Diode replacment

[Paul Noisette]

Need to use a diode to prevent two batteries seeing each other when connected in parallel. Not wanting to drop .6v with the diode is there something like a Mosfet I could use which I believe will only drop the voltage .2v? Needs to be able to handle 30A and preferably 40A for safety factor. Is never used for more than 30 minutes at a time.

Many thanks in anticipation for your knowledgeable assistance.

Paul

 

[Phil Allison]

"Paul Noisette"

** Please do not post in HTML !!!!!!!!!!!!


Need to use a diode to prevent two batteries seeing each other when
connected in parallel. Not wanting to drop .6v with the diode is there
something like a Mosfet I could use which I believe will only drop the
voltage .2v? Needs to be able to handle 30A and preferably 40A for safety
factor. Is never used for more than 30 minutes at a time.


** You totally fail to decribe what you are after or for what actual
purpose - dickhead !!

From the large amp numbers you possibly are on about 12 volt car batteries
being operated in parallel.

If so - go see Jaycar.

http://www.jaycar.com.au/productView.asp?ID=MB3670

If not, then TELL US WHAT YOU ARE DOING !!!!



...... Phil

 

[Alan Rutlidge]

"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:7bt4umF1seo8eU1@mid.individual.net...

"Paul Noisette"

** Please do not post in HTML !!!!!!!!!!!!

Who says you dictate the posting rules Dipshit?

Need to use a diode to prevent two batteries seeing each other when
connected in parallel. Not wanting to drop .6v with the diode is there
something like a Mosfet I could use which I believe will only drop the
voltage .2v? Needs to be able to handle 30A and preferably 40A for safety
factor. Is never used for more than 30 minutes at a time.


** You totally fail to decribe what you are after or for what actual
purpose - dickhead !!

From the large amp numbers you possibly are on about 12 volt car
batteries being operated in parallel.

If so - go see Jaycar.

http://www.jaycar.com.au/productView.asp?ID=MB3670

If not, then TELL US WHAT YOU ARE DOING !!!!



..... Phil

 

[Paul Noisette]

2 100ah 12v batteries that are used independently of each other. To power
the invererter for short period with 280w on AC needs the batteries to be
paralled. With the batteries at differing states of charge dont want 1
battery attempting to charge battery 2. Realise that one battery will supply
more power till they equalise, but generally there is not much difference
between the batteries. However the batteries cannot be directly connected.

Since found this article
http://www.siliconchip.com.au/cms/A_103360/article.html

Going on that article I would need a P-channel Mosfet as the negative cannot
be isolated. In the Jaycar catalogue there is only a IRF9540N 100v 23A
http://www.jaycar.com.au/productView.asp?ID=ZT2467&keywords=ZT2467&form=KEYWORD
can these be placed in parallel to increase the current rating?
is there a higher powered P-channel Mosfet easily obtainable?
will the Mosfet need a heat sink?

Take it the Gate is the negative power for switching, the Source is the 12v
battery supply and the Drain is the power to the inverter. Is that correct?

Many thanks to those offering their help and expertise.

 

[Phil Allison]

"Paul Noisette"

** Now you are posting in mid air = no context visible and no refeences to
previous posts.

Says a lot about your thinking - or rather the lack thereof.

2 100ah 12v batteries that are used independently of each other.

** SLA ( ie gell cell) or wet cells or other kind ??

Leaving this info out is really stupid.

To power the invererter for short period with 280w on AC needs the
batteries to be paralled.

** Kindly state why.

Your Q may disappear with the correct answer.

With the batteries at differing states of charge dont want 1 battery
attempting to charge battery 2.

** This may be a false concern.

Realise that one battery will supply more power till they equalise, but
generally there is not much difference between the batteries. However the
batteries cannot be directly connected.

** Kindly state why.

Your Q may disappear with the correct answer.

Since found this article
http://www.siliconchip.com.au/cms/A_103360/article.html

** Purley reverse polarity protection for the load.

Something far better done with a relay and one, small diode.



....... Phil

 

[Paul Noisette]

Now we truly know who the dickhead is one Phil Alison
The dickhead knows no basic manners, knows even less about batteries than I
do. It matters not what type of battery. The battery is a power source and
type is completely irrelevant. Now know that Phil is the true dickhead of
aus.electronics. Phil Alison stop wanking yourself with two hands as affects
the 2 grey cells.

