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 08-13-2020, 02:18 PM   #1
Platinum Member
 
Join Date: Oct 2018
Location: QC
Posts: 151
Default Alternator cold and hot set points

My UHG description states that

The PROMASTER-280XP-SE g/u alternator uses a special internal voltage regulator ... has a set point of 14.7 volts cold and 14.2 volts hot if batteries are at full charge.

I know regulator have a set point but what are cold and hot set points? Are they related to the alternator temperature?
__________________
2019 Roadtrek Simplicity SRT
Yoshimura is offline   Reply With Quote
Old 08-13-2020, 03:12 PM   #2
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 11,918
Default

Quote:
Originally Posted by Yoshimura View Post
My UHG description states that

The PROMASTER-280XP-SE g/u alternator uses a special internal voltage regulator ... has a set point of 14.7 volts cold and 14.2 volts hot if batteries are at full charge.

I know regulator have a set point but what are cold and hot set points? Are they related to the alternator temperature?

No external regulator like a Balmar?


The alternator is a Nations but made by DC Power Engineering and is based on Denso designs. Our original upgrade was to a DC Power 250XP so it would have the same internal regulator as have, I am pretty certain.


The way ours behaved was similar to what DC Power had related to me. It was said to have 3 stages of turn down of the output, which was actually a change to the field voltage, but it also turned down the output voltage with the amps reduction. It did not start to taper off the output until over 250*F, measured at the laminations on the case, which is pretty hot. The output post (where a Balmar would measure), was small amount cooler most of the time. If not charging a lot of amps it didn't do the heat cutback, but did reduce the voltage output based on some internal algorithm, I think. Once we had driven over an hour, approximately, it would drop to about 14.3-14.4v of output and then periodically drop zero for a short time before turning back on and going back to 14.3-14.4v. This was apparently to check the system battery voltage to see if it needed further heavy charging at the high voltage. If I turned on the heater fan to full speed while it was off, it would come back on at 14.7v as it thought the battery was lower.


I always thought the 14.4-14.7 voltage was too high for long drives which could be on full batteries, so I got a lower voltage regulator from DC Power, that ran at about 14.4v initially and dropped to about 13.8v after a while, so much better for the batteries. I don't know if they still have that regulator available. Ours has been removed because we are no using the remote regulator setup, but it is around here someplace so it might have number on it.
booster 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. The time now is 11:07 AM.


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