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  #49  
Old 11-26-2014, 04:28 AM
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Re: The MY14 2nd Battery and DC Thread

Quote:
Originally Posted by allypally View Post
Sounds like it is working as designed. That is why it is called variable.
Gee thanks Ally,

I was under the impression that when the car would start from cold it would go high 14.4 then lower or stay high depending on what was being used etc.

I drove the other day for an hour and it never dropped off 14.4Vdc, then another day it never went above 13.5Vdc, more curious than anything as to the charging cycle etc.

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  #50  
Old 11-26-2014, 07:50 PM
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Re: The MY14 2nd Battery and DC Thread

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Originally Posted by chocco View Post
Finally got the the isolator in I have been busy. Works as it should no problems so far and the guy that makes them was extremely helpful.


The weird thing is variable alternator output same situations yet one time it puts out 14.4Vdc and others 13.5Vdc, even when starting the car from cold. I have been monitoring the Vdc via Torque, anyone else seen this, just wondering if I may have a alternator issue.


Cheers
Ally is right. The alternator cuts in only when needed to charge the battery. The 14.4V is probably with the alternator charging and and the 13.5V the fully charged battery only. The regulator, if they still have such a thing, does the cutting in and out as required. The most critical thing for you is the current your isolator is able to deliver to the take-off points for your caravan or aux battery.
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  #51  
Old 12-23-2014, 12:04 AM
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Re: The MY14 2nd Battery and DC Thread

Hi all electrical geniuses out there. I thought I was on a winner after purchasing the Thumper Elite 110. The main feature was portability and the ability to charge on the run and use solar when stationary.

Details of the Thumper for in-car charging:


· “50AMP VEHICLE CHARGE ONLY” ANDERSON – Fitted with In built isolator – rated to 50Amps

This 50Amp Anderson connector is linked to its very own internal isolator, built inside the Thumper Elite itself! This outlet will allow you to connect a charge line through the vehicle, directly off the main battery with nothing but a circuit breaker – The Elite will isolate itself completely without the need of installing an additional isolator to the vehicle. This feature is a perfect option for company vehicles or newer vehicles where it is difficult to locate or link into an ignition acitivated source.

The Elite will have a disconnect voltage of approx 12.7 Volts – it is at this point that the Elite will isolate itself from the charging source.

The reconnect voltage of the Elite is approx 13.1Volts – making it the perfect companion for the newer vehicles with low alternator voltage or voltage sensitive alternators.

The “50Amp Vehicle charge only” line can be used with a DC charger if required, however, we have found with experience that many vehicles do not neccessarily require the use of DC Chargers.

I am finding that the charge rate from the vehicle varies between 13-14 V. If I am lucky, I get 14 V and the Thumper works fine. More often, the vehicle produces 13 V and I get no charge. I simply have an 50 A inline fuse from the main battery connected to the Thumpers receiver kit which relays to the Thumper via an Anderson plug.

ImageUploadedByJeepGarage1419314389.339893.jpg

I already have a secondary setup for my Camper Trailer which works fine regardless of the voltage. I'm hoping to not need a further DC charger in the cabin for the Thumper.

Total setup in boot below leaving heaps of room for other items.

ImageUploadedByJeepGarage1419314624.735094.jpg


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  #52  
Old 12-23-2014, 12:31 AM
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Hi Butts,

I have been doing some more testing now that I have the SRT screen on my Uconnect and I think and yes it did hurt and dont flame me for what I am about to theorize here is that there may be some sort of temperature compensation on the charging circuit similar to the DC aystems that I work on. I have found when it is cooler I can get 14Vdc no problems but when i get into the 30deg area I cannot get over 13Vdc, eg: drove for an hour the other day 33deg never went over 13Vdc, thats A/C, headlights and stereo all going.

Cannot see a temp probe in or around the battery so not sure how or what gauge it is using.

I am at a loss but I am going to have to rewire my Jayco fridge or else it may be warm when I get to the end of our trip !
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  #53  
Old 12-23-2014, 01:02 AM
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The MY14 2nd Battery and DC Thread

Quote:
Originally Posted by chocco View Post
Hi Butts,

I have been doing some more testing now that I have the SRT screen on my Uconnect and I think and yes it did hurt and dont flame me for what I am about to theorize here is that there may be some sort of temperature compensation on the charging circuit similar to the DC aystems that I work on. I have found when it is cooler I can get 14Vdc no problems but when i get into the 30deg area I cannot get over 13Vdc, eg: drove for an hour the other day 33deg never went over 13Vdc, thats A/C, headlights and stereo all going.

