UK Motorhome Information, Motorhome facts, American RV, Forums, Reviews, Sales, Campsites


 

Go Back   MotorhomeFun > NUTS & BOLTS & RECOURCES > TECH/MECH GENERAL
Register Forums Blogs FAQ Calendar Mark Forums Read

TECH/MECH GENERAL Discuss anything technical or mechanical that doesnt easily fit into the other sections.

batteries double charging

Reply
 
LinkBack Thread Tools Display Modes
Old 05-02-2013, 21:28   #1 (permalink)
Funster
 
lou020's Avatar
 
Funster No : 13984
Join Date: Oct 2010
Location: huddersfield
About Me: haulage company
Interests: F1.MOTO GP etc.
MH Type: c class
MH Model: compass drifter 460 (peugeot boxer)
Years Motorhoming: since sept 2010
Posts: 193
Thanks: 211
Thanked 44 Times in 30 Posts
Default batteries double charging

another battery question,

i leave the mh on hook up at home all the time which is charging the leisure battery

i also have the engine battery coupled to a ctek battery maintainer/charger which is on all the time on hook up.
i have noticed in the past the in line 25amp fuse from the engine battery to the on board fuse panel,(i presume) has melted the plastic surround of the fuse,it has never blown the fuse
i have changed this fuse 3 times in the last 2 years.

i was wondering if it was possible for the leisure battery to be getting 2 lots of charge,1 from the ctek + 1 from hook up, and overheating the fuse.
there is 2 wires coming from engine battery, i presume 1 is for fridge and the other is the charge to the leisure battery, both are fused with 25 amp fuses, and it only melts the one.

the fuses are the cheapo type, hard clear plastic.

cheers Lou
lou020 is online now   Reply With Quote
Sponsored Links
Old 05-02-2013, 22:13   #2 (permalink)
Funster
 
FULL TIMER's Avatar
 
Funster No : 21259
Join Date: May 2012
Location: NORWICH
About Me: me and the wife have been fulltimers since November 2006,
Interests: shooting, metal detecting
MH Type: SELF BUILT IVECO 75E17
MH Model: self built on Iveco Eurocargo, ex prison transport
Years Motorhoming: BEEN BUILDING THEM FOR 32 years
Posts: 652
Thanks: 0
Thanked 174 Times in 140 Posts
Default

it is possible that the voltage going into your engine battery could be high enough to trigger the split charge relay therefore linking the two batteries, I had this happen with a durite self sensing split charger when I connected a sterling battery charger (capable of charging 3 separate battery banks independently) to my vehicle battery and the leisure batteries. might be worth taking the fuses out if you want to have both batteries on charge at the same time with two separate chargers, or maybe temporarily run a couple of wires from you leisure battery to the engine battery pos - pos , neg - neg and just have the habitation charger on.
FULL TIMER is offline   Reply With Quote
The Following User Says Thank You to FULL TIMER For This Useful Post:
lou020 (06-02-2013)
Old 06-02-2013, 06:50   #3 (permalink)
Funster
 
lou020's Avatar
 
Funster No : 13984
Join Date: Oct 2010
Location: huddersfield
About Me: haulage company
Interests: F1.MOTO GP etc.
MH Type: c class
MH Model: compass drifter 460 (peugeot boxer)
Years Motorhoming: since sept 2010
Posts: 193
Thanks: 211
Thanked 44 Times in 30 Posts
Default

Chere's fulltimer, l was thinking of taking the fuse out whilst on hook up.
lou020 is online now   Reply With Quote
Old 06-02-2013, 08:18   #4 (permalink)
Trader - Funster
 
eddievanbitz's Avatar
 
Funster No : 540
Join Date: Oct 2007
Location: Taunton Somerset
About Me: Married to Lynda, the love of my life. Four kids and 2 dogs
Interests: Wine, Beer, food, boating, & rugby!
MH Type: RV
MH Model: Gulf Stream Sun Voyager
Years Motorhoming: since 1989
Posts: 1,908
Thanks: 441
Thanked 390 Times in 279 Posts
Default

Quote:
Originally Posted by lou020 View Post
Chere's fulltimer, l was thinking of taking the fuse out whilst on hook up.
You dont need to. On your motorhome the split charge relay is not voltage sensing.

When the engine starts, the feed to your alternator warning light (on the dash) is used to energise a relay which puts the batteries in parallel (joins them together)

A simulteaneous charge will not cause that fuse to blow. Not only that the CTek charger is clever enough to sense when there is no need for it to work.

A bit like having the engine running on a sunny day, both the alternator and the solar panel regulator would cause the same problem. In reaity one of them (normally the solar regulator) would shut down as it would know that it is not needed.

The reason that the fuse is blowing is when you go away off hook up and use your leisure battery , when you drive home you have a fully charged engine battery and a flat leisure battery. You start the engine and the batteries are in parallel (joined together) and the batteries try to balance and "pop" goes the fuse.

Very common after a flat engine battery as well the other way around after a jump start.

Removing the fuse when at home will have no effect. The only solution is to either live with it and keep an eye on things or replace the wire with a heavier guage add a 100amp relay and uprate the fuse and fuse holder to say 120amps. Or invest in a Battery to Battery charger that will resolve such issues as this.

