Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 22-08-2023, 16:28   #241
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 15,167
Re: DC to DC charger - not needed for boats with proper alternators.

The fact that it has been running well is promising, but I am still puzzled why you have unplugged the alternator temperature sensing wire. This is a safety mechanism to prevent the alternator overheating. Like any safety mechanism it may only be triggered rarely, but it is still nice to have.
noelex 77 is online now   Reply With Quote
Old 22-08-2023, 17:33   #242
Registered User

Join Date: May 2006
Posts: 1,353
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by noelex 77 View Post
The fact that it has been running well is promising, but I am still puzzled why you have unplugged the alternator temperature sensing wire. This is a safety mechanism to prevent the alternator overheating. Like any safety mechanism it may only be triggered rarely, but it is still nice to have.
I plugged it back in now, but it doesn’t do anything as the temp parameter is set high. I only bought the temp cable as I was worried about the Lifepo4.
Fuss is offline   Reply With Quote
Old 22-08-2023, 17:55   #243
Senior Cruiser
 
newhaul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,741
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by Fuss View Post
I plugged it back in now, but it doesn’t do anything as the temp parameter is set high. I only bought the temp cable as I was worried about the Lifepo4.
I'm sure you said before but what brand of batteries did you install?
__________________
Non illigitamus carborundum
newhaul is online now   Reply With Quote
Old 22-08-2023, 18:03   #244
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 15,167
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by Fuss View Post
I plugged it back in now, but it doesn’t do anything as the temp parameter is set high. I only bought the temp cable as I was worried about the Lifepo4.
Plugging it back in is a good move. It will presumably kick in and reduce, or eventually kill the output if the alternator runs hotter than normal. This is important, especially when you are pushing the envelope.

If you think the temperature is set too high and this protective function may not work, the temperature limit for the regulator can usually be easily adjusted.
noelex 77 is online now   Reply With Quote
Old 22-08-2023, 19:24   #245
Registered User
 
Simi 60's Avatar

Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,651
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by Fuss View Post
That’s true, the reason I don’t want to change anything is that it has been working this way for a long time and has not burnt out the alternator and so I’m leaving it as it is. Partly as a test.
There is one difference however, and that is that the old batteries were lead acid and the new are Lifepo4.
However the alternator put out full power for more than an hour with this setup and it does the same with the Lifepo4.
I believe that if an alternator puts out full output with lead acid for an extended period, then with Lifepo4, then it will not be more stressed…however many forum members have a different opinion so this might have to be a separate thread to shoot down this myth.
Since when has a bit over an hour been an extended period?

Our 840ah @ 24v battery bank takes how long to fill at 50 to 70amps in?
Simi 60 is offline   Reply With Quote
Old 22-08-2023, 19:36   #246
Registered User
 
sailingharry's Avatar

Join Date: Jun 2009
Location: Annapolis, MD
Boat: Sabre 34-1 (sold) and Saga 43
Posts: 2,671
Re: DC to DC charger - not needed for boats with proper alternators.

I think that the distinction is not the difference between 1 hour and the 10 hours it would take to fill your bank. Rather, it is a response to those that say that LFP will kill an alternator because with lead, the alternator does not run at full output before the battery hits acceptance (hogwash). If an alternator is at max output (appropriately dialed down by regulator to control temp) for an hour, it has reached steady state. All internal parts are at peak operating temp, and further run time is more of the same.
sailingharry is offline   Reply With Quote
Old 23-08-2023, 07:29   #247
always in motion is the future
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 19,799
Re: DC to DC charger - not needed for boats with proper alternators.

Simply lower the temperature setting in the regulator to see if it works.
__________________
“It’s a trap!” - Admiral Ackbar.

s/v Jedi is offline   Reply With Quote
Old 23-08-2023, 07:36   #248
Senior Cruiser
 
newhaul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,741
Re: DC to DC charger - not needed for boats with proper alternators.

Iirc fuss is running Battleborn batteries. Their bms is specificly only allowing for 100amps charging . So a 150 amp alternator is only running at 60% approx of its potential output.
This would easily explain his numbers .
Unlike tho see of us running banks we built ourselves. My little 250ah would likelybcook his alternator as it will accept up to 300 amps charging. ( bms controlled) .
__________________
Non illigitamus carborundum
newhaul is online now   Reply With Quote
Old 23-08-2023, 07:47   #249
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 15,167
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by newhaul View Post
Iirc fuss is running Battleborn batteries. Their bms is specificly only allowing for 100amps charging . So a 150 amp alternator is only running at 60% approx of its potential output.
This would easily explain his numbers .
The charge limit of 50A or 100A (for emergency situations) applies to each Battleborn 100Ahr battery.

