Reply
 
Thread Tools Search this Thread
 
Old 26 July 2010, 06:49   #1
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,539
Why two batteries are a good idea

Returned from a week in Devon last weekend so decided to take my rib out for a spin on Sunday as I had been having withdrawal symptons. All was going well until shortly after going through Poole Harbour Entrance the electronics started playing up, VHF buzzed loudly and died, then the GPS went down, then the sterio system started sounding strange, then the engine started misbehaving, noticed the battery indicated was showing around 12.2V when usually it shows 13.8V. Shut everything off once out of traffic and switched to my second battery and everything came back fine. So I strongly expect my first battery which is old (had second fitted with a switch last year when I bought the RIB) needs retiring.

I am so very glad I had the second battery fitted.
__________________

__________________
boristhebold is offline   Reply With Quote
Old 26 July 2010, 06:55   #2
Member
 
Country: UK - England
Town: Poole
Length: no boat
Join Date: Jul 2001
Posts: 673
Have suffered that myself a couple of times over the years and it's always nice when the backup plan works!
__________________

__________________
MarkWildey is offline   Reply With Quote
Old 26 July 2010, 07:12   #3
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,238
glad it worked. though curious as to why you only use one when out and about.

We have two, but run on both when out and about, then switch to one when we leave the boat. Then both get fully charged when out and about and when we leave it, if the bilge sticks for example and flattens the battery, we have the other to start up the engine and charge them both again.

Just a thought. Though there are many ways to skin a cat.
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 26 July 2010, 07:23   #4
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by boristhebold View Post
Returned from a week in Devon last weekend so decided to take my rib out for a spin on Sunday as I had been having withdrawal symptons. All was going well until shortly after going through Poole Harbour Entrance the electronics started playing up, VHF buzzed loudly and died, then the GPS went down, then the sterio system started sounding strange, then the engine started misbehaving, noticed the battery indicated was showing around 12.2V when usually it shows 13.8V. Shut everything off once out of traffic and switched to my second battery and everything came back fine. So I strongly expect my first battery which is old (had second fitted with a switch last year when I bought the RIB) needs retiring.

I am so very glad I had the second battery fitted.
I would check the wiring, especially the earth and have the battery checked at a garage or similar before spending any money - you never know!
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 26 July 2010, 08:54   #5
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,539
Quote:
Originally Posted by HUMBER P4VWL View Post
glad it worked. though curious as to why you only use one when out and about.

We have two, but run on both when out and about, then switch to one when we leave the boat. Then both get fully charged when out and about and when we leave it, if the bilge sticks for example and flattens the battery, we have the other to start up the engine and charge them both again.

Just a thought. Though there are many ways to skin a cat.
Mark - I use battery 1 on one weekend and battery 2 on the next weekend, dont ask me why, I think I do it so I could tell if one battery went bad and obvisouly every other weekend one gets charged off the engine. Im sure there is some logic in that but cant pinpoint it. laughing out loud. Hey it worked, if both had been used I may not have spotted the bad one until too late as they are not connected to any seperate battey monitors.
__________________
boristhebold is offline   Reply With Quote
Old 26 July 2010, 09:32   #6
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 13,772
RIBase
Cookee is right - test your battery and cables first. I'd physically swap the batteries over and see if the problem moves, a handy, free test.

A thorough wiring check is essential in these situations.
__________________
willk is offline   Reply With Quote
Old 26 July 2010, 09:49   #7
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by HUMBER P4VWL View Post
glad it worked. though curious as to why you only use one when out and about.

Just a thought. Though there are many ways to skin a cat.
There are indeed.

Personally, I usually try to run on one battery on the way out, and the other on the return. The only time I have the switch set to BOTH is when one battery has trouble cranking the motor (the batteries are slightly undersized per Yammie's specs.)

I usually pop them on a 6 amp charger for an hour or two prior to leaving home.

Works for me.

jky
__________________
jyasaki is offline   Reply With Quote
Old 26 July 2010, 10:04   #8
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,869
Maybe a Devon Pikey nicked the elecerric.

Bedajim had a about 5mm of wear material nicked off of his clutch plate whilst down there this weekend.
__________________
Mollers is offline   Reply With Quote
Old 26 July 2010, 10:09   #9
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,238
All make sense. Beauty of the forum, you learn what different people do and why, then apply the best logic to your own circumstances/needs.

Happy boating!!
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 26 July 2010, 10:45   #10
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
I have two batteries operating via a VSR so no switching and batteries are always both fully charged and drain protected.
Worked fine for over two years now and never had a problems with batteries.
__________________
BruceB is offline   Reply With Quote
Old 26 July 2010, 14:35   #11
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I run both my batteries together (as one large battery). During pre flight checks I check the voltages seperatly just to compare the condition of each of them. Then if anchored up and using depth gauge, radio, GPS etc I then switch back to one battery, keeping the other as an emergancy starter one if needed.

