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.

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.

"Tim" wrote in message
...


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.


Tim:

I can do it with two capacitors and a set of jumper cables. It is called a
"charge pump" which is a common type of electronic circuit for transferring
charge from a low potential to a high potential. The circuitry is explained
he

http://en.wikipedia.org/wiki/Charge_pump

The power inverter and charger will also work just fine. From this link:

http://www.batterystuff.com/tutorial_battery.html

You can see a discharged battery produces nearly 12 volts (says so in the
above link). The discharged battery just can supply high current at 12
volts, which is fine you just have to set the charger at trickle charge.

An inverter can operate on DC voltage inputs of of 10-15 as seen he

http://www.novaelectric.com/dc_ac_in...vacg12600w.php

So it will definitely work with a fully discharged 12v lead acid battery.


Steve

"Steve" wrote in message
...

"Tim" wrote in message
...


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.


Tim:

I can do it with two capacitors and a set of jumper cables. It is called a
"charge pump" which is a common type of electronic circuit for
transferring charge from a low potential to a high potential. The
circuitry is explained he

http://en.wikipedia.org/wiki/Charge_pump

The power inverter and charger will also work just fine. From this link:

http://www.batterystuff.com/tutorial_battery.html

You can see a discharged battery produces nearly 12 volts (says so in the
above link). The discharged battery just can supply high current at 12
volts, which is fine you just have to set the charger at trickle charge.

An inverter can operate on DC voltage inputs of of 10-15 as seen he

http://www.novaelectric.com/dc_ac_in...vacg12600w.php

So it will definitely work with a fully discharged 12v lead acid battery.


Steve



Heh.

Eisboch

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 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