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Old 02-20-2015, 09:15 PM   #1
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Default questions for wincrasher - Promaster battery

Hi wincrasher,

i have a question about not starting my new van.

how long have you been able to not start your van before the parasitic loads deplete the starting battery to long to start? do you think in general i could get away with 2 weeks?

just wondering-i will be parking the van 8 miles from where i live.
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Old 02-21-2015, 12:17 AM   #2
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Default Re: questions for wincrasher

Quote:
Originally Posted by gerrym51
Hi wincrasher,

i have a question about not starting my new van.

how long have you been able to not start your van before the parasitic loads deplete the starting battery to long to start? do you think in general i could get away with 2 weeks?

just wondering-i will be parking the van 8 miles from where i live.
When I first got it, I let it sit for a couple months and it still would start. But since then, I always have left it on a battery tender. I'm sure the radio/gps and the alarm system have some kind of parasitic draw.

On the dash, there is also a switch to join the automotive 12v system with the coach 12v, so that you could start the engine off the house battery (technically both house and chassis).

If there is no 110v service where you are storing the van, then you could get a small solar panel and leave it on the dashboard to trickle the chassis battery.
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Old 02-21-2015, 11:38 AM   #3
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Default Re: questions for wincrasher

Roadtrek had been using Sure Power battery separators.
Some Sure Power units are bi-directional.

Quote:
MODEL 1315-200 This unit will activate only when either the Main OR Auxiliary Battery System exceeds 13.2 volts*.
Are you getting solar on your Zion? If so, and if you get the right model Sure Power battery separator then both coach and chassis batteries should be maintained (if the van is stored outside).
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Old 02-21-2015, 02:02 PM   #4
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Default Re: questions for wincrasher

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Originally Posted by markopolo
Roadtrek had been using Sure Power battery separators.
Some Sure Power units are bi-directional.

Quote:
MODEL 1315-200 This unit will activate only when either the Main OR Auxiliary Battery System exceeds 13.2 volts*.
Are you getting solar on your Zion? If so, and if you get the right model Sure Power battery separator then both coach and chassis batteries should be maintained (if the van is stored outside).

i'm getting 2 100 watt solar panels-i will probably plug a 5 watt solar tender type into the 12 volt dash panel. i've looked a several models
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Old 02-21-2015, 02:19 PM   #5
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Default Re: questions for wincrasher

If the battery separator is bi-directional then no need for anything else.
It would be easy to check. Just park the van in the sun. Let it sit for a bit, use the dash radio, use chassis lights etc. to remove any surface charge on chassis battery. Then check chassis battery voltage. If the voltage is 13.2v or more then you know both batteries are being maintained as built by Roadtrek. If not then a chassis battery solar tender could be what you need.
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Old 02-22-2015, 02:16 PM   #6
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Default Re: questions for wincrasher

Wincrasher

another question.

Does your OBDll port supply power when the promaster is turned off? i'm looking to use a trickle solar panel that uses the obdll port. thanks
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Old 02-23-2015, 08:12 PM   #7
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Default Re: questions for wincrasher

Quote:
Originally Posted by markopolo
If the battery separator is bi-directional then no need for anything else.
It would be easy to check. Just park the van in the sun. Let it sit for a bit, use the dash radio, use chassis lights etc. to remove any surface charge on chassis battery. Then check chassis battery voltage. If the voltage is 13.2v or more then you know both batteries are being maintained as built by Roadtrek. If not then a chassis battery solar tender could be what you need.

Mark, after checking with roadtrek i believe you are correct-thanks
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Old 02-23-2015, 09:07 PM   #8
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Default Re: questions for wincrasher

That's great Gerry. Assuming that RT is using the 1315-200 model then this is a summary of how it works (edited copy paste):

The BATTERY SEPARATOR monitors the battery system to determine if the batteries are being charged. When the engine or auxiliary batteries (model 1315-200 is used), reach 13.2 volts, indicating charging is taking place, the BATTERY SEPARATOR will engage, joining the two battery banks. If the drain on the charging system by the auxiliary or main battery bank reduces the system voltage below 12.8 volts, the BATTERY SEPARATOR will disconnect the battery banks from each other, thus protecting the respective battery banks from excessive drain.

A delay function has been incorporated in the control circuit to prevent the BATTERY SEPARATOR from reacting to momentary voltage fluctuations and chattering.


rockymtnb pointed out that there is some current loss with that model - link: http://www.classbforum.com/phpBB2/vi...tart=22#p26017 - but that shouldn't affect what you need it to do which is maintain two already charged batteries.

I'm assuming that coach and chassis batteries will be near full charge when you park the van in storage after driving there. Use the coach battery disconnect as intended for storage and make sure the inverter is off.

It will work that way when you plug in also.
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Old 02-24-2015, 03:02 PM   #9
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Default Re: questions for wincrasher - Promaster battery

The Auxiliary Start Connection is optional - meaning that there are additional installation steps required for it to work. Do you know if RT installed it that way?
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Old 02-24-2015, 04:23 PM   #10
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Default Re: questions for wincrasher - Promaster battery

At least on the older Roadtreks like our 07 Chevy, the auxiliary start is not connected on the separator, but the connection is there. I was told they didn't connect it because the wiring from the coach is not large enough to handle van starting current, which it isn't. If they have big enough wiring in the Promaster or other newer models, I think all it takes is putting 12v on that start connection to close the separator. There is a downside of having the auxiliary start switch, though. If you forget it on, you will put a good sized load on all you batteries. Our separator pulls around 1.4 amps when closed, so you could go flat on everything if the van sat a while
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