Member Since: 21 Oct 2016
Location: kent
Posts: 13612
VSR systems
Hi
Currently have fitted a T max split charge battery system, however I’ve now had to replace 2 x relays which causes the leisure battery to drain , as it’s smaller than the main one
So wish to remove it and thinking of fitting a VSR relay , been looking at the following but can’t see the difference , unless it’s just the amperage rating , do u think the amps are suffice please and do u think it’s a better system to fit or maybe something else
Plus as I currently charge my main battery via my 12s socket is there a way I can wire it in such a way so it will charge my Aux battery as well please
With mine being a 2005 euro 3 I assume it hasn’t got a smart alternator fitted
Many thks
19th Jul 2021 12:44 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
I would think the Victron one is the way to go, it may also work with your 12s charging method
20th Jul 2021 9:45 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13612
Many thks, alas though didn’t realise at first it won’t work with smart alternator so that one is out
So been looking at some of the B2B ones, do like the victron but blimey some are very expensive
Or maybe a solid state relay
20th Jul 2021 11:16 am
Duc750
Member Since: 07 Aug 2017
Location: northampton
Posts: 305
so a VSR is pretty much the same as a split chagre relay wrapped up in a neater box with a fresh TLA
if you have a VSR and the voltage goes above the connect voltage then current will flow to both batteries problem is that if the batteries are different capacity/connectivity then it will charge netiher of them efficiently which is where dctodc charging comes in as that just uses your main battery as a pwoer source to run a multistage chagrer
so again if you apply a voltage to your 12n socket current will flow to both the main battery and the charger
the watch out is if your dcd to dc chrger is say a 30amp one it will invariably open up the charge cycle by going into a Bulk phase which will pull a load of current. maybe more than your chrage and 12N wiring can supply/cope with. some will allow you to limit the current they will open up the cycle at05 D3 V8 HSE, LR Passion tree bars, wildbear compressor guard, LRP switch panel, ARB rear locker + compressor, Trigger 6 shooter electrical system
12 RRS SDV6 HSE (Hers) - Gone and replaced with an I Pace - I can tell you now EV is not the future yet
Metalian Camper trailer
20th Jul 2021 1:52 pm
Kelvo
Member Since: 07 Aug 2015
Location: Perth WA
Posts: 264
Member Since: 07 Aug 2015
Location: Perth WA
Posts: 264
gstuart wrote:
Many thks, alas though didn’t realise at first it won’t work with smart alternator so that one is out
So been looking at some of the B2B ones, do like the victron but blimey some are very expensive
Or maybe a solid state relay
Interesting fact, when Land Rover fitted a dual battery system to police/armoured/special vehicle build Discovery 4s they use a VSR.
The only time a DC-DC is required is if you are charging a lithium battery.MY14 TDV6
20th Jul 2021 1:56 pm
Duc750
Member Since: 07 Aug 2017
Location: northampton
Posts: 305
But when landrover fitted dual battery systems they fitted them in pairs using the same size battery and chemistry
*Edit or at least they would argue comparable load on the auxiliary battery to the main.05 D3 V8 HSE, LR Passion tree bars, wildbear compressor guard, LRP switch panel, ARB rear locker + compressor, Trigger 6 shooter electrical system
12 RRS SDV6 HSE (Hers) - Gone and replaced with an I Pace - I can tell you now EV is not the future yet
Metalian Camper trailer
20th Jul 2021 1:58 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13612
A million thks for the awesome details, indeed the main battery is 100 amps and leisure 75 amps
Many thks , no disrespect but would like to buy a new one
Ref the 12s, indeed wonder why it didn’t charge both batteries using the T max system, would be awesome if I fitted a B2B it did
Thks again for the very interesting data , very grateful
Member Since: 07 Aug 2017
Location: northampton
Posts: 305
The renogy one being 40amps will charge the battery much faster than the 18 amp one.
Personally I rather like Victron products but Sterling are also well worth a look
The Isolated Victron you could easily set to turn off with the ignition so you would not charge your leisure battery when plugging in the 12n socket - which in real terms is actually the best outcome.
It means your start battery would be charged properly by the charger every time and your leisure battery would be maintained whenever you start up
its a neat little unit and you don't need the smartpass as you don't want to be boosting your start battery off a leisure battery if you want to live to a decent age05 D3 V8 HSE, LR Passion tree bars, wildbear compressor guard, LRP switch panel, ARB rear locker + compressor, Trigger 6 shooter electrical system
12 RRS SDV6 HSE (Hers) - Gone and replaced with an I Pace - I can tell you now EV is not the future yet
Metalian Camper trailer
20th Jul 2021 8:38 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13612
Bless u for the help , very grateful to u
U mention the 12n socket , didn’t realise I could use that as I’ve been using my 12s socket for charging
Currently only the main battery will charge so by the sounds of it that’s the best thing to do, did originally want to charge the leisure battery to charge as well but will leave that as it is then with just charging the main battery
Wondered that if the higher amp modules would charge quicker , many thks as that answers that
Like the idea of the CTEK with the MPPT as I want to later on fit a solar panel , reason being I sometimes don’t use the disco for 1-2 months , so having something like a 100 watt solar panel on the roof to keep the Main battery topped up would be perfect , also have a CTEK charger so thinking if it would be best then to keep all of it the same make so don’t get any compatibility issues between different units
Thank u with regards to the smart pass in not needing it , I wouldn’t have known that
Once again very grateful for the help with this , won’t get the units till around September time , will also look into the charging via the 12n socket
Just reading this and what set up I need , main battery is 100 A , Aux is 75 A
Member Since: 07 Aug 2017
Location: northampton
Posts: 305
You have a D3 don't you ? In which case its a stupid alternator not a smart one
sorry I mean the grey one - i can never remember which is S or N All my vehicles are 13 pin now and have been for some time or 7 pin and Anderson for trailer power
The higher amp ones will charge faster for sure as they can deliver more current but you may not need that faster charge rate in truth - the current has to come from somewhere after all and you do have a finite output from the alternator.
Logically if you have a 75 aH battery do you regularly drain 30 amps out of it and need it back to fullish within 2-3 hours of driving you probably do need a 40 amp charger but if the usage is lighter or more irregular a lower current charger will do the job absolutely fine and leave more headroom for the alternator to charge the start battery and run the car electrics.
Having a big scary charger is great to charge your aux battery if you have a big scary main battery and a big scary alternator.
I've not looked on a diesel D3 but its amazing the current draw on an sdv6 just from having the ignition on - that will hit the start battery very hard05 D3 V8 HSE, LR Passion tree bars, wildbear compressor guard, LRP switch panel, ARB rear locker + compressor, Trigger 6 shooter electrical system
12 RRS SDV6 HSE (Hers) - Gone and replaced with an I Pace - I can tell you now EV is not the future yet
Metalian Camper trailer
21st Jul 2021 9:48 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13612
Hi
Bless u , ah apologises getting confused , thought the D3 had a smart alternator ,
No worries ref the S or N , just thought I had missed something , lol
I intend to fit a fridge so not very high usage , this is what CTEK said about the solar
We recommend you to install 50W to 300W solar panels with a open circuit voltage of max 23v (VOC). Check solar panel spec.
So will check what something like a 100w panel will produce with regards to voltage
Have an app that I can test the cranking voltage so will indeed be interesting to see what it is
Thks again for the awesome help, really am grateful to u
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though
All my vehicles are 13 pin now and have been for some time or 7 pin and Anderson for trailer power
