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Old 10-09-2013, 02:32 PM   #1
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Thanks re: battery life

I want to thank everyone who has contributed to the various posts regarding battery discharge rates. In my case, with my 2014 AI Twin, the culprit was the antenna booster. My batteries are now holding just fine while parked under my carport. The one thing I don't understand (and perhaps a knowlegable member can enlighten me) why, when plugged into 110, do the batteries charge to 100% in the bulk and absorbtion stages then drop to 90% in the float stage? Is it advisable to try to catch it at or near 100% and unplug?
Thanks in advance.
Bill
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Old 10-10-2013, 09:30 AM   #2
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Bill, where are you getting the SOC % readings? And which inverter/charger do you have in your Interstate?
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Old 10-10-2013, 12:36 PM   #3
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I have the Magnum 1000w invertor/charger and the SOC reading is off the solar charge indicator. I noticed it read 100% during absorbtion stage then dropped to 90% during float stage. This is what the manual said it was supposed to do but I don't understand why.
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Old 10-10-2013, 01:44 PM   #4
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Hello Bill, I was new to all of this 6 months ago - but I'm learning fast....
If you refer to the Lifeline Technical Manual - which you can download from the Lifeline website - you can see that Lifeline endorses this method of charging their batteries. But you will read that the voltage rates are all dependent on the ambient temperature. Float is supposed to maintain a 100% charge - but with a reduced voltage.
I suspect you may have to adjust your Magnum settings to take the ambient temperature into account.
Peter
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Old 10-10-2013, 02:01 PM   #5
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Hello Bill, I was new to all of this 6 months ago - but I'm learning fast....
If you refer to the Lifeline Technical Manual - which you can download from the Lifeline website - you can see that Lifeline endorses this method of charging their batteries. But you will read that the voltage rates are all dependent on the ambient temperature. Float is supposed to maintain a 100% charge - but with a reduced voltage.
I suspect you may have to adjust your Magnum settings to take the ambient temperature into account.
Peter
All Magnum inverter/chargers come with a temperature sensor that is connected to a negative battery terminal. This is plugged it to the network port on the Magnum, which then will automatically compensate the charging voltage according to the ambient battery temps read by the sensor.

No other adjustments are required, so long as you have programmed the remote with the proper battery type.
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Old 10-10-2013, 04:13 PM   #6
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Thanks lewster and ukdude, your feedback is much appreciated.
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Old 10-10-2013, 06:54 PM   #7
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Magnum inverter/chargers

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All Magnum inverter/chargers come with a temperature sensor that is connected to a negative battery terminal. This is plugged it to the network port on the Magnum, which then will automatically compensate the charging voltage according to the ambient battery temps read by the sensor.

No other adjustments are required, so long as you have programmed the remote with the proper battery type.
But on my unit Airstream did not install the temp sensor for the Magnum inverter/charger. Guess I'll have to install one myself if I want the Magnum to work properly.
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Old 10-10-2013, 07:50 PM   #8
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Thanks Mike - thought I was going crazy looking for it on my unit!
Peter
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Old 10-10-2013, 08:24 PM   #9
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Haven't checked mine yet but I will do so tomorrow. It would be a shame if Airstream simply didn't bother installing the temp sensor as they are supplied with the invertor/chargers. If anyone gets any info on ordering this part from Magnum, please share it on this thread.
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Old 10-11-2013, 11:12 AM   #10
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Just checked my batteries and didn't see anything extra connected to the (-) terminals. Checked the invertor/charger and there is a line connected to the temp sensor terminal with the lead running toward the battery box. I assume the temp sensor lead is connected to a neg cable somewhere besides the battery terminals. Was very impressed with how the batteries were installed in a sealed, vented steel box and very neatly cabled. The quaility on these coaches is amazing.
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Old 10-11-2013, 11:45 AM   #11
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Is there an easy way to test the AGM batteries to see how much life they have left in them?
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Old 10-11-2013, 03:24 PM   #12
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I was mistaken about something being connected to my temp sensor input on the Magnum, it was actually the line to the remote control. There is nothing connected to the temp sensor input. I emailed Airstream tech support and they told me it was an option with the Magnums and they didn't use them. I then called Magnum tech support and was told they ship a temp sensor with every invertor they sell and although is is not mandatory to use it, they recommend installing it. They won't sell direct to the public so I called one of their dealers who quoted $32 + $20 shipping. I have emailed back to airstream and asked them to send me one of the hundreds they must have laying around. I'll report what I hear back.
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Old 10-11-2013, 06:19 PM   #13
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Haven't heard back from Airstream but one issue that comes to mind: the batteries are contained in a sealed box. Need to somehow penetrate the box with the temp sensor lead so the box can remain sealed. This may be the reason that Airstream didn't use the temp sensors. Any ideas?
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Old 10-11-2013, 06:27 PM   #14
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I had a similar question on the forum a little while back - I wanted to connect up a trickle charger...
http://www.airforums.com/forums/f240...ox-110495.html
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