Why is irrelevant as you obviously know little to nothing about low voltage
and batteries.

All I want to do is drive the inverter from two batteries without directly
paralleling the power source - the 12v batteries.
If I have not explained myself carefully enough, please ask.

Phil Alison has been plonked no doubt like many others here would have done
to the dickhead.

Thanking you in anticipation.

 

[Phil Allison]

"Paul Noisette = Nauseating Turd "

( snip all this arsehole's stupid insults )


** Oh boy - is this cunthead asking for it !!

It matters not what type of battery.

** That is for us to decide - not a trolling fuckwit like you.

The battery is a power source and type is completely irrelevant.

** That is for us to decide - not a trolling fuckwit like you.

And you are repeating yourself - fuckwit !!

Why is irrelevant

** That is for us to decide - not a trolling fuckwit like you.

All I want to do is drive the inverter from two batteries without directly
paralleling the power source - the 12v batteries.

** You said that already - and REFUSE to say why !!!

If I have not explained myself carefully enough, please ask.

** I did - and more than once too.

Then like some RAVING NUT CASE TROLL

- you snipped the entire post and AGAIN posted in MID AIR.

What is clear, is that there IS no problem with paralleling the batteries.

The PROBLEM is ALL IN YOUR POINTY HEA D !!

Piss off.


...... Phil

 

[David]

Paul Noisette wrote:

Need to use a diode to prevent two batteries seeing each other when
connected in parallel. Not wanting to drop .6v with the diode is there
something like a Mosfet I could use which I believe will only drop the
voltage .2v? Needs to be able to handle 30A and preferably 40A for
safety factor. Is never used for more than 30 minutes at a time.

Many thanks in anticipation for your knowledgeable assistance.

Paul

Try this from Farnell. Make sure you use a big heatsink.


http://au.farnell.com/vishay-formerly-international-rectifier/80cpq020pbf/diode-schottky-2x40a-20v-to-247/dp/1013352


David

 

[Erik Vastmasd]

I caught a glimpse of "Paul Noisette" <noscammers@spam.com> on Sun, 12
Jul 2009 07:08:06 GMT, writing in aus.electronics:

Now we truly know who the dickhead is one Phil Alison
Phil Alison stop wanking yourself with two hands as affects
the 2 grey cells.

You have certainly sorted out Phil Alison, once the sheilas realise that
he uses two hands to wank himself he will probably have to avoid
answering his door or picking up the telephone. ;-)
--

Erik

 

[Phil Allison]

"Erik Vastmasd"


( snip insane abuse from another now nothing cunt )


** Is this scumbag WOG pig -

animal , mineral or vegetable ??

Or just something you accidentally step on,

curse and wipe you shoes off on the grass ??????




..... Phil

 

[Phil Allison]

"KR"

Trust me mate, some posts in recent months have clearly shown that
there are worse dickheads (call them what you may) on here than Phil.


** Am I being condemned here with faint praise ?????


Batteries have been paralleled in these sort of applications for
decades without problems, that is probably
why we need to know more about the application you need it for, as its
a very unusual setup you are asking about.


** The OP has his reason - but it is not ours to know.


I wouldn't advise putting anything in series with them, it will only
waste power and generate significant heat
at the sort of currents you are talking about.
With those sort of currents, you want as low a resistance as possible
in the cables, connectors fuses etc.


** Water off a dope's back - I fear.

Nice try at concilliation , anyhow




...... Phil

 

[KR]

On Jul 12, 5:08 pm, "Paul Noisette" <noscamm...@spam.com> wrote:

Now we truly know who the dickhead is one Phil Alison
The dickhead knows no basic manners, knows even less about batteries than I
do.  It matters not what type of battery.  The battery is a power source and
type is completely irrelevant.  Now know that Phil is the true dickhead of
aus.electronics. Phil Alison stop wanking yourself with two hands as affects
the 2 grey cells.

Why is irrelevant as you obviously know little to nothing about low voltage
and batteries.

oh boy.........

