC PSU to give 40A on 12V rail then ok. :wink:
 

Re: how to use pc power supply to charge 40A Batter ?

you skip something, original post say to charge 12V 40A he didnt say 40Ah of battery capacity
Click to expand...

I was able to pick what he meant and was right on my assumption.
 

Re: how to use pc power supply to charge 40A Batter ?

Raza said:
I was able to pick what he meant and was right on my assumption.
Click to expand...

You want to say you know from begining that 40A is 40Ah, and that 40A is not current of charging ?

Then I must apologise I wrongly understand units A and Ah. I always mean that Ah is battery capacity and A is current flow.


@Janosandi

Here is existing thread about this problematic you can see examples how to modify PC PSU to get higher voltage then 12V:

charging a car battery with computer power supply
https://www.edaboard.com/threads/263088/

Will be nice to see some concrete assistance, not just posting posts and receiving points. I want to say we are at #18 post and we are like on beginning.


Converting Computer Power Supplies (PSU) to stabilized 13.8 V DC 20 A
https://elektronikbasteln.pl7.de/converting-computer-power-supplies-to-stabilized-138-v-dc-20-a.html

+13.5V 14Amp cont. 20 A for 20 sec.
https://www.webx.dk/oz2cpu/radios/psu-pc1.htm


:wink:
 
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Re: how to use pc power supply to charge 40A Batter ?

hi,
to modify pc PSU you need to search a voltage divider around the 12 v output (or 5 v output). This voltage divider feeds some voltage beck to an IC placed somewhere close to the region you searched. By modifying the values of the resistors of the divider you can go up to 14 V if the unit does not have an over voltage protection stage (if it has, you have to deactivate it ... it is better to get an other pc psu without that...).
Be careful when modifying the resistors from the voltage divider, if open loop appears between output of the divider and the supply of the divider (i mean the superior resistor), risc of electric shock may appear (the Ic which get's the voltage signal thru this voltage divider from the output of the PSU, does not see the output voltage anymore -doe to the open loop-, and gives high gain to its next stage ..............beside the voltage regulator loop it may have a current regulator loop to..........)
About the charging current it is about ~ 4 A .
A safe alternative would be to make a traditional battery charger with transformer ..... it cost's a little, it's heavy but work's fine . The pc PSU is a cheap alternative ( I use it to :wink: ) , and you need to take care of the charging current, if to high , the PSU can deactivate (the cooler stops) It is indicated to measure that current to get an idea about the status of your battery.....
 

Re: how to use pc power supply to charge 40A Batter ?

I'd say it's not safe and a bit unpractical to charge a battery with a modified computer power supply. No one here has even bothered to ask what kind of battery he is attempting to recharge.
 

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