If the battery bank has more than one battery in parallel, the total charge current will be additive (or close to additive). So, for example, a 400Ahr bank would accept 200A (or 400A in an emergency) of charge current (or close to this).
noelex 77 is online now   Reply With Quote
Old 23-08-2023, 08:37   #250
Senior Cruiser
 
newhaul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,741
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by noelex 77 View Post
The charge limit of 50A or 100A (for emergency situations) applies to each Battleborn 100Ahr battery.

If the battery bank has more than one battery in parallel, the total charge current will be additive (or close to additive). So, for example, a 400Ahr bank would accept 200A (or 400A in an emergency) of charge current (or close to this).
That would make sense however according to their literature it isn't cumulative.
__________________
Non illigitamus carborundum
newhaul is online now   Reply With Quote
Old 23-08-2023, 08:50   #251
Registered User

Join Date: May 2016
Location: Denmark
Boat: Nordship 808
Posts: 324
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by newhaul View Post
That would make sense however according to their literature it isn't cumulative.
From their manual:

"Multiple BB10012|BB10012H batteries may be connected in parallel to increase the capacity and current of the
system. When batteries are connected in parallel, the voltage of the system does not change, but the capacity and
current limits are additive. "
SaylorMade is offline   Reply With Quote
Old 23-08-2023, 09:02   #252
Senior Cruiser
 
newhaul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,741
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by SaylorMade View Post
From their manual:

"Multiple BB10012|BB10012H batteries may be connected in parallel to increase the capacity and current of the
system. When batteries are connected in parallel, the voltage of the system does not change, but the capacity and
current limits are additive. "
Confusion wrt the numbers and specific language so sent email to them for clarification.
__________________
Non illigitamus carborundum
newhaul is online now   Reply With Quote
Old 23-08-2023, 10:28   #253
Registered User

Join Date: May 2006
Posts: 1,353
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by newhaul View Post
Iirc fuss is running Battleborn batteries. Their bms is specificly only allowing for 100amps charging . So a 150 amp alternator is only running at 60% approx of its potential output.
This would easily explain his numbers .
Unlike tho see of us running banks we built ourselves. My little 250ah would likelybcook his alternator as it will accept up to 300 amps charging. ( bms controlled) .
I’m running Eve LF280K, 560ah 24v, I wouldn’t run battleborn as I have restricted space and Eve lf280k fits to within the mm.
The BMV712 says 150ah…often for an extended period, like 5 hours on occasion but generally over an hour.
150ah is 150ah unless the 712 lies…130-140 degrees is the temp that the alternator runs at after it stabilises …but measured from one of the bolts on the outside then probably 110 degrees C.
Fuss is offline   Reply With Quote
Old 23-08-2023, 12:24   #254
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 9,758
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by Fuss View Post
I’m running Eve LF280K, 560ah 24v, I wouldn’t run battleborn as I have restricted space and Eve lf280k fits to within the mm.
The BMV712 says 150ah…often for an extended period, like 5 hours on occasion but generally over an hour.
150ah is 150ah unless the 712 lies…130-140 degrees is the temp that the alternator runs at after it stabilises …but measured from one of the bolts on the outside then probably 110 degrees C.

Might you still be confusing amps and amp hours?
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Mill Bay, BC, SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 23-08-2023, 13:26   #255
Registered User

Join Date: May 2006
Posts: 1,353
Re: DC to DC charger - not needed for boats with proper alternators.

Quote:
Originally Posted by Stu Jackson View Post
Might you still be confusing amps and amp hours?
Yes, probably, what does the BMV 712 measure STU when it says AH?
Fuss is offline   Reply With Quote
Reply

Tags
alternator, boat, charger, rope

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Not sure if my boat has the proper windless Drjonfra Anchoring & Mooring 13 03-06-2022 18:32
GoT sailboats not displaying proper day shapes (cone pointed down) autumnbreeze27 General Sailing Forum 1 14-07-2016 12:26
Proper practices for Flooded Deep Cycle Automatic Inverter/Charger msh_sailers Monohull Sailboats 1 08-10-2015 11:35
Exciter Wire needed on Diesel Alternators? rudolphs Electrical: Batteries, Generators & Solar 3 17-03-2015 14:32
Two Alternators and One Battery Charger lamlie Electrical: Batteries, Generators & Solar 8 06-07-2010 20:05

Advertise Here


All times are GMT -7. The time now is 09:12.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.