Hope that this helps

Eddie
terry and dave newell lvs like this.
__________________
http://www.vanbitz.com/10-motorhome-fun-discounts/

10% discount to MotorhomeFun subscribers on
KVH domes, Oyster satellite, Dometic, Waeco, Sterling, Solar, Strikeback & Growler Security Systems plus much, much,more



eddievanbitz is offline   Reply With Quote
The Following User Says Thank You to eddievanbitz For This Useful Post:
lou020 (06-02-2013)
Old 06-02-2013, 19:51   #5 (permalink)
Funster
 
FULL TIMER's Avatar
 
Funster No : 21259
Join Date: May 2012
Location: NORWICH
About Me: me and the wife have been fulltimers since November 2006,
Interests: shooting, metal detecting
MH Type: SELF BUILT IVECO 75E17
MH Model: self built on Iveco Eurocargo, ex prison transport
Years Motorhoming: BEEN BUILDING THEM FOR 32 years
Posts: 652
Thanks: 0
Thanked 174 Times in 140 Posts
Default

bearing in mind that it would seem that your vehicle doesn't have a self sensing relay I agree with everything Eddie has said,
eddievanbitz and lou020 like this.
FULL TIMER is offline   Reply With Quote
The Following User Says Thank You to FULL TIMER For This Useful Post:
lou020 (07-02-2013)
Old 06-02-2013, 20:11   #6 (permalink)
Funster
 
pappajohn's Avatar
 
Funster No : 172
Join Date: Aug 2007
Location: scarborough, nth yorks
About Me: Waiting for Tommorrow
Interests: beer,tv and motorhoming
MH Type: A class
MH Model: Rexhall Rexair 6.8ltr V10 ford triton
Years Motorhoming: 8 years
Posts: 22,854
Thanks: 1,330
Thanked 4,910 Times in 4,158 Posts
Default

also, dump the cheap fuses....nothing but trouble.

i used to use the ones from shops....50 or 100 assorted fuses for a quid...constantly either melting or 'invisible' blowing. (blowing right at the end where you cant see the break)

cant see how they can source materials for that sort of money each, never mind manufacturing and packaging costs on top...quality has to suffer.
lou020 likes this.
__________________
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
I'm trying to see it from your point of view
but i cant get my head that far up my ass
_-_-_-_-_-_-_-_-_-_-_-_

pappajohn is online now   Reply With Quote
The Following User Says Thank You to pappajohn For This Useful Post:
lou020 (07-02-2013)
Old 07-02-2013, 21:21   #7 (permalink)
Funster
 
lou020's Avatar
 
Funster No : 13984
Join Date: Oct 2010
Location: huddersfield
About Me: haulage company
Interests: F1.MOTO GP etc.
MH Type: c class
MH Model: compass drifter 460 (peugeot boxer)
Years Motorhoming: since sept 2010
Posts: 193
Thanks: 211
Thanked 44 Times in 30 Posts
Smile

Thanks for the replys, I think i will try a better quality fuse.

It has never blown the fuse it just try's to melt the casing, the 25amp fuse is clear (ish) but it turns the plastic milky and expands,
the cable is about 6mm and i wonder if the fuse holder is not capable of carrying the current.
the fuse holder is the type with ordinary spade ends and the fuse slots in the top.

i fitted a new fuse(cheapo) tuesday and i will monitor it whilst the mh is parked up.

I will invest in quality fuses also. soon
Lou
lou020 is online now   Reply With Quote
Old 07-02-2013, 21:25   #8 (permalink)
Trader - Funster
 
eddievanbitz's Avatar
 
Funster No : 540
Join Date: Oct 2007
Location: Taunton Somerset
About Me: Married to Lynda, the love of my life. Four kids and 2 dogs
Interests: Wine, Beer, food, boating, & rugby!
MH Type: RV
MH Model: Gulf Stream Sun Voyager
Years Motorhoming: since 1989
Posts: 1,908
Thanks: 441
Thanked 390 Times in 279 Posts
Default

Quote:
Originally Posted by lou020 View Post
Thanks for the replys, I think i will try a better quality fuse.

It has never blown the fuse it just try's to melt the casing, the 25amp fuse is clear (ish) but it turns the plastic milky and expands,
the cable is about 6mm and i wonder if the fuse holder is not capable of carrying the current.
the fuse holder is the type with ordinary spade ends and the fuse slots in the top.

i fitted a new fuse(cheapo) tuesday and i will monitor it whilst the mh is parked up.

I will invest in quality fuses also. soon
Lou
The fact that the fuse isn't blowing means it is nothing to do with the quality of the fuse.

It is melting as your transferring too much current creating heat.

Eddie
__________________
http://www.vanbitz.com/10-motorhome-fun-discounts/

10% discount to MotorhomeFun subscribers on
KVH domes, Oyster satellite, Dometic, Waeco, Sterling, Solar, Strikeback & Growler Security Systems plus much, much,more



eddievanbitz is offline   Reply With Quote
Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are Off



Design by vBSkinworks
 
 
MotorhomeFun Shop
Autogas2000 -Refillable LPG solutions for the Motorhome
Get a free giffgaff Sim
Friendly professional service from qualified technicians
Pure Water From Your Tank
Free Fun Stickers
Don't buy a Motorhome before you read this guide
Johns Cross Motorcaravans
Garage run by Geo