Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-08-2016, 04:53   #1
Registered User

Join Date: Mar 2012
Location: Boston, Massachusetts
Boat: BENETEAU Oceanis 48
Posts: 21
Bow thruster batteries on Beneteau oceanis

We have owned our Beneteau Oceanis for three years. For all that time, after modest use of the bow thruster, we get a battery alarm. This occurred at new boat hand over, and they said "don't worry about that, it's nothing". We worry about it.

Has anyone else seen this problem, and what did you do to fix it?

Thanks,
__________________

__________________
LJScott is offline   Reply With Quote
Old 11-08-2016, 05:24   #2
Registered User

Join Date: Sep 2013
Posts: 32
Re: Bow thruster batteries on Beneteau oceanis

I have a 2yr old Oceanis . This may not be the same situation but worth a look......the only time I had a battery alarm go off.....the dealer had set the engine idle rpm to low and engaging thr thrusters draws a ton of juice and the low rpm drops the charge rate to low the alarm goes off ........800 rpm is the number......
__________________

__________________
blue otter is offline   Reply With Quote
Old 11-08-2016, 06:16   #3
Registered User

Join Date: Mar 2011
Location: Caribbean/UK
Boat: Oyster 66
Posts: 914
Re: Bow thruster batteries on Beneteau oceanis

I don't understand why boat builders feed bow thrusters with their own battery. Given the massive current draw in relation to their capacity, the peukert number will result in them not being much use. Especially so if the battery isn't in perfect shape and charge and is a flooded type. The house battery on the other hand will be much less effected by the large draw. It also is weight where you don't want it.

Maybe your issue in in the battery state, could also be an incorrectly set alarm. The bow thruster will drop voltage to low levels temporarily even in good batteries.
__________________
poiu is offline   Reply With Quote
Old 11-08-2016, 07:02   #4
Registered User

Join Date: Apr 2014
Boat: Beneteau Oceanis 45
Posts: 172
Re: Bow thruster batteries on Beneteau oceanis

On my 2016 Oceanis 45 I have two batteries mounted next to the thruster. I use it every time I leave from the slip or return because I have to rotate the boat 90 (it's a tight spot). I have never gotten a battery alarm.

I think you should use a multimeter to watch the battery voltage before, during, and after using the thruster. Do the same at the thruster motor to see if you have excessive voltage drop through the cables. This should help determine if you have a charging problem, wiring problem, or just need more battery capacity.
__________________
SteveInMD is offline   Reply With Quote
Old 11-08-2016, 07:54   #5
Registered User

Join Date: Mar 2012
Location: Boston, Massachusetts
Boat: BENETEAU Oceanis 48
Posts: 21
Re: Bow thruster batteries on Beneteau oceanis

Technicians just left. Their view is that all batteries are fine, but that temporarily, the bow thruster pulls more power than the alternator can supply, and we get a temporary alarm. This goes away once the alternator has caught up. Based on what we experience, this explanation sends reasonable.

We appreciate your insights.
__________________
LJScott is offline   Reply With Quote
Old 11-08-2016, 08:12   #6
Moderator
 
nigel1's Avatar

Cruisers Forum Supporter

Join Date: Oct 2009
Location: Manchester, UK
Boat: Beneteau 473
Posts: 4,930
Re: Bow thruster batteries on Beneteau oceanis

Might want to look at increasing the size of the charging wires. Beneteau would have used the minimum they could get away with.
__________________
Nigel
Beneteau 473
Manchester, UK
nigel1 is offline   Reply With Quote
Old 11-08-2016, 08:16   #7
Registered User

Join Date: Sep 2015
Location: Hailey, ID
Boat: Gulf 32 & Nimble 20
Posts: 305
Re: Bow thruster batteries on Beneteau oceanis

Quote:
Originally Posted by poiu View Post
I don't understand why boat builders feed bow thrusters with their own battery. Given the massive current draw in relation to their capacity, the peukert number will result in them not being much use. Especially so if the battery isn't in perfect shape and charge and is a flooded type. The house battery on the other hand will be much less effected by the large draw. It also is weight where you don't want it.
Agree totally!

Quote:
Originally Posted by poiu View Post
The bow thruster will drop voltage to low levels temporarily even in good batteries.
My guess is it's this... in the Beneateaus we've chartered, regardless of battery charge level / capacity, when the windlass is going the voltage available to your alarm is going to be much lower (because of the temporary draw of the windlass) so it will alarm, when the windlass is shut off the voltage comes back up. But of course then you have to reset the battery alarm
__________________
Hailey, Idaho & Bellingham, WA
Sailing blog: http://Sailing.PictureOfNectar.com
basssears is offline   Reply With Quote
Old 11-08-2016, 08:28   #8
Sponsoring Vendor
 
YachtBroker's Avatar

Community Sponsor

Join Date: May 2015
Location: Kemah, Texas
Boat: 2006 Catalina 350
Posts: 140
Send a message via Skype™ to YachtBroker
Re: Bow thruster batteries on Beneteau oceanis

