Empathy List Archives

PG

Paul Goyette

Mon, Aug 4, 2003 12:51 PM

This should be an easy one, but I can't seem to find the answer online:

How do you convert/calculate battry AmpHours from either of these:

390 minutes Reserve Capacity @ 25 amps
110 minutes @ 75 Amps to 5.25V

Just trying to figure out how many AmpHours in my GolfCart batteries!

This should be an easy one, but I can't seem to find the answer online: How do you convert/calculate battry AmpHours from either of these: 390 minutes Reserve Capacity @ 25 amps 110 minutes @ 75 Amps to 5.25V Just trying to figure out how many AmpHours in my GolfCart batteries!

HW

Hal Wyman

Mon, Aug 4, 2003 4:48 PM

Well, 390 minutes at 25 amps would be 25390/60 amp-hours or 162.5
amp-hours.
110 minutes at 75 amps would be 75110/60 or 137 amp-hours.

The reason these numbers are different is that battery capacity is not
linear with load, i.e., if a battery will deliver 1 amp for 100 hours it
won't necessarily deliver 10]0 amps for 1 hour. Higher currents decrease
the total energy available from the battery. I believe batteries are
generally rated at below 25 amps, so that the first number would be a
conservative estimate of amp-hours.

-----Original Message-----
From: trawler-world-list-bounces@lists.samurai.com
[mailto:trawler-world-list-bounces@lists.samurai.com] On
Behalf Of Paul Goyette
Sent: Monday, August 04, 2003 5:51 AM
To: Trawler World List
Subject: TWL: Battery specification

This should be an easy one, but I can't seem to find the
answer online:

How do you convert/calculate battry AmpHours from either of these:

390 minutes Reserve Capacity @ 25 amps
110 minutes @ 75 Amps to 5.25V

Just trying to figure out how many AmpHours in my GolfCart
batteries! _______________________________________________
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Well, 390 minutes at 25 amps would be 25*390/60 amp-hours or 162.5 amp-hours. 110 minutes at 75 amps would be 75*110/60 or 137 amp-hours. The reason these numbers are different is that battery capacity is not linear with load, i.e., if a battery will deliver 1 amp for 100 hours it won't necessarily deliver 10]0 amps for 1 hour. Higher currents decrease the total energy available from the battery. I believe batteries are generally rated at below 25 amps, so that the first number would be a conservative estimate of amp-hours. > -----Original Message----- > From: trawler-world-list-bounces@lists.samurai.com > [mailto:trawler-world-list-bounces@lists.samurai.com] On > Behalf Of Paul Goyette > Sent: Monday, August 04, 2003 5:51 AM > To: Trawler World List > Subject: TWL: Battery specification > > > This should be an easy one, but I can't seem to find the > answer online: > > How do you convert/calculate battry AmpHours from either of these: > > 390 minutes Reserve Capacity @ 25 amps > 110 minutes @ 75 Amps to 5.25V > > Just trying to figure out how many AmpHours in my GolfCart > batteries! _______________________________________________ > http://lists.samurai.com/mailman/listinfo/trawler-world-list > > To Unsubscribe send email to > trawler-world-list-request@lists.samurai.com > Include the word "Unsubscribe" (and nothing else) in the > subject or body of the message. > > >

PG

Paul Goyette

Mon, Aug 4, 2003 5:34 PM

On Mon, 4 Aug 2003, Hal Wyman wrote:

Well, 390 minutes at 25 amps would be 25390/60 amp-hours or 162.5
amp-hours.
110 minutes at 75 amps would be 75110/60 or 137 amp-hours.

So, a battery bank with 5 series-pairs wired in parallel would have
~800AH at 25A draw?

And factoring in Pueckert's effect, it might well be close to 1000AH
at 20A...

OK, thanks!

