Today's Message Index:
----------------------
1. 08:19 AM - Re: BnC Continuous Duty Contactor 12 v (Joe)
2. 09:25 AM - Re: BnC Continuous Duty Contactor 12 v (Robert L. Nuckolls, III)
3. 01:25 PM - Re: Alternator part number? (Robert L. Nuckolls, III)
4. 04:16 PM - need a tool spec on vacation (Bill Boyd)
5. 06:15 PM - Re: need a tool spec on vacation (Allen Fulmer)
6. 06:24 PM - Re: I-Phone Inclinometer (Eric M. Jones)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: BnC Continuous Duty Contactor 12 v |
Jeff wrote:"I am using it as a battery contactor but with a Very High
out alternator, 200amps ..... So I am thinking I need to find a bigger
contactor ? or my other thought - guess was maybe to run TWO Stancor
70-902 contactors in parallel ? with the extra wires also... but concern
here is that something I haven't thought of will smoke something if both
are not closed ? Maybe I am overlooking a simple cheaper solution...."
Jeff,The size of the alternator has nothing to do with the current
rating of the battery contactor. The ampacity of the battery contactor
should be determined by the engine starting current and by the battery
charging current. These two currents are the only significant currents
normally flowing through the battery contactor. Even if you have a very
large load such as an electric cockpit heater, that current would flow
directly from the alternator to the heater without going through the
battery contactor. Just because the alternator is rated at 200 amps
does not mean that it will be supplying that much. The alternator will
only be putting out that current which is needed to operate the loads
that are turned on, most likely only a fraction of the alternator's
ampacity. I would use the same battery contactor regardless of the
alternator size.Joe Gores
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: BnC Continuous Duty Contactor 12 v |
At 11:16 AM 8/9/2008 -0400, you wrote:
>Jeff wrote:
>
>"I am using it as a battery contactor but with a Very High out alternator,
>200amps ..... So I am thinking I need to find a bigger contactor ? or my
>other thought - guess was maybe to run TWO Stancor 70-902 contactors in
>parallel ? with the extra wires also... but concern here is that something
>I haven't thought of will smoke something if both are not closed ? Maybe I
>am overlooking a simple cheaper solution...."
Interesting! Help us understand a bit more about
your proposed system. Under what conditions would
you expect your 200A alternator to deliver this
kind of power. In other words, what design goals
for the vehicle drove the selection of this size
machine?
>
>
>Jeff,
>
>The size of the alternator has nothing to do with the current rating of
>the battery contactor. The ampacity of the battery contactor should be
>determined by the engine starting current and by the battery charging
>current. These two currents are the only significant currents normally
>flowing through the battery contactor. Even if you have a very large load
>such as an electric cockpit heater, that current would flow directly from
>the alternator to the heater without going through the battery
>contactor. Just because the alternator is rated at 200 amps does not mean
>that it will be supplying that much. The alternator will only be putting
>out that current which is needed to operate the loads that are turned on,
>most likely only a fraction of the alternator's ampacity. I would use the
>same battery contactor regardless of the alternator size.
>
>Joe Gores
Joe is quite correct. The battery contactor must CARRY, not
SWITCH starting currents that include some bodacious inrush
currents. Then it must CARRY, not SWITCH the battery recharge
currents and/or expected battery discharge currents during
alternator-out operations. The 80-amp, lowly 70 series devices
have given good service. But let's be sure that we're not
giving you marginal advice. Do you also plan a big battery?
If the battery is "up-sized" in concert with a larger alternator,
then it follows that your system MIGHT be capable of extra-
ordinary stress on the battery contactor . . . like recharging
a big battery with you 200A energy source.
There are some up-sized contactors not the least of which
are the 586 series devices from Stancor.
http://aeroelectric.com/Mfgr_Data/Contactors/Stancor-WhiteRogers/Stancor_586-Series.pdf
. . . but we don't have enough information about your
design goals to make confident recommendations.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Alternator part number? |
At 05:27 PM 8/8/2008 -0500, you wrote:
><nuckolls.bob@cox.net>
>
>At 03:04 PM 8/8/2008 -0400, you wrote:
>>On the way back from Oshkosh to Florida my alternator died (lasted 2
>>years). Switched off the main bus and ran the E bus all the way home
>>(thanks Bob N.). It was a 35 amp externally regulated part
>>#14184. Anyone out there know what the part number is for the same type
>>of alternator except in 55 amp unit externally regulated?
>
> I'm wondering if that was originally an externally regulated
> unit. There's a lot of not terribly favorable traffic that
> comes up on a Google search about that part number as a Van's
> supplied alternator. There's a 'stock', probably internally
> regulated version offered on Ebay right now:
Followup: Another member on the List has turned me on to
the following website:
http://www.motorcarparts.com/catalog.htm
This link takes you to a YMME selection form that
may not be of much use in researching alternators.
However, stick anything in, like 2000 Honda Accord
with 2.3L engine. Then click on "alternator" for that
car.
This takes you to a cool screen that offers specs and
a 3-view for the alternator. Moreover, there's a box
on this page for inserting another part number.
Pun in your 14184 number and we get an
35A EXTERNALLY regulated ND alternator with three photographic
views.
Now we know a lot more about the alternator that started
this thread. We also know about an information resource
that many of you will find valuable in identifying
and perhaps integrating certain kinds of alternators
into your projects.
This website also offers a technical bulletin against
that alternator which speaks to the need to retain
the b-lead filter capacitor from your old alternator
when replacing it with a new one. It also identifies
the functionality the rear mounted receptacle.
Pretty cool stuff.
Bob . . .
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | need a tool spec on vacation |
I'm at the beach and Tower informs me my transponder has quit working
(again!) I am 99% sure from past trouble with this thing that I can fix it
by removing, cleaning and reinstalling the Garmin adapter in the Narco tray,
but need a foot-long Allen wrench to reach in there, and don't have it with
me. One can buy most anything at the beach these days, but I need the size
to look for at the hardware store: what is the dimension of the hex screw
that holds radios in avionics trays? 3/32"? Thanks for the help. I'm sure
they'll let me back out of the class D with an inop transponder, but it's
just not right having stuff not functioning.
-Stormy / Bill B.
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | need a tool spec on vacation |
3/32 is correct.
Allen
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Bill Boyd
Sent: Saturday, August 09, 2008 6:13 PM
To: rv-list@matronics.com; aeroelectric-list@matronics.com
Subject: AeroElectric-List: need a tool spec on vacation
I'm at the beach and Tower informs me my transponder has quit working
(again!) I am 99% sure from past trouble with this thing that I can fix it
by removing, cleaning and reinstalling the Garmin adapter in the Narco tray,
but need a foot-long Allen wrench to reach in there, and don't have it with
me. One can buy most anything at the beach these days, but I need the size
to look for at the hardware store: what is the dimension of the hex screw
that holds radios in avionics trays? 3/32"? Thanks for the help. I'm sure
they'll let me back out of the class D with an inop transponder, but it's
just not right having stuff not functioning.
-Stormy / Bill B.
Checked by AVG - http://www.avg.com
9:02 AM
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: I-Phone Inclinometer |
Or that Saint Christopher medal on a chain you hang from your compass now.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197619#197619
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|