I was a Beneteau dealer for 19 years and this was a common problem. It is exactly what the technicians said, the draw is too great that it's dropping the amperage below the min set amount and the alarm goes off. Same reason why on most Ben's you can't run the windlass without the engine running.
__________________
Kent Little, CPYB
Kent@LittleYachtSales.com
1983-2016 Celebrating Over 33 Years of Professional Yacht Sales
Direct line-713-817-7216
Waterford Harbor, 800 Mariners Drive Pier 6/7, Kemah, TX 77565
YachtBroker is offline   Reply With Quote
Old 11-08-2016, 08:32   #9
Registered User

Join Date: Jul 2008
Location: Annapolis, MD
Boat: Oceanis 45
Posts: 45
Re: Bow thruster batteries on Beneteau oceanis

I have a 2014 Oceanis 45 with the same issue. When I go to reset the alarm it shows I'm still at 12.7v. The beeping is quite annoying.
__________________
Myknjul is offline   Reply With Quote
Old 11-08-2016, 08:36   #10
Registered User

Join Date: Apr 2014
Boat: Beneteau Oceanis 45
Posts: 172
Re: Bow thruster batteries on Beneteau oceanis

Quote:
Originally Posted by LJScott View Post
Technicians just left. Their view is that all batteries are fine, but that temporarily, the bow thruster pulls more power than the alternator can supply, and we get a temporary alarm. This goes away once the alternator has caught up. Based on what we experience, this explanation sends reasonable.

We appreciate your insights.
But the purpose of the batteries located at the thruster is to allow for the short term massive current draw. Then the recharge can happen slowly over time. If you get an alarm I would think you need to increase the size of the bank at the thruster. Otherwise you are being hard on both the thruster and thruster batteries by running both at a lower voltage than intended. It seems to work correctly in the 2016 boats.
__________________
SteveInMD is offline   Reply With Quote
Old 11-08-2016, 08:47   #11
Registered User

Join Date: Apr 2014
Boat: Beneteau Oceanis 45
Posts: 172
Re: Bow thruster batteries on Beneteau oceanis

Adding a battery is probably less expensive than the massive cables that would be needed to pull power from the house bank since it is far away.
__________________
SteveInMD is offline   Reply With Quote
Old 11-08-2016, 09:24   #12
Registered User

Join Date: Jul 2012
Posts: 61
Re: Bow thruster batteries on Beneteau oceanis

I have an engine battery bank and a house battery bank. Both have two batteries at a total of 300ah each. The engine batteries are rated to give more amps ooomph to start the engine, run the windlass and operate the bowthruster. The house batteries are more deep-cycle. We have half a ton of copper between the engine batteries and the bowthruster and have only ever had issues when the engine batteries were end-of-life
__________________
Nadezhda is offline   Reply With Quote
Old 11-08-2016, 09:28   #13
Registered User

Join Date: Mar 2012
Location: Boston, Massachusetts
Boat: BENETEAU Oceanis 48
Posts: 21
Re: Bow thruster batteries on Beneteau oceanis

Thanks everyone... You've helped us understand the problem.
__________________
LJScott is offline   Reply With Quote
Old 11-08-2016, 12:09   #14
Marine Service Provider

Join Date: Jun 2016
Posts: 152
Re: Bow thruster batteries on Beneteau oceanis

The thruster battery should be as close as possible to the thruster and dedicated to the thruster and the windlass, each on its fused circuit. Thruster amperage requires very large and expensive power cables, and the longer they are, the more heat and energy loss will be created. I suggest putting a multimeter in voltage setting across the terminals of the thruster battery and then have a crew member operate the thruster. Resting the battery should be at around 13 volts and the voltage should not drop by more than 2 volts when the thruster turns on. If you're much outside of those parameters, the battery is probably shot. The alternator does not put out enough power to have any significant effect on the thruster - all of that short term burst of current must come from the battery bank. This needs checking because low voltage while the thruster is operating will cause premature failure of the solenoids. If everything checks out, then the alarm may be just a quirk of the system, but I wouldn't bank on that.Let me know if you need more information
Good luck
John Mardall
Vetus Maxwell Group
__________________
JOHNMARDALL is offline   Reply With Quote
Old 11-08-2016, 15:57   #15
Registered User

Join Date: Feb 2015
Location: Certosa Marina, Venice
Boat: Jeanneau 43ds
Posts: 158
Send a message via Skype™ to SaltyMetals
Re: Bow thruster batteries on Beneteau oceanis

Interesting. I hv a Jeanneau 43ds which has a bow-thruster with its own batteries alongside the thruster and I suspect is very similar to the Oceanis. What is surprising is that both the 3 X 110 Ah service batteries and the 1 X 110 Ah engine battery were replaced after 8 years but the two smaller bow-thruster batteries are still going strong and are now 12 yr old.
__________________

__________________
SaltyMetals is offline   Reply With Quote
Reply

Tags
beneteau, oceanis

Thread Tools
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
For Sale: Vetus BOW-160 bow thruster motor 157hunt Classifieds Archive 0 28-10-2015 07:19
Oceanis 45 Bow Thruster issues... LordByron Monohull Sailboats 5 27-09-2014 18:42
Beneteau 49/50 Bow Thruster leak paulkenna Monohull Sailboats 3 07-10-2012 02:25
Adding Bow Thruster and Windlass . . . What to Do with Batteries geoffr Electrical: Batteries, Generators & Solar 26 20-09-2010 04:26


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:45.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.