On Mon, 4 Aug 2003, Hal Wyman wrote: > Well, 390 minutes at 25 amps would be 25*390/60 amp-hours or 162.5 > amp-hours. > 110 minutes at 75 amps would be 75*110/60 or 137 amp-hours. So, a battery bank with 5 series-pairs wired in parallel would have ~800AH at 25A draw? And factoring in Pueckert's effect, it might well be close to 1000AH at 20A... OK, thanks!

AJ

Arild Jensen

Tue, Aug 5, 2003 10:29 PM

Some grades of stainless steel still show rust stains after being exposed to
salt water moist air.

There is a product for household cleaning that removes calcium, lime, and rust
deposits from toilet bowls and bath tubs.
The active ingredient is phosphoric acid and glycolic acid.
I have had a lot of success in cleaning up this surface rusting and resultant
streaks on adjacent hull structures.

Not only can this remove the rust stains from SS metal fittings but the
phosphoric acid converts the iron oxide on plain black steel into a coating
that slows down further rusting.
This is a standard rust proofing process used in industry to prep mild steel
panels before priming and painting.
I am not aware of phosphoric acid being used for this purpose to any great
extent in the marine industry.

Would any of the list members have any information to add or to the contrary.

Regards
Arild

Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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Some grades of stainless steel still show rust stains after being exposed to salt water moist air. There is a product for household cleaning that removes calcium, lime, and rust deposits from toilet bowls and bath tubs. The active ingredient is phosphoric acid and glycolic acid. I have had a lot of success in cleaning up this surface rusting and resultant streaks on adjacent hull structures. Not only can this remove the rust stains from SS metal fittings but the phosphoric acid converts the iron oxide on plain black steel into a coating that slows down further rusting. This is a standard rust proofing process used in industry to prep mild steel panels before priming and painting. I am not aware of phosphoric acid being used for this purpose to any great extent in the marine industry. Would any of the list members have any information to add or to the contrary. Regards Arild --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/2003

A

Andina@yandina.com

Tue, Aug 5, 2003 11:02 PM

Phosphoric acid is used extensively for rust conversion, in particular in
the marine industry. It is sold under the trade name Ospho.

Andina Foster

Some grades of stainless steel still show rust stains after being exposed

to

salt water moist air.

There is a product for household cleaning that removes calcium, lime, and

rust

deposits from toilet bowls and bath tubs.
The active ingredient is phosphoric acid and glycolic acid.
I have had a lot of success in cleaning up this surface rusting and

resultant

streaks on adjacent hull structures.

Not only can this remove the rust stains from SS metal fittings but the
phosphoric acid converts the iron oxide on plain black steel into a

coating

that slows down further rusting.
This is a standard rust proofing process used in industry to prep mild

steel

panels before priming and painting.
I am not aware of phosphoric acid being used for this purpose to any

great

extent in the marine industry.

Would any of the list members have any information to add or to the

contrary.

Regards
Arild

Phosphoric acid is used extensively for rust conversion, in particular in the marine industry. It is sold under the trade name Ospho. Andina Foster > Some grades of stainless steel still show rust stains after being exposed to > salt water moist air. > > There is a product for household cleaning that removes calcium, lime, and rust > deposits from toilet bowls and bath tubs. > The active ingredient is phosphoric acid and glycolic acid. > I have had a lot of success in cleaning up this surface rusting and resultant > streaks on adjacent hull structures. > > Not only can this remove the rust stains from SS metal fittings but the > phosphoric acid converts the iron oxide on plain black steel into a coating > that slows down further rusting. > This is a standard rust proofing process used in industry to prep mild steel > panels before priming and painting. > I am not aware of phosphoric acid being used for this purpose to any great > extent in the marine industry. > > Would any of the list members have any information to add or to the contrary. > > Regards > Arild >

AJ

Arild Jensen

Wed, Aug 6, 2003 3:18 PM

I wonder if any of the list members who regularly charge their batteries in
the tropics know what kind of temperature their batteries reach internally
during the bulk charge stage.

Has anyone experimented with some sort of battery cooling system?

