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Old 04-15-2016, 07:38 PM   #1
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Batteries at 11 volts

Ok so I put my 2016 AS in storage and put the switch into store. I then hooked up the batteries to a 10w solar battery tender which in the past keeps my batteries charged. (I live in sunny So Cal) I checked on the batteries 2 weeks later using a multimeter and the batteries are at 11 volts. I looked around and noticed I left the inverter on. Stupid me.
I have no way to hook up the AS to shore power unless I hook it up to my tow vehicle and take it to a campground. I figure I will bring my generator to the storage facility and plug it in for 2 hours while I watch a movie on my iPad waiting. Will that do anything or am I wasting my time. Last resort I can unhook my batteries and bring them home to charge.
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Old 04-15-2016, 07:59 PM   #2
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Taking the batteries home to charge seems simplest, most efficient, and sure to give you the result you want with the least effort. Plus you can keep the batteries at home until you want to use them.

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Old 04-15-2016, 08:04 PM   #3
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I vote for the generator. That's easier than yarding the batteries out, taking them home, putting them on a charger, taking them back to the trailer, then reinstalling them.

A couple of hours on the generator should bring them up to a point where your small solar panel can maintain them (provided you turn everything off).
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Old 04-15-2016, 08:40 PM   #4
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Generator can easily run you a $grand. Cost of taking the batteries home to trickle charge potentially zero if you already have quality charger. Your choice of course.
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Old 04-15-2016, 08:49 PM   #5
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Either way, I would act ASAP as your batteries will begin to sulfate at that low a voltage level.

Sulfation is a process that occurs in weak batteries when the sulfur contained in the sulfuric battery acid begins to precipitate from the liquid acid solution and starts to crystalize onto your battery plates. This is NOT GOOD!Ö. as it will degrade the overall performance of your batteries.

A controlled overcharge (called equalization) will usually scrub the plates of the sulfur crystals and re-integrate them into the acid, but this is also a tricky maneuver.

Best to keep those batteries above 12.2VDC and charge them as sson as they begin to get depleted.
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Old 04-15-2016, 08:51 PM   #6
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Bringing my generator seems to be the easiest solution and I get to knock out a few episodes of House of Cards while I wait. I just wasn't sure if the generator plugged in for a few hours would do anything to depleted batteries.
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Old 04-15-2016, 09:01 PM   #7
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Bringing my generator seems to be the easiest solution and I get to knock out a few episodes of House of Cards while I wait. I just wasn't sure if the generator plugged in for a few hours would do anything to depleted batteries.
Do you have the stock converter?

If so, I would use a quality charger with automatic 3-stage charging connected directly to your batteries. If you don't have one, your can either rent one from some auto parts stores or ask around to borrow one. Look for one with a minimum of a 40-50 amp charge rate. This should re-charge your batteries properly, at the correct voltage (which is NOT the 13.6VDC that your parallax unit provides) in 2-3 hours. They should be getting a minimum of 14.6VDC for the bulk/absorb phase IF you also have the OEM batteries.

Also bring a gallon of distilled water with you, as you will probably need to re-fill the cells after the vigorous re-charge.
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Old 04-15-2016, 09:07 PM   #8
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It depends on how much charge current the converter can put into the batteries as weather the generator works good or not. A good experiment. Electricity from gasoline is many times more costly than from a home outlet though. If you take the batteries home always handle dead batteries very gently because the lead will fall of the plates more easily when the batteries are dead than when they are fully charged.
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Old 04-16-2016, 11:54 AM   #9
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If going to store for a time, take the 30 minutes and take out your batteries and keep at home with a good 3 stage charger.

Once they are below 9 to 10 you might as well replace, damage has already been done.

I learned this the hard way also, the last place you need to be is on a trip and need to replace them.

There are many things that take a charge to run, like you frig.

I did take my down interstate and one was bad, keeping one for a backup which is nice to have.
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Old 04-16-2016, 12:18 PM   #10
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Don't expect your battery to be good as new after taking it so low.
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Old 04-16-2016, 09:20 PM   #11
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Maybe bring them home and leave them on a battery tender?
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Old 04-16-2016, 09:39 PM   #12
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When I went to the AS today, the batteries went up to 11.2 V from the solar tender. I then fired up the generator for 2 hours and checked the battery 30 mins after I turned it off. Batteries up to 12.2. I then filled up the cells with distilled water. Going back to storage tomorrow and will give the batteries another hour or so of generator time. It's stupid how the AS allows the inverter to turn on when the batteries are in store mode. You would think store mode kills the feed from the batteries to everything in the trailer but apparently not. Thanks for your input.
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Old 04-16-2016, 11:05 PM   #13
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Battery charging

Correct me if I am wrong, but I believe you must be in "use" mode for the batteries to charge from shore power. Confusing? Yes but I ran this by Airstream and they confirmed that. You would think "store" means to store power but apparently not. I ran my batteries down with shore power and store mode!
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Old 04-17-2016, 08:11 AM   #14
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Correct me if I am wrong, but I believe you must be in "use" mode for the batteries to charge from shore power. Confusing? Yes but I ran this by Airstream and they confirmed that. You would think "store" means to store power but apparently not. I ran my batteries down with shore power and store mode!
Correct, as the 'use/store' switch effectively disconnects the batteries from the fuse block and converter, with the exception of the OEM inverter and a few parasitic loads like detectors.

If the OP is using a remote battery charger, makes no difference as it would be connected directly to the batteries. If plugging in the trailer to the generator to the trailer's shore cord, then yes, 'use/store' MUST be in USE to allow the current to flow from the converter to the batteries.
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