Cannot see a temp probe in or around the battery so not sure how or what gauge it is using.

I am at a loss but I am going to have to rewire my Jayco fridge or else it may be warm when I get to the end of our trip !

Hi Chocco, I'm travelling around SW WA and it's not hot at the moment, barely reaching 20 deg. Temperature doesn't seem to matter. It's a lottery at which level of charge I'm at. The other day it started at 14 V and then reduced to 13 V about 1 hour into the drive. I've tried by disconnecting the thumper so it doesn't drain any charge while the engine isn't running to see if the residual level in battery effects the start point.


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  #54  
Old 12-23-2014, 01:21 AM
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When I go away I am going to add temprature to my logging which will be about 10 hours of driving thru different temps etc and I will vary the load so on the way back the fridge will be off..

The guy I bought the isolator off said he can change the volts from 13.1 to 12.9 but will wait and see what the trip shows up once I have some data.
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  #55  
Old 12-23-2014, 01:30 AM
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Could be just as simple as the guys said early the battery doesnt need charging, which is the most likely explanation, so into eco mode it goes.
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  #56  
Old 12-23-2014, 04:35 AM
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Re: The MY14 2nd Battery and DC Thread

Quote:
Originally Posted by chocco View Post
Could be just as simple as the guys said early the battery doesnt need charging, which is the most likely explanation, so into eco mode it goes.
I have a 75ah Thumper with a 600w inverter on top, connected via the separate isolator from the same supplier as the Thumper. We spent 10 weeks in the Kimberley, running the fridge, lights when camping, Chargers and a TV, for up to two days. Thumper voltage would get down to the low 10v's on occasions. Temperatures into the hi 20's to high 30's.
From the regular Jeep display, I correlated the voltage with the degree of discharge of the Thumper. If I hadn't discharged it much, the car would start at and stay at 13v. If it was significantly discharged, the voltage would spend 1 - 2 hours at 14v, then change to 13v.
Although I wasn't convinced by their line that wiring the Thumper in parallel with the car battery would cause the intelligent charging system to look at the combination as one battery and charge accordingly, that is what seemed to happen. In any case, I have had no problems to date.
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  #57  
Old 12-23-2014, 04:47 AM
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Thanks Russell,

My problem is if the battery is charged and the volts sit below 13.1 fridge in the van wont work because Jayco see fit to tap off before the charger/controller/battetys in the van for the DC feed to the fridge. So I am going to run a seperate feed from the 2 180amp batterys to the fridge so I will have constant voltage even if the volts drop out.

Thanks for the response though to my far fetched theorys.😊
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  #58  
Old 12-23-2014, 04:55 AM
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Re: The MY14 2nd Battery and DC Thread

Hi Russell, I'm seeing the same issues and of the same theory. If the thumper is seen in parallel to the main battery and has enough charge, then it's happy at 13 V. I am assuming that the display is doing a lot of rounding up/down of actual figures, but when you are running your Engel as your freezer, it would be good to have this constantly being charged so when you arrive at an overnight stop without power, the thumper has enough in store to get you through the night.


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  #59  
Old 12-23-2014, 12:55 PM
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Re: The MY14 2nd Battery and DC Thread

Not sure how relevant this is, but after a couple of hours driving, maybe three if it was down around 11v, the thumper display will always show in the low to mid 13's. The only time I see higher than this is when I've charged it overnight on a 240v charger. And this seems to make a difference. I've guessed I get about half a day's extra use after a 240v charger. ( I don't run the fridge as a freezer). It would be nice to have another significant digit on the Jeep display...
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  #60  
Old 08-20-2015, 04:30 AM
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Re: The MY14 2nd Battery and DC Thread

Anyone used one of these DC-DC charges.

Battery TO Battery Charger 12V 30A MK2 Charger DC TO DC DC DC NO Volt Drop Solar | eBay

After reading this thread it seems to be the most reliable way to charge the van battery. Instead of using Isolaters and very bulky battery cables.

Planning to use 8B&S twin core from battery to 50amp Anderson plug. Then run some more 8B&S twin core from Anderson plug at front of van to DC-DC charger located next to van battery. Much like diagram 1 in the EBAY listing.

Any comments or other alternatives ?????
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