Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 11-29-2018, 12:26 PM   #1
New Member
 
Join Date: Jan 2015
Posts: 3
Leese Neville question

My LN 12v 320amp 4890 Alt. Lists W AC / tp does that mean 120ac plug

nitwrm is offline   Reply With Quote
Old 11-29-2018, 12:32 PM   #2
Bus Geek
 
Join Date: Nov 2016
Posts: 2,775
please use whole words

if you are asking about mains power, no.

Alternators output DC.

You need an inverter to turn that into AC mains-type current, usually with a battery bank in between,
john61ct is offline   Reply With Quote
Old 11-29-2018, 12:39 PM   #3
New Member
 
Join Date: Jan 2015
Posts: 3
On the paper

That is how it was listed on the paper work if I knew what it stood for I wouldn’t have to ask
nitwrm is offline   Reply With Quote
Old 11-29-2018, 01:07 PM   #4
Bus Geek
 
brokedown's Avatar
 
Join Date: Dec 2016
Location: Weeki Wachee, FL
Posts: 3,056
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
The alternator produces AC current which is rectified to DC and regulated to the correct output voltage. it does not produce usable AC current, you'll need to use an inverter for that.
__________________
Keep up with us and our build!
Follow us on Facebook, Instagram, YouTube, and Twitter
brokedown is offline   Reply With Quote
Old 11-29-2018, 01:08 PM   #5
Bus Geek
 
Join Date: Nov 2016
Posts: 2,775
No I meant what it is you're asking, what you're trying to accomplish.

As far as the specs sheet or whatever, post a link to it if you want help deciphering.

Unless my answer was sufficient for you of course then never mind, happy to help.
john61ct is offline   Reply With Quote
Old 11-29-2018, 01:16 PM   #6
Bus Geek
 
brokedown's Avatar
 
Join Date: Dec 2016
Location: Weeki Wachee, FL
Posts: 3,056
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
I would also add that that is a VERY nice, VERY expensive alternator. In other words, do NOT mess with it because when you break it you'll be extremely sad.
__________________
Keep up with us and our build!
Follow us on Facebook, Instagram, YouTube, and Twitter
brokedown is offline   Reply With Quote
Old 11-29-2018, 01:19 PM   #7
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,751
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
from what i remember of those big alternatrors.. they simply bring the AC voltage out to terminals on it.. I was thinking it is actually "3 phase".. then they connect the internal regulator to thjos terminals... I have no idea what use that AC voltage is other than being rectified and regulated to DC.. since the rotational speed changes, its frequency would change.. which is a no-no for standard house-type current.



I think they sold those units like that so someone could install an external 24 volt regulator and draw 24 volts DC and 12 volts DC off the same alternator...



-Christopher
cadillackid is offline   Reply With Quote
Old 11-29-2018, 01:23 PM   #8
Bus Geek
 
Join Date: Nov 2016
Posts: 2,775
Also be aware will require special pulley ratio / very HD multi-vee belts, and eat a **lot** of horsepower when loads are pulling anywhere over 200A.

A quality external VR like Balmar MC-214 and excellent cooling airflow also helpful.

Otherwise, or even so, do not expect to get that max rating in actual output for long.

Especially with a big LFP bank, or loads like aircon, would be very easy to fry the alt.

A field current killswitch at the helm will be useful for overtaking or in the mountains.
john61ct is offline   Reply With Quote
Old 11-29-2018, 07:34 PM   #9
Bus Nut
 
Join Date: Jun 2015
Location: Asheville, NC
Posts: 347
Year: 1999
Coachwork: American Cargo 14'L x 7'8"W x 7'H Box
Chassis: Ford E350 Cutaway
Engine: 7.3L Powerstroke
Rated Cap: 11500 lbs
The reference to w/ AC in the alternator specs could refer to the vehicle having air conditioning which changes the mounting scenario for the alternator.

As others already pointed out, alternators create 3-phase AC current that is internally rectified to DC. Aside from the AC side being three phase, the voltage and frequency is also not suitable for your AC appliances. Furthermore, the internal AC frequency is rpm dependent. Some tachometers use this to display engine rpm and some alternators have a connector for the tachometer signal, which is another possibility of what your alternator specs could refer to.

Sadly, we have to go from an alternator (mechanical->AC->DC) via an inverter (DC->AC) to our AC appliances.
alpine44 is offline   Reply With Quote
Old 11-29-2018, 07:56 PM   #10
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,751
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
these larger leese neville alternators actually often have 3 AC terminals on the outside of the alternator... you'll usually see the wires connected to them that go off to the internal DC regulator that feets the Output terminal.. these are internally excited units.. so my thinking is that you could attach an external regulator to these 3 AC terminals (they are marked AC on the alternator).. say if you needed 24 volts for something.. some pf the larger transit busses have both 12 and 24 volt systems in them..... with an alternator like this you could draw both voltages from one alternator..

-Christopher
cadillackid is offline   Reply With Quote
Old 11-29-2018, 08:12 PM   #11
Mini-Skoolie
 
oldntired's Avatar
 
Join Date: Jun 2018
Location: clarksville, tn
Posts: 27
Year: 1999
Coachwork: Bluebird
Chassis: A3 FE
Engine: 5.9 Cummins
Rated Cap: 78 skinny butts YMMV
Quote:
Originally Posted by brokedown View Post
I would also add that that is a VERY nice, VERY expensive alternator. In other words, do NOT mess with it because when you break it you'll be extremely sad.
Googled it... hory spit! spendy!
oldntired is offline   Reply With Quote
Old 11-30-2018, 04:39 AM   #12
New Member
 
Join Date: Jan 2015
Posts: 3
Thanks

Thanks to all for information
nitwrm is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.