Thread Tools Search this Thread Display Modes
Old 03-04-2021, 08:51 AM   #1
City: Jupiter
Vessel Name: Metta
Vessel Model: Californian 34 LRC
Join Date: Feb 2021
Posts: 11
34 LRC mystery part

Anyone have any idea what this is? Is it possible that itís the original inverter?
Attached Thumbnails
CMantra is offline   Reply With Quote
Old 03-04-2021, 09:24 AM   #2
RT Firefly's Avatar
City: Slicker?
Join Date: Oct 2007
Posts: 14,934
Welcome aboard. No idea but inverter is a good guess...

RT Firefly is offline   Reply With Quote
Old 03-04-2021, 09:31 AM   #3
obthomas's Avatar
City: Seabrook Texas
Vessel Name: TheVenture
Vessel Model: 1985 Bestway Labelle Sundeck 40ft
Join Date: May 2013
Posts: 559
It is a battery combiner.
obthomas is offline   Reply With Quote
Old 03-04-2021, 12:48 PM   #4
TF Site Team
Bacchus's Avatar
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 5,621
Looks like it may be a batty isolator.
If its wired to the alt output and several battys it splits the charge but prevents drawing other banks down under load. I dont think I have seen one with that many terminals? More commen with 2 or 3 batty connections.
If thats what it is there are many other more modern and better techno,ogres available. Diodes will drop V approx a Volt which can be an issue when trying to charge battys.
2008 MS 34 HT Trawler
Bacchus is offline   Reply With Quote
Old 03-04-2021, 02:38 PM   #5
C lectric's Avatar
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 3,624
It is called a Battery Isolator. It uses diodes to separate the alternator output to the battery sets, and prevent/isolate the batteries from discharging into one another.

They do work BUT and in battery charging system this is important that they cause a voltage drop of approx. 0.6V which to our systems is a lot.
THere are lots of work arounds.

But even better are the newer combiners/smart combiners, or ACR.
THese create virtually no Vdrop as they are simply a large relay OR use Mosfets for VERY Low Vdrop to the batteries.

Some electronic controls are used to sense voltage buildup for closing and joining the battery sets
voltage dropping to open thus isolating the battery sets to prevent an unintended discharge.

THis one has two inputs from two alternators and three outputs to three batteries.
C lectric is offline   Reply With Quote
Old 03-04-2021, 05:42 PM   #6
TF Site Team
Comodave's Avatar
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 13,300
And a lot of corrosion going on. Also the connections look suspect.
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 03-05-2021, 10:06 AM   #7
TF Site Team
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 3,203
A battery combiner with 5 small lugs and a variety of wire sizes?? It looks like a simple positive bus bar with a heat sink to dissipate heat. My guess is the main lead comes in from the battery to the bus bar. I'd guesss there is in internal or backplane connector to the switches. You can wire devices to the devices or hard wired DC devices directly into the bus bar (Though I would expect to see inline fuses on the wires from a bus bar.
Shrew is offline   Reply With Quote
Old 03-05-2021, 10:37 AM   #8
High Wire's Avatar
City: Cape May, NJ and Englewood, FL
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,240
As C Lectric says it’s a battery “isolator” which was popular back in the 70’s and 80’s to charge multiple battery installations from a single alternator. This was before “combiners “ and “voltage sensing relays” arrived on the marine market.
Irish Lady
1984 Monk 36 Hull #46
Currently in Englewood, FL
High Wire is offline   Reply With Quote
Old 03-05-2021, 10:24 PM   #9
TF Site Team
FlyWright's Avatar
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,558
C lectric knows his stuff! I'd listen to him...and chuck that into the bilge as ballast when you install an ACR/combiner.
My boat is my ark. It's my mobile treehouse and my floating fishing cabin. It's my retreat and my respite. Everyday I thank God I have a boat! -Al FJB

@DeltaBridges - 25 Delta Bridges in 25 Days
FlyWright is offline   Reply With Quote
Old 03-15-2021, 10:02 AM   #10
City: Jupiter
Vessel Name: Metta
Vessel Model: Californian 34 LRC
Join Date: Feb 2021
Posts: 11
Thanks for the help!

I will definitely have to look into updating it as Iíd planned to add solar at some point anyway. The more I get into the electrical on this boat the more I realize that it needs more work than originally suspected. My surveyor told me up front Iíd need a marine electrician to sort out whatever the previous ownerís dad (a retired marine electrician) did. Iím finding now the more that I trace wires and check panels and continuity that instead of repairing a lot of the electrical that started to get wonky, he just added new stuff and bypassed all the old stuff and left the old stuff there and only if he needed it for fishing (which was his main use for the boat). A lot of the liveaboard amenities werenít part of that list which is frustrating cause Iím living on it. Iím finding lots of disconnected, unterminated wires still throughout the boat.
CMantra is offline   Reply With Quote
Old 03-18-2021, 02:28 PM   #11
City: Jupiter
Vessel Name: Metta
Vessel Model: Californian 34 LRC
Join Date: Feb 2021
Posts: 11
Until I’m able to replace the combiner, would it be an appropriate place to hook a solar trickle charge to so I don’t have to run my engines or generator daily. I really hate burning diesel if I don’t have to, especially since I’m in south Florida and the sun is abundant more often than not. I’m about to kill my power and go clean the terminals on the combiner cause it needs to be done. I’m just trying to think of ways to get by until I can line up the haul out and tackle all this electric with an overhaul
CMantra is offline   Reply With Quote

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

» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program

All times are GMT -5. The time now is 12:51 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012