On Wed, 21 Nov 2007 13:48:30 -0800 (PST), Tim
wrote:



Steve wrote:
dh@. wrote in message ...
Someone told me it's possible to charge an inverter
system's batteries using a battery charger plugged
into the inverter that's being run by the batteries
you want to charge. Is there any truth to that, and
if so, how does it work?

If you have 2 half dead batteries it is possible to use them to juice up one
battery completely and leave the other dead.

I dont' even see how you could do that. with jumper cables? no.

with a power inverter and battery charger? no, (not really)

your "half dead" battery won't produce enough power to keep the
inverter AND battery charger up (ona 12v. system) 14v DC [+/-], at
least for any real length of time to charge the other "half dead"
battery. especially fully charged.


Hmmm...these days, there are boost regulators (step up) and buck
regulators (step down) and even buck/boost regulators, that can
produce a set voltage from a source that goes from higher to lower
than the target voltage.
And this leads to high efficiencies too.
I imagine an inverter system could have similar qualities.

Brian Whatcott Altus OK

Brian Whatcott wrote:
On Wed, 21 Nov 2007 13:48:30 -0800 (PST), Tim
wrote:


Steve wrote:
dh@. wrote in message ...
Someone told me it's possible to charge an inverter
system's batteries using a battery charger plugged
into the inverter that's being run by the batteries
you want to charge. Is there any truth to that, and
if so, how does it work?
If you have 2 half dead batteries it is possible to use them to juice up one
battery completely and leave the other dead.
I dont' even see how you could do that. with jumper cables? no.

with a power inverter and battery charger? no, (not really)

your "half dead" battery won't produce enough power to keep the
inverter AND battery charger up (ona 12v. system) 14v DC [+/-], at
least for any real length of time to charge the other "half dead"
battery. especially fully charged.


Hmmm...these days, there are boost regulators (step up) and buck
regulators (step down) and even buck/boost regulators, that can
produce a set voltage from a source that goes from higher to lower
than the target voltage.
And this leads to high efficiencies too.
I imagine an inverter system could have similar qualities.

Brian Whatcott Altus OK
Brian, I was stationed at Altus AFB back in the 50s and 60s. Helped Hoyt
Shaded mayor build a mobile home park out close to the base. Spent about
eight years there.

--
BILL P.
&
DOG

On Thu, 22 Nov 2007 20:50:03 -0600, williamboyd
wrote:


Brian, I was stationed at Altus AFB back in the 50s and 60s. Helped Hoyt
Shaded mayor build a mobile home park out close to the base. Spent about
eight years there.

There is a little park on one side of the city lake (formerly a city
water reservoir) named for Hoyt. Unusual name. Kids can pull 12 inch
fish out of that lake, if they can get past the geese and ducks -
though the recent bird flu issue has led the city to start scaring off
the birds there. There are surprizingly few military folks on base -
mostly aircrew students, served by a largely civilian staff.

Brian Whatcott Altus OK

Brian Whatcott wrote:
On Thu, 22 Nov 2007 20:50:03 -0600, williamboyd
wrote:


Brian, I was stationed at Altus AFB back in the 50s and 60s. Helped Hoyt
Shaded mayor build a mobile home park out close to the base. Spent about
eight years there.

There is a little park on one side of the city lake (formerly a city
water reservoir) named for Hoyt. Unusual name. Kids can pull 12 inch
fish out of that lake, if they can get past the geese and ducks -
though the recent bird flu issue has led the city to start scaring off
the birds there. There are surprizingly few military folks on base -
mostly aircrew students, served by a largely civilian staff.

Brian Whatcott Altus OK

During my short stay at Altus, they built the Atlas silos and closed
them down. I was Pad Chief for the Cache site. At that time I lived in
Hobart, drove all the way to the base changed my car for an AF vehicle
and drove all the way to the site. It was still dark when I left home in
the morning at Hobart and dark again in the evening when I returned
home. Seven days a week many times, little time off. Certainly was glad
when they let us convoy that missile to San Bernardino.
We used to go up to Lake Altus and water ski and fish, while they were
building the sites and after they shut them down.


