B To B charger

Sep 7, 2016
391
336
Ayr
Funster No
45,007
MH
Adria Matrix M670SL
Exp
2006
Hi guys has anyone fitted a B to B battery charger to their Adria motorhome " if so where did you mount the charger as I have heard they heat up a bit , not much room where the leisure batteries are under the seat at the door , so just looking for some guidance if anyone has fitted one of these, I'm looking at the Vitron isolated charger, thank in advance .
 
May 23, 2012
354
304
Anglesey
Funster No
21,173
MH
Adria Matrix 670
Exp
2012
I have a 2020 Matrix and was going to fit B2B charger but when my hab battery was down a bit I started the engine and was getting 50amps from the alternator which recharged it quickly. So do I still need a B2B any advice would be most welcome.
 

Jim

Ringleader
Jul 19, 2007
31,696
87,036
Sutton on Sea
Funster No
1
MH
C Class Diesel RV
Exp
Since 1988
I have a 2020 Matrix and was going to fit B2B charger but when my hab battery was down a bit I started the engine and was getting 50amps from the alternator which recharged it quickly. So do I still need a B2B any advice would be most welcome.

Throwing amps in is good, but only so far. The multi stage charging B2B will caress your battery, as well as charge it about 5 x faster than your split charge relay.

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Sep 29, 2019
985
2,625
Funster No
64,846
MH
Hymer Exsis
Exp
20 years
Hi guys has anyone fitted a B to B battery charger to their Adria motorhome " if so where did you mount the charger as I have heard they heat up a bit , not much room where the leisure batteries are under the seat at the door , so just looking for some guidance if anyone has fitted one of these, I'm looking at the Vitron isolated charger, thank in advance .

I put mine under the seat, itā€™s in the thread bookmarked on my signature.

I have a 2020 Matrix and was going to fit B2B charger but when my hab battery was down a bit I started the engine and was getting 50amps from the alternator which recharged it quickly. So do I still need a B2B any advice would be most welcome.
You already have one if you are getting 50amps out.

You should be able to trace the cables and find it to confirm.
 
Jan 19, 2014
4,437
13,508
south shields
Funster No
29,767
MH
Chausson 620 welcoome
Exp
since 1990
You already have one if you are getting 50amps out.
I dont agree with that statement..
If your split charge system wiring is substantial enough..and the alternator is capable enough there is no reason why you couldn't get high current flow through a split charge system..
In fact one of the reasons for fitting a battery to battery could well be to limit current flow and protect the alternator especially at low revs when the cooling may not be sufficient..
All this made more critical by installing lithium which will take a very high current for a more prolonged period than a lead acid bank.
Andy
 
Sep 29, 2019
985
2,625
Funster No
64,846
MH
Hymer Exsis
Exp
20 years
I dont agree with that statement..
If your split charge system wiring is substantial enough..and the alternator is capable enough there is no reason why you couldn't get high current flow through a split charge system..
In fact one of the reasons for fitting a battery to battery could well be to limit current flow and protect the alternator especially at low revs when the cooling may not be sufficient..
All this made more critical by installing lithium which will take a very high current for a more prolonged period than a lead acid bank.
Andy

I agree that you could disagree. :)

Hymer generally do thick cable and good split charging systems. Never seen more than about 25amps out of mine hence why I think there will be a B2B on the system.

I could be wrong, only way is to find the B2B or lack of.

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Tombola

LIFE MEMBER
Nov 21, 2020
404
1,469
Funster No
78,053
MH
Autotrail Imala 734
Exp
12 years
I have a 2020 Matrix and was going to fit B2B charger but when my hab battery was down a bit I started the engine and was getting 50amps from the alternator which recharged it quickly. So do I still need a B2B any advice would be most welcome.
thats a good amount direct via your split charger.
 
Jan 19, 2014
4,437
13,508
south shields
Funster No
29,767
MH
Chausson 620 welcoome
Exp
since 1990
I agree that you could disagree. :)

Hymer generally do thick cable and good split charging systems. Never seen more than about 25amps out of mine hence why I think there will be a B2B on the system.

