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Old 10-02-2020, 02:25 PM   #1
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Lithium Batteries & Vansco Multiplex VMM 2820

2005 Alpine Coach 36' FDDS (2002 Saturn LW 200 Toad)

Lithium Batteries & Vansco Multiplex Module VMM 2820
Solar & Battery Controller
________________________________________

My 1st post is under: Li-BIM 225 Battery Isolation manager - Lithium Batteries
This post is about: Renory Battery Isolation Manager & Battery Charger- Lithium Batteries

I have decided to use Renogy DCC50S 12V 50A DC-DC ON-BOARD BATTERY CHARGER WITH MPP (It is also a battery isolator) but I have questions.
Renogy assured me that their battery isolation system will work fine. It will charge the Lithium Batteries as they should be charged while charging the Lead Acid Batteries correctly also. It knows the difference. But they donít know if the Vansco Battery Management system should be disconnected. They think it probably should be because their system will control all the batteries and they canít see two systems trying to be in control. So, I need to know how to disconnect the Vansco from battery control. I am thinking that just disconnecting one of the control wires to the big boy solenoid is all I need to do but I don't not know how that will affect the Vansco Multiplex Module VMM 2820 system. I sure don't want to get that messed up. If someone who knows can tell me that it would be appreciated.
This controller also eliminates the solar panel controller as you can see on the wiring diagram.
You can log on to this webpage which will answer a lot of questions.
https://support.renogy.com/en/suppor...5795-dc-dc-faq
Renogy DCC is50S = https://www.renogy.com/dcc50s-12v-50...ger-with-mppt/
Any other comments or suggestions would be appreciated.
Also - If I have forgotten anything please let me know.
Thanks Ė TJ Shively
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Old 10-02-2020, 02:33 PM   #2
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Hello,
I have the 20A Renogy DC to DC charger installed. It works fine.
I also disconnected the control wire from the charge bridge. Nothing else to do really. Been happy with that for the past 12 Month.
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Old 10-02-2020, 02:58 PM   #3
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Does the wiring diagram I posted look like what you did?
Are there any other changes in the wiring I need to know?
Thanks for your info - it is appreciated.
TJ
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Old 10-02-2020, 03:07 PM   #4
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Quote:
Originally Posted by tjshively View Post
Does the wiring diagram I posted look like what you did?
Are there any other changes in the wiring I need to know?
Thanks for your info - it is appreciated.
TJ

Hi TJ,
My wiring was a bit more complex as I also use a temperature controller that enables / disables the power to the lithium charging. I looked over your diagram above and it looks good to me. The only item I would double check on your coach is where the alternator charging wire hooks up to. Just double check that the lithium side is really isolated from that. On my coach someone had creative ideas that I had to correct first.
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Old 10-02-2020, 07:45 PM   #5
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Looks like you're making great progress TJ!!

What's the rating (Voltage and amps for the MPPT side of the unit?)

How much solardo you have?
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Old 10-07-2020, 06:52 PM   #6
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Alpine06 -- Could you post a photo of where you located your Renogy DC-DC.
I'm trying to figure the best location but you have already done that.
Send me a PM or just email me the photo - tjshively@gmail.com
Thanks
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Old 10-07-2020, 08:14 PM   #7
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Yes sure I will make a photo in the morning. Itís on the left side under the ABS system I think the module says WABCO on it.
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Old 10-08-2020, 08:48 AM   #8
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Quote:
Originally Posted by tjshively View Post
Alpine06 -- Could you post a photo of where you located your Renogy DC-DC.
I'm trying to figure the best location but you have already done that.
Send me a PM or just email me the photo - tjshively@gmail.com
Thanks
Picture is in your email inbox. Tapatalk did not let me post it via mobile device as it was too big of a file.
Also note that I used some Aluminium standoffs to mount it. I drilled into the metal side wall and just cut a tread. Also I used some thread lock to make sure it stays put.
Good luck
Joerg
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Old 03-04-2021, 11:07 AM   #9
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It's been a long winter here in Cincinnati. I got the Renogy DC-DC unit connected but it seems that I still have a small problem. At least I hope it's small. When I first out at low RPMs the Dashboard only reads 11 VDC or so but when I get on the expressway it pops right up to 14.4 VDC. I have a Delco Remy 28Si alternator so I called their tech support and he said that it looks like I don't have the REMOTE SENSE wire connected correctly. I have tried to trace that wire with no luck.
He suggest I just run a new wire from the alternator directly to the positive post on the engine start batteries. He said that with the wire not connected correctly the alternator at RPMs will put out a constant 14.4 VDC and it appears that is what is happening.
Do you have any suggestions- or - should I just run the wire?
Thanks
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Old 03-04-2021, 02:08 PM   #10
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... and that is why we escaped to Florida beginning of Dec. on our way back ... slowly.
So I think if this is something that just occurred now then you do want to trace your old wire as it must have gotten damaged / disconnected somehow. I say that because it has battery power on one side and it might not be fused.
Just saying.
All the best Joerg
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Old 03-04-2021, 02:58 PM   #11
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….not sure but pretty sure all pre-Vansco Alpines came with a DuVac alternator which required 4 wires: 2 larger= 1- plus, 1- minus; and 2 smaller=1- ignition, 1- sense. Never had to do the swap out but always wondered about the wiring config on a Delco-Remy 28i????? Was a sense wire required? Assuming you have 4 wires, one smaller [sense wire] should be 12+/- all the time....
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Old 03-04-2021, 06:13 PM   #12
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My 2006 has a Prestolite Leece Neville model#
8LHA2070VE
By the date on it I am sure itís the original.
This model is self exiting so no IGN. Wire.
It also has no remote sense. Makes for an easy install.
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Old 03-04-2021, 07:22 PM   #13
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Alpine06--that is where I was headed--not sure by 2005 Alpines even had a sense wire? So is the OP's 28Si a 2-wire or 4-wire --seems the Delco Remy tech thought he has one--I am confused???
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Old 03-04-2021, 07:50 PM   #14
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They use sense wires for better battery voltage reading to the voltage regulator.

If you read the voltage at the battery its a more accurate reading then reading it at the output of the alternator, especially under higher amp loads. It elemenates any voltage drop.

As a shortcut on the Delco, you can use a short wire from the alternator output terminal to the sense terminal. A common trick on the smaller Delco alternators.
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