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Old 10-29-2015, 04:11 PM   #1
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Upgraded batteries

I just had my coach batteries upgraded to Lifeline GPL-6CT for my 2015 Interstate Grand Tour. Did have to have new cages built and that was expensive, but hopefully I will have enough power now to get me through the night running the fridge and freezer.

I do have a question. I want to make sure that I don't ruin these so is it okay to leave coach plugged in all the time when the unit is in the garage or should I disconnect? Still has the standard Magnum inverter.

Thanks
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Old 10-29-2015, 05:13 PM   #2
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I do have a question. I want to make sure that I don't ruin these so is it okay to leave coach plugged in all the time when the unit is in the garage or should I disconnect? Still has the standard Magnum inverter.
You may want to add the temperature sensor that Airstream didn't install just to be sure, but with a Magnum inverter/charger it is usually okay to keep it plugged in all the time while the van is in storage, especially if the garage in question is temperature-controlled.
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Old 10-29-2015, 05:55 PM   #3
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Protag,

Believe it or not, I'm working on a new Grand Tour and I actually found a Magnum temp sensor on the outside batteries!!!!!!! Hallelulia!!!!

Of course, it was placed on the wrong battery terminal but hey.......it's a start.

Adding a 300 amp/hour lithium among with 400 watts of solar, Magnum 2000 watt inverter/charger and other 'goodies'. :-))


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Old 10-29-2015, 06:00 PM   #4
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Dalwyn,

Did the tech reset your battery capacity on the Magnum remote? It should show 300 amp/hours, as this determines the duration of the absorb phase.

You can leave it plugged as long as you like with the temp sensor in place. BTW, it should be connected to the negative terminal of the series cable.


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Old 10-29-2015, 06:22 PM   #5
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Dalwyn,

Did the tech reset your battery capacity on the Magnum remote? It should show 300 amp/hours, as this determines the duration of the absorb phase.
Lew,
No, I don't believe he did. When I check the settings 200amh/hours is selected <-. Scrolling through the menu, I have options for 400 and 800, no 300. Should I contact them to have them reset something? Or should I set it to 400?

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Old 10-29-2015, 06:46 PM   #6
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with a Magnum inverter/charger it is usually okay to keep it plugged in all the time while the van is in storage, especially if the garage in question is temperature-controlled.
Protagonist - The garage is not temperature controlled, just a brick garage without inside insulation.

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Old 10-29-2015, 07:14 PM   #7
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I keep my 2015 AI plugged into 30amp circuit all the time when not in use. First I've heard of a temperature sensor. Should I not be leaving it plugged in?

Barn is insulated but not climate controlled.

Mark


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Old 10-29-2015, 09:01 PM   #8
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The process by which batteries make electricity is driven by chemical reactions. Like most chemical reactions, they slow down in colder temperatures. Even when fully charged, your AGM house batteries will only have about 80% of the amp-hours at 32F as they do at 70F.

Unless your charger is equipped with temperature compensation, it's entirely possible for your batteries to be over-charged in colder temperatures.

So unless your charger has temperature compensation and a temperature sensor, OR your Airstream is stored where the temperature will remain above about 60F, it might be best not to leave it plugged into shore power all the time in winter storage.
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Old 10-29-2015, 09:46 PM   #9
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Actually, the temperature compensation curve is an inverse relationship between charging voltage and battery temp. Lifelines need more voltage at lower ambient temps and less at higher temps.

Without the BTS (battery temp sensor) connected to a negative battery terminal, the Magnum charger assumes the ambient temp to be 77 deg. F.

The problem with setting the correct amp/hour size rests with the Magnum remote. I ALWAYS upgrade the basic ME-MR that Airstream provides to the ME-RC, which is a much better platform for controlling the inverter/charger.

Aside from requiring a larger mounting hole, it uses the exact same cable as the ME-MR.

I have never encountered a problem such as not having the correct amp/hour setting available. I would contact Magnum tech support tomorrow to get a definitive answer. They are in Everette, WA.


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Old 10-29-2015, 10:07 PM   #10
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Actually, the temperature compensation curve is an inverse relationship between charging voltage and battery temp.
Thank you for the correction. I was half-right, which is only fair because I'm sometimes a half-wit. Batteries do drop to a lower charge state as temperature drops, so it takes more charging current to bring them back up to where they're supposed to be. Duh!
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Old 10-30-2015, 11:16 AM   #11
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Thanks Lewster and Protagonist for your input. I called Magnum this morning and the tech support said to set the ME-MR remote to 400 amp/hrs. That is their default setting so I hope that is correct. I am going to be upgrading to the ME-ARC in January to get the auto start gen and that should give me more control over the settings. I also believe the service tech that installed the batteries did hook up the battery sensor correctly. If what I am looking at underneath is the sensor it is hooked to the same terminals as the black wires.

To clarify in my little mind, I will be ok in leaving the unit plugged in when store in the garage this winter. I live in the Memphis TN area and we do have some cold weather in January and February. I just don't want to do anything to ruin these batteries.
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Old 10-30-2015, 12:15 PM   #12
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No worries about leaving the rig plugged in for the winter. The Magnum will nicely coddle your batteries.

You don't really need the ME-ARC to run the auto gen start. The ME -RC works quite well. You will need the ME-AGS-N as the interface between the generator, the inverter and the remote.


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Old 10-30-2015, 01:23 PM   #13
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You don't really need the ME-ARC to run the auto gen start. The ME -RC works quite well. You will need the ME-AGS-N as the interface between the generator, the inverter and the remote.
Thanks Lew, that is what I will get.
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Old 10-30-2015, 01:38 PM   #14
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I installed a set of GPL-4CT's (2 x 220AH 6V) this summer. It would take forever on shore power or generator to get the charge much over 90 some percent.

Absorb time on ME-MR remote is just a bit short with the 200 setting. So stretching the absorb by stepping up to 400 seems to work better and no need to run the generator all day long to float charge, getting close to a 100% charge (per trimetric monitor)

I suppose on of these days I spend the extra bucks for an ME-ARC to get a little closer to what it should be.
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