All I want to do is drive the inverter from two batteries without directly
paralleling the power source - the 12v batteries.
If I have not explained myself carefully enough, please ask.

Phil Alison has been plonked no doubt like many others here would have done
to the dickhead.

Trust me mate, some posts in recent months have clearly shown that
there are worse dickheads
(call them what you may) on here than Phil.

Thanking you in anticipation.

Batteries have been paralleled in these sort of applications for
decades without problems, that is probably
why we need to know more about the application you need it for, as its
a very unusual setup you are asking about.


I wouldn't advise putting anything in series with them, it will only
waste power and generate significant heat
at the sort of currents you are talking about.
With those sort of currents, you want as low a resistance as possible
in the cables, connectors fuses etc.

 

[David Eather]

Phil Allison wrote:

AHDDA0-7760AC-137FDF


( snip insane abuse from another now nothing cunt )


** Is this scumbag WOG pig -

animal , mineral or vegetable ??

Or just something you accidentally step on,

curse and wipe you shoes off on the grass ??????




.... Phil

I you had read Eric Vastmasd's post with an open mind you would have
seen it was not an insult to you but a jab at PN. Also, you response to
EV's post is raciest, which if it was done in a forum taken seriously in
Australia, might be not just actionable but also illegal. You have not
presented yourself in a flattering light and there is no one to blame
but yourself.

 

[Phil Allison]

"David Eather is a Wanker "

I you had read Eric Vastmasd's post with an open mind you would have seen
it was not an insult to you but a jab at PN.

** My god - that is just totally insane.

Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be
not just actionable but also illegal.

** Got news for you - fuckhead.

Calling some fuckwit troll who has just posted gratuitous personal abuse in
public forum a " WOG " is neither racist nor the slightest bit illegal.

Half witted, pig ignorant " net cops" like YOU can go drop fucking dead.




...... Phil

 

[KR]

On Jul 12, 10:22 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"KR"

Trust me mate, some posts in recent months have clearly shown that
there are worse dickheads (call them what you may) on here than Phil.

**  Am I being condemned here with faint praise   ?????

No, not condemned, I would explain it as - yes you are rude at times,
but I got used to it years ago, and unlike
some on this group, I don't really care about it, but on the other
side you do have knowledge of electronics (which is the purpose of
this group) unlike some on here.

Batteries have been paralleled in these sort of applications for
decades without problems, that is probably
why we need to know more about the application you need it for, as its
a very unusual setup you are asking about.

**  The OP has his reason  -  but it is not ours to know.

I wouldn't advise putting anything in series with them, it will only
waste power and generate significant heat
at the sort of currents you are talking about.
With those sort of currents, you want as low a resistance as possible
in the cables, connectors fuses etc.

** Water off a dope's back  -   I fear.


Yes, as I see more and more these days, efforts with many people are

futile, better off saving energy
for something else. This can get so frustrating. For example, trying
to show someone how to do something, being constantly interrupted,
asked irrelevant stupid questions that break concentration, and then
having them go
off and do the job some wrong way that doesn't work, and you have to
go in and clean up the mess afterwards.

 Nice try at concilliation , anyhow

.....  Phil

 

[David Eather]

Phil Allison wrote:

"David Eather is a Wanker "

I you had read Eric Vastmasd's post with an open mind you would have seen
it was not an insult to you but a jab at PN.

** My god - that is just totally insane.


Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be
not just actionable but also illegal.


** Got news for you - fuckhead.

Calling some fuckwit troll

"Fuckwit troll" is fine

who has just posted gratuitous personal abuse in

public forum a " WOG "

The word "wog" has a long history as a word of racial abuse (the target
race has even changed over time)

is neither racist nor the slightest bit illegal.

They are called the racial vilification laws

Half witted, pig ignorant " net cops" like YOU can go drop fucking dead.

Ah good, no racist terms. I just wanted to show you what you look like
to others, which is very poor. I did not insult you

EV also did not insult you. The comment from EV was sent to PN and I
quote it below

"You have certainly sorted out Phil Alison, once the sheilas realise that
he uses two hands to wank himself he will probably have to avoid
answering his door or picking up the telephone. ;-)"

The word "you" in the above refers to PN. PN tried to insult you but
instead inferred that you were a huge, manly stud, who every woman would
be after now that this is known.

