Looking for a UPS Design That Doesn't Overheat Batteries

[Roy L. Fuchs]

Yes it does - winding resistance is less.

No, it doesn't. Winding resistance is ONLY less for the first second
or so of operation. From that point on, the wires are hot, and the
ambient temperature of the surroundings don't mean dick, dickhead.

The difference is small when
the battery internal resistance is large compared to the starter winding
resistance, but it is not zero nor negative!

It is also NOT a factor once the wires have heated, and they will
virtually immediately.

 

[Roy L. Fuchs]

Can you supply data of bearing lubricants making the task more difficult
to an extent outweighing the winding resistance decreasing as temperature
decreases? I suspect NOT! Not only because of shortage of measurements,
but also from winding resistance likely allowing 10's of watts more power
input when 10 degrees colder while any lubricant viscosity loss increase
is probabably about or over an order of magnitude less!

Are you so stupid that you are unfamiliar with multi-graded oils?
Well known established fact that cold weather starts require more
starter energy.

Oh, and yes, oil IS a bearing lubricant. Car engines are equipped
with journal bearings, and a cold start most certainly requires more
horsepower to achieve for everything from pumping the oil to getting
it to be mobile in between the bearing surfaces.

Try again.

 

[Roy L. Fuchs]

I'm not exactly disagreeing with you (cranking for more then 10 seconds
would concern me if you didn't give the starter a break between tries),
but the op was talking about a STALLED starter. Whether or not this is
good for the starter I don't know, what I do know is it's pretty pointless
since a stalled starter has no chance of starting the engine, and you're
simply wasting energy by doing so.

TTYL

But... but... but... he was warming up his battery!

Hahahahaha!

 

[Roy L. Fuchs]

I would take a chance at

Your crap is not even worth answering.

Dead shorting a -40 battery or even a zero F battery is NOT going to
"warm it" enough to make a subsequent short pass more current.

GET A CLUE!

 

[Roy L. Fuchs]

Info relevant to here is lacking, although it does give fair chance that
this could be someone other than the one of junior-highschool mentality
that looked good mainly when his opponent was the infratroll sufficiently
famous to get his own FAQ!

I hope you disclaim to be either of these offenders!

Can you be any more retarded today?

 

[Roy L. Fuchs]

Ever hear of copper's resistance being fairly close to proportional to
absolute temperature?

Ever hear of current heating a conductor? The ABSOLUTE temperature
of the wire will be VERY HIGH once it begins passing current. So much
so that it negates any claim of the experiment's setting being
different.

In other words... NO, one does NOT get a benefit from cold weather
at the starter motor. The wires HEAT UP practically immediately.

You do know what the word HEAT means, right?

 

[Roy L. Fuchs]

Lubricant requiring a watt or two or maybe a fraction of a watt more
mechanical energy to overcome thickening thereof in a motor whose windings
ahave conductivity increased sufficiently to let in 10's of watts?

You need to let something in to your brain. Like rational thought.

 

[Roy L. Fuchs]

What does your argument have to do with the hardening point tyhat you
were supposedly responding to?

What makes you think that I have any faith in his claim at all? He
did not show any numbers from the CRC or any other source.

As far as I am concerned, until he does, a hardened bearing will
shrink less than a regular machined steel ball would.

 

[Roy L. Fuchs]

Either find another point to argue on or support contentions that you
are the "dungmanure" complained about in the past.

You're a goddamned retard. You were then, and you still are now, so
shut the **** up, jackass.

 

[Roy L. Fuchs]

Wanna bet?

I cannot believe the lack of real world physics knowledge some of
these folks exhibit.

Hell, half of this stuff is part of the basic set of trainings given
to auto mechanics, much less engineers.

How many decades have we known that a seized starter causes
catastrophic failure of the motor unless the power is removed from it?

How many decades have we known that a dead short across an
automotive battery is a *VERY* bad thing to do?

It is a shame that these guys do not know the extent of your
experience with lead acid batteries. Much less cold weather car
starting. :-]

I happen to know that you have more than a decade worth. :-]

I won't speculate on how many decades...

 

[Floyd L. Davidson]

It is a shame that these guys do not know the extent of your
experience with lead acid batteries. Much less cold weather car
starting. :-]

I happen to know that you have more than a decade worth. :-]

I won't speculate on how many decades...

4

 

[[email protected]]

... consider that by doing this the pair of pliers weld themselves onto
the connections, a car battery pumping hundreds if not thousands of amps
through a pair of pliers uncontrolled would cause me to run.

As the battery temp rose 7 F?

Nick

 

[[email protected]]

Are you so stupid that you are unfamiliar with multi-graded oils?
Well known established fact that cold weather starts require more
starter energy.

You are changing the subject.

Nick

 

[[email protected]]

Dead shorting a -40 battery or even a zero F battery is NOT going to
"warm it" enough to make a subsequent short pass more current.

But it will still explode from its internal energy, right?

Nick

 

[Roy L. Fuchs]

As the battery temp rose 7 F?

Which is NOT enough to make ANY difference in the CCA capacity of
the battery.

It is also a bogus claim. An IR camera pointed at such a battery
would see no change in a five second dead short pliers application at
any point other than the pliers themselves.

A ten second dead short.. not much more, if any.

After that, we are talking about depleting the battery beyond any
gains offered by warming the damned thing.

Again... D'oh!

 

[Floyd L. Davidson]

But it will still explode from its internal energy, right?

No it will not. Stop making up straw men to beat up on.

There *will* be sparks. There *will* be excessive heat from the
current through the tool used to short the battery.

Either of those can cause hydrogen gas to explode. Either can
also cause gasoline, oil, or other flamable material in the
engine compartment to catch fire.

These are not common experiences, but they *do* happen and can
be extremely harmful to individuals close by.

 

[Roy L. Fuchs]

You are changing the subject.

Nope. A bearing is a bearing. A cold bearing is a cold bearing.

It IS established fact that cold "wet" style bearings are harder to
move.

Do you deny this fact? If so, you need to go back to school, though
I would (and do) doubt that you have any mechanical engineering under
your belt to begin with.

 

[Roy L. Fuchs]

But it will still explode from its internal energy, right?

What? The battery I am familiar with exploding, the one I mentioned,
was NOT in a -40 F setting, dumbass.

 

[Floyd L. Davidson]

A ten second dead short.. not much more, if any.

After that, we are talking about depleting the battery beyond any
gains offered by warming the damned thing.

Depleting the battery Hell! We are the talking about depleting the
pliers and the person holding them... ;-)

 

[Roy L. Fuchs]

Depleting the battery Hell! We are the talking about depleting the
pliers and the person holding them... ;-)

Hehehehe... I just posted in abse a post to the frogtard that would
apply to some of the folks in this thread as well.

It is from our illustrious governator... :-]

Depleting a Usenet poster (cold or hot) is a hard thing to do, even
with the best conductors placed across their terminals. ;-]

And corpses are hard to warm up in this manner as well...

Where's a good, well placed lightning strike at when you need one?