Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-22-2020, 04:55 PM   #1
PDF
Ensign
 
Join Date: Jun 2020
Posts: 8
Default Batteries / Bow thruster question.

Hi all,

I have a 2600 SE that currently has 2 x 85 AH deep cycle batteries connected to a 1/2/Both switch. They are just over a year old.

I start the engine on 1, switch to 2 on the anchor then 1 to start again at the end of the day. Both charged on shore power when back at the marina.

When using the bow thruster (needed for a difficult home berth) , the voltage drops quite significantly,
even on the both switch and the other day cut out the nav device.

I'm thinking of adding a third battery and this is my plan...... parallel the 2 x 85 AH deep cycle batteries and use as the house bank (Switch position 2), buy and fit a proper starting battery with some serious CCA to use for starting and also to help deliver some decent power to the bow thruster as I don't think the deep cycle batteries can deliver the power in quick short bursts.

I figure this is the easiest and cheapest way to do it, thoughts??


(The current 85 ah batteries have been tested, all good, alternator is delivering decent charge as is the shore power battery charger)

I don't really want to add dedicated batteries up front for the bow thruster due to expense/ complexity and it really is only used for 2 - 3 short bursts.
__________________

PDF is offline   Reply With Quote
Old 09-23-2020, 12:19 AM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 8,224
Default

What is the power draw of the thruster? What size and how long is the wires supplying it.
__________________

__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 09-23-2020, 01:53 PM   #3
Moderator

 
Join Date: Apr 2008
Posts: 4,918
Default

You might need a dedicated battery for the thruster with a DC -> DC charger from the starting battery. If you get a dedicated battery, it should be located close to the thruster.

Otherwise, I'm with Mike

What is the make and model of the thruster?
What is the amp draw of the thruster?
What is the distance from the battery to the thruster?
What size (guage) wires are feeding the thruster?
shrew is offline   Reply With Quote
Old 09-23-2020, 03:46 PM   #4
PDF
Ensign
 
Join Date: Jun 2020
Posts: 8
Default

Cheers for the replies, away from the boat at the moment but will check the wire size and distance (I guess 5 metres or so). It's a vetus bow thruster but again I'll have to check which model so I can get the current draw.

Boat was new to me in June this year and I'm trying to sort out the previous owners bodges. She's a great boat though.
PDF is offline   Reply With Quote
Old 09-24-2020, 02:51 PM   #5
Moderator

 
Join Date: Apr 2008
Posts: 4,918
Default

Also check to see if the thruster is wired to the starting or the house batteries. It should be to the starting battery so that the alternator can push the thruster.
shrew is offline   Reply With Quote
Old 10-06-2020, 08:09 PM   #6
PDF
Ensign
 
Join Date: Jun 2020
Posts: 8
Default

Sorry for the delay in replying, only just been down to the boat.

Bow thruster is a side power se 40/125. The cables connecting it look thick enough, see pictures attached.

I didn't get a chance to check the battery connections. As the thick cables are in place already I think its probably the fact the boat has 2 deep cycle batteries and no decent starting battery, think i'll probably add a starting battery and use for starting and bow thruster (switch position 1) and parallel the two deep cycle batteries for the house bank (switch position 2).
Attached Thumbnails
20201006_140808.jpg   20201006_140815.jpg  
__________________

PDF is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 12:42 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.