I like to keep things really simple, so don't have any VSR.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 26 July 2010, 16:04   #12
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,944
RIBase
Quote:
Originally Posted by BruceB View Post
I have two batteries operating via a VSR so no switching and batteries are always both fully charged and drain protected.
Worked fine for over two years now and never had a problems with batteries.
Me too.
__________________
Searider is offline   Reply With Quote
Old 26 July 2010, 16:59   #13
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
Quote:
Originally Posted by Hightower View Post
I run both my batteries together (as one large battery). During pre flight checks I check the voltages seperatly just to compare the condition of each of them. Then if anchored up and using depth gauge, radio, GPS etc I then switch back to one battery, keeping the other as an emergancy starter one if needed
I like to keep things really simple, so don't have any VSR.
I switch on and leave on all day, the VSR does all the above for me. I personally decided a slight increase in equipment complexity was worth simpler operation and one in which it is not possible to leave switched to "both" by mistake!
Horses for courses as usual..........
__________________
BruceB is offline   Reply With Quote
Old 26 July 2010, 18:24   #14
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,238
Bruceb. VSR? excuse my ignorance. Guessing, variable something resistor

Don't get too techie but what is it and what's it do?
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 26 July 2010, 18:54   #15
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Quote:
Originally Posted by BruceB View Post
I switch on and leave on all day, the VSR does all the above for me. I personally decided a slight increase in equipment complexity was worth simpler operation and one in which it is not possible to leave switched to "both" by mistake!
Horses for courses as usual..........
That's fair comment. When I was building my RIB years ago I remember taking some advice from someone that operates Canal narrow boats. He suggested that these pieces of tech were more trouble than they're worth, so I decided to take his advice.

I understand that there are a few people on here that use "Voltage Sensitive Relays". Perhaps they would like to comment if they've had any problems with theirs?
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 26 July 2010, 18:59   #16
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Quote:
Originally Posted by HUMBER P4VWL View Post
Bruceb. VSR? excuse my ignorance. Guessing, variable something resistor

Don't get too techie but what is it and what's it do?
Volage sensitive relay. Basicly charges whichever battery is in the poorest condition. Kind of like a modern "split charge system" but has built in overcharging protection etc.

See here: http://www.power-store.com/?id=197
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 26 July 2010, 20:17   #17
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,367
Bloodyell. I could buy two batteries for the price of one of them! I think ma diode cost about 20p.
__________________
JW.
jwalker is offline   Reply With Quote
Old 27 July 2010, 03:47   #18
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by Hightower View Post
Volage sensitive relay. Basicly charges whichever battery is in the poorest condition. Kind of like a modern "split charge system" but has built in overcharging protection etc.

See here: http://www.power-store.com/?id=197
Actually it doesn't!

It will charge the main (starter) battery first, and when it has reached a pre-set voltage signifying it's full, the relay will trip and charge the second (house) battery - they usually come in a cluster of four with switches for both batteries and an emergency switch to link the two together.

As far as I know there is no overcharging protection either but I've been wrong before!

We have fitted them to several boats and they work very well.
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 27 July 2010, 03:54   #19
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,944
RIBase
Quote:
Originally Posted by Hightower View Post
That's fair comment. When I was building my RIB years ago I remember taking some advice from someone that operates Canal narrow boats. He suggested that these pieces of tech were more trouble than they're worth, so I decided to take his advice.

I understand that there are a few people on here that use "Voltage Sensitive Relays". Perhaps they would like to comment if they've had any problems with theirs?
Had mine fitted for 5 years with no problems.

Cookees right on how they operate.
__________________
Searider is offline   Reply With Quote
Old 27 July 2010, 06:49   #20
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
Quote:
Originally Posted by HUMBER P4VWL View Post
Just a thought. Though there are many ways to skin a cat.
Indeed, and here is another:

One battery, and a bit of suitable length rope with a knot one end & a toggle the other.

Electronics wise there's a handheld VHF under the seat, which gets discharged & recharged the nights before I go out, and a Garmin 12 full of a heap of "tactical" waypoints which sits on the console being powered off the boat battery (gives a "get you home" trail), but has a heap of AAs inside which will give it a further 12 hrs should the boat battery die. Nav. lighs taken care of in the instance of the main engine failing (no charge) by switching from ">7knts" to "<7 knots" mode, i.e one 10W lamp, which at some point I plan to replace with an LED bulb. What's left of the main batt should keep that alive long enough to get to a place of safety. If not, I have a battery ARW that can be gaffa'ed to the frame.

Or, in summary, anything vital hanging off the boat battery has a low power, aux or fully manual backup.

And I have had to use the manaul start option when my main batt switch decided not to play after a particularly bad soaking.......
__________________

__________________
9D280 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:42.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×