I'm sorry you found that offensive.

 

[Phil Allison]

"David Eather is a FUCKING Wanker "

I you had read Eric Vastmasd's post with an open mind you would have
seen it was not an insult to you but a jab at PN.

** My god - that is just totally insane.

Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be
not just actionable but also illegal.


** Got news for you - fuckhead.

Calling some fuckwit troll who has just posted gratuitous personal abuse
in
public forum a " WOG " is neither racist nor the slightest bit illegal.

They are called the racial vilification laws

** You are talking absoute CRAP !!

You know ABSOLUTELY nothing about the law.

Half witted, pig ignorant " net cops" like YOU can go drop fucking
dead.

Ah good, no racist terms.

** Tell me what nationality you come from and I promise to oblige.

I did not insult you

** Of course you did - you FUCKING IMBECILE !!!

EV also did not insult you.

** You must be UTTERY INSANE !!!

The comment from EV was sent to PN and I quote it below

"You have certainly sorted out Phil Alison, once the sheilas realise that
he uses two hands to wank himself he will probably have to avoid
answering his door or picking up the telephone. ;-)"

The word "you" in the above refers to PN.

** So ??????????????????

The rest is nothing short of gross and gratiutous personal abuse.

Are you fucking BLIND ?????

I'm sorry you found that offensive.

** I find pig ignorant SCUMBAGS like you completely offensive.

How can anyone as STUPID as this autistic cunt get a job ??

Must be a public servant - I bet.



...... Phil

 

[Phil Allison]

"David Eather is a FUCKING Wanker "

I you had read Eric Vastmasd's post with an open mind you would have seen
it was not an insult to you but a jab at PN.

** My god - that is just totally insane.

Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be
not just actionable but also illegal.

** Got news for you - fuckhead.

Calling some fuckwit troll who has just posted gratuitous personal abuse in
public forum a " WOG " is neither racist nor the slightest bit illegal.

Half witted, pig ignorant " net cops" like YOU can go drop fucking dead.

Go back to your STUPID code scribbling -

you vile, autistic PIG.




...... Phil

 

[David Eather]

Phil Allison wrote:

"David Eather is a FUCKING Wanker "

I you had read Eric Vastmasd's post with an open mind you would have seen
it was not an insult to you but a jab at PN.

** My god - that is just totally insane.


Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be
not just actionable but also illegal.


** Got news for you - fuckhead.

Calling some fuckwit troll who has just posted gratuitous personal abuse in
public forum a " WOG " is neither racist nor the slightest bit illegal.

Half witted, pig ignorant " net cops" like YOU can go drop fucking dead.

Go back to your STUPID code scribbling -

you vile, autistic PIG.




..... Phil

Phil,

It seems that by accident you snipped the quote post that put it all in
context. An accident to be sure and not to worry, I've put it back in.
EV's quote and my comment is below:


/quote
"You have certainly sorted out Phil Alison, once the sheilas realise that
he uses two hands to wank himself he will probably have to avoid
answering his door or picking up the telephone. ;-)"

The word "you" in the above refers to PN. PN tried to insult you but
instead inferred that you were a huge, manly stud, who every woman would
be after now that this is known.

I'm sorry you found that offensive.
/end quote

If you would just say why you find being identified as a well "equipped"
man so offensive, perhaps someone can help and those of us who can't can
avoid this sensitive area of yours.

 

[Phil Allison]

"David Eather is an autistic PIG "

I you had read Eric Vastmasd's post with an open mind you would have seen
it was not an insult to you but a jab at PN.

** My god - that is just totally insane.

Also, you response to EV's post is raciest,

** Really ??

Cos of the one word " wog " ??

More insanity.

which if it was done in a forum taken seriously in Australia, might be not
just actionable but also illegal.

** Got news for you - you stupid, autistic fuckhead

Calling some fuckwit troll who has just posted gratuitous personal abuse in
public forum a " WOG " is neither racist nor the slightest bit illegal.

Half witted, pig ignorant " net cops" like YOU can go drop fucking dead.

Go back to your STUPID code scribbling -

you vile, autistic PILE OF SHIT !!



...... Phil