Regards

Arild

Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/2003

I wonder if any of the list members who regularly charge their batteries in the tropics know what kind of temperature their batteries reach internally during the bulk charge stage. Has anyone experimented with some sort of battery cooling system? Regards Arild --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/2003

A

Andina@yandina.com

Wed, Aug 6, 2003 3:30 PM

We sell quite a steady trickle of Vent Controllers to the "off the grid"
people for controlling a blower to cool and dry their rather large battery
banks. It only comes on when the battery voltage reaches about 14.1 volts
and it continues for an additional 45 minutes after charging stops. You can
see the specificatons at http://www.yandina.com/batVentInfo.htm
Andina Foster,
tech@yandina.com

I wonder if any of the list members who regularly charge their batteries

in

the tropics know what kind of temperature their batteries reach

internally

during the bulk charge stage.

Has anyone experimented with some sort of battery cooling system?

Regards

Arild

We sell quite a steady trickle of Vent Controllers to the "off the grid" people for controlling a blower to cool and dry their rather large battery banks. It only comes on when the battery voltage reaches about 14.1 volts and it continues for an additional 45 minutes after charging stops. You can see the specificatons at http://www.yandina.com/batVentInfo.htm Andina Foster, tech@yandina.com > I wonder if any of the list members who regularly charge their batteries in > the tropics know what kind of temperature their batteries reach internally > during the bulk charge stage. > > Has anyone experimented with some sort of battery cooling system? > > Regards > > Arild

A

Albin43SDtr@comcast.net

Wed, Aug 6, 2003 4:55 PM

Alrid, Andina and all,

I incorporated the Yandina Vent Controller into my setup to aid convection
cooling and venting of my battery box. I don't know how much it cools the
batteries (keeps them from heating up) as that would take instrumentation
and documentation, but the Freedom 3000 charger/inverter has never shut
down due to high battery temps, even though the area gets very warm in the
Florida sun. The fan controller has worked as advertised for the two years
or so it has been installed.

At 11:30 AM 08/06/2003 -0400, Andina@yandina.com wrote:

We sell quite a steady trickle of Vent Controllers to the "off the grid"
people for controlling a blower to cool and dry their rather large battery
banks. It only comes on when the battery voltage reaches about 14.1 volts
and it continues for an additional 45 minutes after charging stops. You can
see the specificatons at http://www.yandina.com/batVentInfo.htm
Andina Foster,
tech@yandina.com

Wayne
M/V Celestial
Albin43 Sundeck

Alrid, Andina and all, I incorporated the Yandina Vent Controller into my setup to aid convection cooling and venting of my battery box. I don't know how much it cools the batteries (keeps them from heating up) as that would take instrumentation and documentation, but the Freedom 3000 charger/inverter has never shut down due to high battery temps, even though the area gets very warm in the Florida sun. The fan controller has worked as advertised for the two years or so it has been installed. At 11:30 AM 08/06/2003 -0400, Andina@yandina.com wrote: >We sell quite a steady trickle of Vent Controllers to the "off the grid" >people for controlling a blower to cool and dry their rather large battery >banks. It only comes on when the battery voltage reaches about 14.1 volts >and it continues for an additional 45 minutes after charging stops. You can >see the specificatons at http://www.yandina.com/batVentInfo.htm >Andina Foster, >tech@yandina.com Wayne M/V Celestial Albin43 Sundeck

TE

Terry Etapa

Wed, Aug 6, 2003 6:36 PM

Original Post:

Phosphoric acid is used extensively for rust
conversion, in particular in
the marine industry. It is sold under the trade
name Ospho.

Andina Foster

Question:

What effects are there on wood from contact with
ospho?

Terry Etapa
M/V Pacific Glider
http://www.home.earthlink.net/~tetapa

Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
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Original Post: > Phosphoric acid is used extensively for rust > conversion, in particular in > the marine industry. It is sold under the trade > name Ospho. > > Andina Foster > Question: What effects are there on wood from contact with ospho? Terry Etapa M/V Pacific Glider http://www.home.earthlink.net/~tetapa __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com

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TWL: Battery specification

Arild