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Old 09-04-2015, 12:18 PM   #29
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Great. Will do THX!
AM couldn't help. incredibly difficult to find anyone to install a charge controller on an RV in Chicago area. I have one (mostly residential) solar company now that is telling me they can probably do it, but they're leery of access to the underneath of the RV, and trying to figure out how long it will take them.

Also ...I haven't been able to tell them which controller other than saying Morningstar would probably be good, 3-stage of course.
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Old 09-04-2015, 12:27 PM   #30
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AM couldn't help. incredibly difficult to find anyone to install a charge controller on an RV in Chicago area. I have one (mostly residential) solar company now that is telling me they can probably do it, but they're leery of access to the underneath of the RV, and trying to figure out how long it will take them.

Also ...I haven't been able to tell them which controller other than saying Morningstar would probably be good, 3-stage of course.
In my experience, most residential solar installers don't have a clue as to how an RV electrical system functions.

You might be better off seeking out a well qualified car stereo installer with a better understanding the RV's DC electrical system.
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Old 09-04-2015, 02:30 PM   #31
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hmm ok, that's an interesting suggestion
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Old 09-20-2015, 12:50 PM   #32
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Proper temperature compensation for battery charging should accurately measure the cell temperatures at the battery and not the ambient air temps. They can vary dramatically........ and with it the charging voltages that the sensor should be controlling. This is why Magnum and Blue Sky require their temp. sensors be secured to a negative battery terminal for accurate measurements.
Is that true ... the existing controller is only about a foot away from the batteries? The AM service guy I'm corresponding with to expand my system wants to know where the batteries and controller are on the 2015 AI Grand Tour EXT. I told him the batteries are underneath, behind the rear wheels, driver's side But I didn't know where the controller is.
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Old 09-20-2015, 03:00 PM   #33
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Is that true ... the existing controller is only about a foot away from the batteries? The AM service guy I'm corresponding with to expand my system wants to know where the batteries and controller are on the 2015 AI Grand Tour EXT. I told him the batteries are underneath, behind the rear wheels, driver's side But I didn't know where the controller is.
The solar controller is identified as M4c2 in the wiring diagrams. See attached clip from the 12V DC wiring diagrams. If you then look for that code (M4c2) on the GT 12v Layout diagram in the 2015 Owners manual you see that the controller is located inside the roadside compartment that covers the rear wheel behind the bath cabinet on the GT model.
Hope this helps.
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Old 09-20-2015, 03:26 PM   #34
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New Battery Location

Since we are speaking of the location of components - I noticed that all the new Interstates have their batteries in the same location. It's the location first offer in the Grand Touring models under the rear roadside corner of the van. I was at the Hersey show this week and got some pictures of this new battery location. The attached photo is the best overview shot. This location offers easy access to the batteries.
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Old 09-20-2015, 04:12 PM   #35
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Since we are speaking of the location of components - I noticed that all the new Interstates have their batteries in the same location. It's the location first offer in the Grand Touring models under the rear roadside corner of the van. I was at the Hersey show this week and got some pictures of this new battery location. The attached photo is the best overview shot. This location offers easy access to the batteries.

They appear to be located on their side. I wonder how easy it would be to upgrade them to larger 6 Volt batteries.


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Old 09-20-2015, 06:49 PM   #36
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Yep that's where mine are 2015 AI GTExt
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Old 09-20-2015, 06:50 PM   #37
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The solar controller is identified as M4c2 in the wiring diagrams. See attached clip from the 12V DC wiring diagrams. If you then look for that code (M4c2) on the GT 12v Layout diagram in the 2015 Owners manual you see that the controller is located inside the roadside compartment that covers the rear wheel behind the bath cabinet on the GT model.
Hope this helps.
Yes ... very helpful. THANKS
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Old 09-20-2015, 07:36 PM   #38
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They appear to be located on their side. I wonder how easy it would be to upgrade them to larger 6 Volt batteries.
Yes - the batteries are on their side, short side down, on a simple tray attached to the inner side of the Sprinter van substructure. There is a separate tray for each battery and they look like a very tight fit. I took the pictures because I want to add my new batteries in the same location. But I'm going to make my own trays that will each hold two Lifeline GPL-4CT 6V batteries, long side down. I plan to add a tray on each side for total of four 6V batteries of 440 AH.

The way Airstream installed these batteries they hang below the Sprinter sheet metal, just above the plastic trim. Mine will be above the sheet metal better protected from possible damage.
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