I could be wrong, only way is to find the B2B or lack of.
Sorry.. re reading my post its a bit blunt..I'm afraid I have little tact..and indeed you could be right and there may well be a battery to battery charger already installed.. (y)
It's just your statement stood out when I read it..
I had a battery to battery installed and I had the split charge disabling relay wired so that I could activate it or disable it..
I wasn't doing this at high current loads but I played around with it for long enough to see that where the alternator voltage exceeded the output voltage of the battery to battery charger the split charge wiring did in fact provide a higher current to the leisure batteries than the battery to battery charger was doing when the split charge system was disabled.. if you follow that:unsure::rolleyes:
Andy.

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May 23, 2012
354
304
Anglesey
Funster No
21,173
MH
Adria Matrix 670
Exp
2012
Throwing amps in is good, but only so far. The multi stage charging B2B will caress your battery, as well as charge it about 5 x faster than your split charge relay.
How will it charge my battery 5 times faster when my alternator is putting 50 amps in
 
OP
Trout bum
Sep 7, 2016
391
336
Ayr
Funster No
45,007
MH
Adria Matrix M670SL
Exp
2006
Bit confusing now šŸ™‚Most folks fulltiming seem to have fitted a BtB unit as most are wild camping and want batteries kept charged while driving, I take it vans have a split charger unit fitted as standard ? So I'm guessing when so many folk are installing a BtB it's a much better unit, it's just finding space to install it I can't put it under drivers seat I have the compressor for rear air bags there, also I'm thinking of fitting an inverter as well for off grid camping , to be honest I think it's going to be difficult to get booked on a site this year as there are more Motothomes and caravans than there has ever been due to staycation and folks not wanting to fly .
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
27,726
46,805
On the coast in West Sussex
Funster No
658
MH
Hymer B678 Dynamic Line
Exp
Since 2008 & many years tugging
I agree that you could disagree. :)

Hymer generally do thick cable and good split charging systems. Never seen more than about 25amps out of mine hence why I think there will be a B2B on the system.

I could be wrong, only way is to find the B2B or lack of.
I see 44 amps on one of my Hymers when the Gel batteries were very low.

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Feb 19, 2020
179
182
North Ayrshire
Funster No
68,864
MH
Adria Matrix 670SC
Exp
Newbie
Hi guys has anyone fitted a B to B battery charger to their Adria motorhome " if so where did you mount the charger as I have heard they heat up a bit , not much room where the leisure batteries are under the seat at the door , so just looking for some guidance if anyone has fitted one of these, I'm looking at the Vitron isolated charger, thank in advance .
What is it you want the B2B charger to do? As it is just now On hook up or with engine running both batteries will be charging. Do you want to charge the cab battery from the hab assuming you have solar which only charges the hab battery? Battery Master would do the job in that case.
 
OP
Trout bum
Sep 7, 2016
391
336
Ayr
Funster No
45,007
MH
Adria Matrix M670SL
Exp
2006
Due to a lot more motorhome and vans being on the road campsite are going to be difficult to get booked into, so I intend to do a lot more wild camping, so want leisure batterirs well topped up when I am travelling, with a BtB charger and an inverter will have all the power I need hopefully .

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Feb 19, 2020
179
182
North Ayrshire
Funster No
68,864
MH
Adria Matrix 670SC
Exp
Newbie
I don't understand what you're want the B2B to do. Your alternator will already charge your leisure battery when travelling. Am I missing something?
 

Tombola

LIFE MEMBER
Nov 21, 2020
404
1,469
Funster No
78,053
MH
Autotrail Imala 734
Exp
12 years
I don't understand what you're want the B2B to do. Your alternator will already charge your leisure battery when travelling. Am I missing something?
Hes looking for more ooomph,
for instance my alternator only charges mine at around 7 amps, adding the b2b gets me 37
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
27,726
46,805
On the coast in West Sussex
Funster No
658
MH
Hymer B678 Dynamic Line
Exp
Since 2008 & many years tugging
I don't understand what you're want the B2B to do. Your alternator will already charge your leisure battery when travelling. Am I missing something?
Normal charging via a split charge relay is only 15 to 25 amps with a B2B you can get 50 amps plus.

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OP
Trout bum
Sep 7, 2016
391
336
Ayr
Funster No
45,007
MH
Adria Matrix M670SL
Exp
2006
I don't understand what you're want the B2B to do. Your alternator will already charge your leisure battery when travelling. Am I missing something
I don't understand what you're want the B2B to do. Your alternator will already charge your leisure battery when travelling. Am I missing something?
at present leisure batteries only get a small charge with a B tB they get a lot more hence better for wild camping

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