--
BILL P.
&
DOG

On Fri, 23 Nov 2007 14:37:23 -0600, williamboyd
wrote:


During my short stay at Altus, they built the Atlas silos and closed
them down. I was Pad Chief for the Cache site. At that time I lived in
Hobart, drove all the way to the base changed my car for an AF vehicle
and drove all the way to the site. It was still dark when I left home in
the morning at Hobart and dark again in the evening when I returned
home. Seven days a week many times, little time off. Certainly was glad
when they let us convoy that missile to San Bernardino.
We used to go up to Lake Altus and water ski and fish, while they were
building the sites and after they shut them down.


The base commander or maybe missile squadron commander
from that era Dick Maffrey, retired here, and died 2 or 3 years ago.
Entrepreneurial. He set up a motel, a feeder air line, a bus transport
outfit, he built his house down the road from mine with his own hands
along with his wife and kids, and very nice it is. His wife is still
live and kicking.
I took a look at the silo north of the lake. It was half filled with
water - the silo lid was welded shut etc. Kinda spooky. I think
the Cache site that you mentioned, is on the road to Frederick,
south of the Altus-Lawton main drag. Is that the one?
The mueum here has a control console for one of the silos.

Brian W

Brian Whatcott wrote:
On Fri, 23 Nov 2007 14:37:23 -0600, williamboyd
wrote:


During my short stay at Altus, they built the Atlas silos and closed
them down. I was Pad Chief for the Cache site. At that time I lived in
Hobart, drove all the way to the base changed my car for an AF vehicle
and drove all the way to the site. It was still dark when I left home in
the morning at Hobart and dark again in the evening when I returned
home. Seven days a week many times, little time off. Certainly was glad
when they let us convoy that missile to San Bernardino.
We used to go up to Lake Altus and water ski and fish, while they were
building the sites and after they shut them down.


The base commander or maybe missile squadron commander
from that era Dick Maffrey, retired here, and died 2 or 3 years ago.
Entrepreneurial. He set up a motel, a feeder air line, a bus transport
outfit, he built his house down the road from mine with his own hands
along with his wife and kids, and very nice it is. His wife is still
live and kicking.
I took a look at the silo north of the lake. It was half filled with
water - the silo lid was welded shut etc. Kinda spooky. I think
the Cache site that you mentioned, is on the road to Frederick,
south of the Altus-Lawton main drag. Is that the one?
The mueum here has a control console for one of the silos.

Brian W

Colonel T. Robert Hall Jr. was the Commander of the 577th SMS when I was
there, and I was there for the full existence of the unit. Maffrey might
have been Base CO I do not remember, I remember Col Kise was wing co for
a while.
Cache site was close to the Lawton, we had another site at Frederick.
http://www.577sms.com/

But we did have some folks that made good.
http://www.af.mil/bios/bio.asp?bioID=7184
http://www.af.mil/bios/bio.asp?bioID=4615
There were several more.


--
BILL P.
&
DOG

"Brian Whatcott" wrote in message
...


Hmmm...these days, there are boost regulators (step up) and buck
regulators (step down) and even buck/boost regulators, that can
produce a set voltage from a source that goes from higher to lower
than the target voltage.
And this leads to high efficiencies too.
I imagine an inverter system could have similar qualities.

Brian Whatcott Altus OK

I've never heard of a buck, boost, or buck/boost regulator. There are
bucking, boosting and buck/boost transformers, but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Eisboch

"Eisboch" wrote in message
...

I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given time
period) is conserved.



Eisboch

"Steve" wrote in message
...

"Eisboch" wrote in message
...

I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given time
period) is conserved.



Eisboch



Interesting. If the power source is a 12 volt DC battery, what does this
regulator boost and how does it do it?

Eisboch

"Eisboch" wrote in message
...

"Steve" wrote in message
...


I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given
time period) is conserved.



Eisboch



Interesting. If the power source is a 12 volt DC battery, what does this
regulator boost and how does it do it?

Eisboch


My apologies. I didn't notice the link you provided.
It appears to be an inverter circuit and indeed can provide a DC boost.
However, it's not a perpetual power system and will still use more power
from a battery that it is trying to charge.

Eisboch