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Old 01-17-2019, 01:24 AM   #1
comfortablylost
 
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Arrow Charging house lithium from alternator via Enerdrive DC2DC

Hi all

I have searched and also asked in my local FB group but haven't found enough info to proceed with the install. I want to get it all hooked up and working within the next month.

We have a 4cyl diesel 2013 NCV3 Sprinter here in Australia.

It has a 14V/180A Valeo 3-phase "smart" alternator, and a stock 95Ah deep cycle starter battery.

The house battery is a 12v, 200Ah pack of Winston lithium phosphate (LFP).

The LFP is currently 100% powered by my solar panels via a Victron MPPT controller.

I have bought a 40A Enerdrive DC2DC+ charger so I can charge my house battery from the alternator to help keep it charged up during winter, as we live in the van full time.

We will be charging the LFP at 35 or 40A max from the DC2DC charger. The charger also has custom outputs so I can dial it in to work perfectly with my LFP battery.

The DC2DC needs a trigger from the ignition cable when being used with a LFP battery. That's all good, as I recall there being a ignition cable hook up point under the driver's seat (remember we are in Oz and have the steering wheel on the right side).

The power feed cable will come directly from the starter battery, via the inline fuse box which is inside the battery box next to the battery positive cable. I will run the cable under the floor and over to the LFP which is in a battery box just behind the driver's seat.

The part where I am still unsure is how/where to attach the negative cable for the DC2DC device. On the user install guide and schematic for the Enerdrive DC2DC battery charger it asks to be connected to the "vehicle" side of the starter battery's negative cable.



How can I do this? What is the best approach?
Do I run the DC2DC negative cable to the factory chassis negative point/bolt that is located underneath the driver seat? Or does it need to be attached closer to the starter battery negative terminal?

Many thanks.
Attached Files
File Type: pdf DC2DC-In-Vehicle-Installation.pdf (390.5 KB, 17 views)
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Last edited by comfortablylost; 01-17-2019 at 01:30 AM.
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Old 01-17-2019, 02:03 AM   #2
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

Enter your VIN to https://www.datamb.com/ to see if you have the "EK1" option.
If you do, you will have three terminals under one of the seats, which provide you with:



... under a plastic flip-cover. The "D+" signal goes to 12v when the alternator is providing power, use it as a signal.

As for the ground, yes .. the factory bolt positions are a good way to go (especially if you also have the E30 "quick disconnect" for the starter battery's negative cable).

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 01-18-2019, 12:23 AM   #3
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

That looks a lot like the KISAE DMT-1230 I just ordered. It was a tough choice between that and the CTEK unit. Since my order - I've learned of a couple issues/questions that I need answers for before I install.
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Old 01-19-2019, 06:59 AM   #4
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

From the engineer at Enerdrive:

Quote:
"You will notice there is no input negative installed in this diagram, but the batteries you are charging shows a negative to chassis cable. This makes the chassis the negative ground path for the DC2DC charger and allows the smart alternator sense module to register the DC2DC charger.

If you are installing in a “towed” application like a caravan/camper trailer, then you need to install the input negative."
So, essentially, the only negative cable I need to run to the chassis is from the house battery to the factory chassis mount point under the driver seat.
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Old 01-19-2019, 07:07 AM   #5
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

Quote:
Originally Posted by autostaretx View Post
Enter your VIN to https://www.datamb.com/ to see if you have the "EK1" option.
If you do, you will have three terminals under one of the seats, which provide you with:

... under a plastic flip-cover. The "D+" signal goes to 12v when the alternator is providing power, use it as a signal.

As for the ground, yes .. the factory bolt positions are a good way to go (especially if you also have the E30 "quick disconnect" for the starter battery's negative cable).

--dick
Yep, the van has the EK1 and E30 option.

I plan to use the ignition attachment point for the DC2DC.

Quote:
EK1 TERMINAL STRIP FOR ELECTRICAL CONNECTION
Thanks for the link btw, I didn't know that existed and it helps a lot to be able to look up what the van has. For example I had to email MB in Aus last time just to find out what alternator my van has. That VIN lookup tool make it so much easier.
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Old 01-19-2019, 07:17 AM   #6
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

Quote:
Originally Posted by mtncrawler View Post
That looks a lot like the KISAE DMT-1230 I just ordered. It was a tough choice between that and the CTEK unit. Since my order - I've learned of a couple issues/questions that I need answers for before I install.
IIRC CTEK doesn't have programmable output settings like Victron and Enerdrive do?

So probably not great for custom lithium battery setups?
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Old 01-19-2019, 11:42 AM   #7
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

Right - CTEKs are designed for AGMs and other FLA’s.


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Old 01-19-2019, 06:32 PM   #8
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Default Re: Charging house lithium from alternator via Enerdrive DC2DC

Quote:
Originally Posted by comfortablylost View Post
Thanks for the link btw, I didn't know that existed and it helps a lot to be able to look up what the van has.
(that's for me, not for you)

I'll add the link to my signature block (after having typed it into innumerable postings)

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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