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Old 06-13-2014, 09:21 PM   #29
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Originally Posted by paullovern View Post
We upgraded the inverter/charger on our 2013 AI and had an Magnum ARC remote display and a BMK battery monitor kit professionally installed. We charged it up for four days until the BMK showed 100% state of charge (SOC). On a recent trip we drove 10 hours from St Augustine to Nashville with only the inverter and the fridge operating. Upon arrival at the campsite in Nashville, the BMK showed an SOC of 62%. From reading previous posts, I surprised that with inverter on, the fridge was operating on AC and discharged the batteries. However, I was surprised that the alternator on the engine didn't keep the battery bank topped off. The next day we drove from Nashville to Chicago (8 hours) with the inverter off to force the fridge to use the DC 12 volt source from the alternator. We tried to turn on the charger on the ARC but it wouldn't turn on. After the 8 hour drive, the SOC was still at 62%. Any ideas? I thought that the house battery bank was charged while driving.

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Airstream Interstates don't have a propane refrigerator. It's a DC compressor unit with a built in AC to DC converter. For some strange reason Airstream plugs the AC cord on this refrigerator into an outlet under the galley sink powered by the inverter. This weird arrangement has been discussed before on this forum.

The battery isolation manager (BIM) will allow Sprinter alternator to charge the coach batteries when driving. But this is just a single voltage charge without temp compensation so it will never get your coach batteries fully charged. Your SOC at 62% seems low. You should check the connectors on the BIM. It's under the rear lounge seat. Have it checked by dealer if you aren't comfortable with disassembling your rig.

Mine were loose on delivery and I started to get all sorts of strange electrical issues after driving it for a few months. The dealer's electrician told me where to look over the phone and I found the lugs holding connectors on BIM almost ready to fall off.
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Old 06-13-2014, 10:23 PM   #30
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I posted this before, but for new owners here, I unplugged the AC chord on my fridge by reaching under the tilt drawer in front of the sink. This way, it always operates on 12v. But keep in mind that I have the lounge unit with no wardrobe. You won't be able to get to the AC plug if you have the wardrobe version.
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Old 06-14-2014, 07:15 AM   #31
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I have the wardrobe version and I have access to the plug for the fridge.
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Old 06-14-2014, 09:09 AM   #32
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Inverter location

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I have the wardrobe version and I have access to the plug for the fridge.

They must have revised it for the 2014 model. I believe it was Protagonist that couldn't access the plug in his 2012 wardrobe without pulling out the fridge or something.
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Old 06-14-2014, 09:49 AM   #33
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They must have revised it for the 2014 model. I believe it was Protagonist that couldn't access the plug in his 2012 wardrobe without pulling out the fridge or something.
The 2012 lounge/wardrobe model requires that you pull the microwave to unplug the fridge from 120vAC. Or that you have arms like an orangutan so you can reach around the microwave, one or the other.
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Old 07-07-2014, 09:19 AM   #34
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See my previous post. I'd bet money that the connections are loose either on the Isolator side (mine were only hand tight on delivery) or the positive side near the chassis battery (didn't know to check for that as Airstream does not provide schematics with the unit but the tech at Airstream immediately knew what it was). Your symptoms are exactly the same as mine. That's about all it could be. Fortunately, it's a very easy fix if that is the case. The other possibility is that production mis-wired something-which is a very real possibility as well. If my first fix doesn't cure it, you will have to take it to a dealer and hope they can figure it out under warranty.


Quote:
Originally Posted by paullovern View Post
We upgraded the inverter/charger on our 2013 AI and had an Magnum ARC remote display and a BMK battery monitor kit professionally installed. We charged it up for four days until the BMK showed 100% state of charge (SOC). On a recent trip we drove 10 hours from St Augustine to Nashville with only the inverter and the fridge operating. Upon arrival at the campsite in Nashville, the BMK showed an SOC of 62%. From reading previous posts, I surprised that with inverter on, the fridge was operating on AC and discharged the batteries. However, I was surprised that the alternator on the engine didn't keep the battery bank topped off. The next day we drove from Nashville to Chicago (8 hours) with the inverter off to force the fridge to use the DC 12 volt source from the alternator. We tried to turn on the charger on the ARC but it wouldn't turn on. After the 8 hour drive, the SOC was still at 62%. Any ideas? I thought that the house battery bank was charged while driving.

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Old 07-07-2014, 03:38 PM   #35
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The Magnum's charger section only works when 120VAC is present. If your generator was not on, the Magnum will have no AC current and will not charge your batteries.


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