nuckollsr(at)cox.net
Guest
|
 Posted: Sun Jan 15, 2006 9:21 am Post subject: Alternator for RV |
 |
|
At 07:50 PM 1/14/2006 -0500, you wrote:
| Quote: |
Armed with info gleaned from the AeroElectric list and elsewhere on the
web, I went alternator-shopping at the local auto parts stores today, to
see how close I could get to the recommended 70 A machine that goes by
part number Lester 13353 or NipponDenso 121000-346. If I had not had the
additional tidbit that it fits a '93 Dodge Ramcharger 5.2 liter pickup, I
think the parts counter clerks would have been helpless to assist me. The
choices that came up "in stock" were limited to one: the Dodge's optional
90 amp externally-regulated machine (reman) with a serpentine pulley, in a
125mm case. My quest for a VR-166 Ford regulator also ended with a
substitute, the Sorensen VR-301.
The alternator comes with its own computer-generated test output graph and
data table, indicating it is capable of 126 amps at 6000 rpm, and draws
5.72 amps of field current at that output.
|
The plain-vanilla regulators are generally set up
for 3A fields. I don't know if VR-166 style regulators
will handle this load but it would be easy to test for.
Since they're switching regulators, the added heat dissipation
may well be within SOME regulator's capabilities but some
caution is called for.
| Quote: | It seems to weigh about 11 lbs on the bathroom scales. Already I'm
thinking this might be more of a fire-breathing machine than I should
bolt to my RV, even if it's a physical fit, which I think it will
be. I'm not sure the electronic regulator will necessarily "handle" it,
but not sure why it wouldn't. I don't need anywhere near the output this
alternator is capable of, and I don't want my 5 amp field breaker
nuisance-tripping because the field happens to want near that amount (no
idea how linear the field current vs output curve might be, so no way to
know field current at closer to 50-60 amps, for example.)
Finally, I'm unsure how easily the V-pulley from my original Van's 35 A
machine will slip onto the shaft of the new alternator. Any takers on
that one? When I make the swap, I'd like to have everything go smoothly
with a minimum of downtime. Basically, I'd like some reassurance that
this is worth trying. I can always take it back and order the Dodge 70
amp alternator; same physical size, and ironically more money.
|
The question that comes to mind is do you NEED that
much snort? There are tens of thousands of certified
singles flying around with 60A alternators that are
greatly oversized to the task . . . not too big a deal
if volume driven cost is the decision driver (Cessna
used the same alternator on C150 through C210 for
a period of time).
However, if size and weight are drivers, then there
are lighter and less expensive alternatives that
may well provide all the snort you need. Better yet,
they're easier to find and there's a variety of
sources for mounting brackets that will fit your engine.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
