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Old 05-17-2017, 11:31 AM   #1
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Battery percentage low when plugged to shore power

Every once in awhile my battery percentage reads less than 100% when plugged into shore power. Usually goes down to anywhere between 75-80% and stays there. Never does it on the generator or with engine running........... do I just have something set wrong or is this a future problem rearing its head. This is on a 2016 Interstate
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Old 05-17-2017, 11:33 AM   #2
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Every once in awhile my battery percentage reads less than 100% when plugged into shore power. Usually goes down to anywhere between 75-80% and stays there. Never does it on the generator or with engine running........... do I just have something set wrong or is this a future problem rearing its head. This is on a 2016 Interstate
Which battery bank is reading this, house (Aux) or chassis (Main)?
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Old 05-17-2017, 11:36 AM   #3
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It's the house battery monitor on the upper left not the battery voltage meter on the bottom right Click image for larger version

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ID:	285738. Aux is reading 12.4
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Old 05-17-2017, 11:49 AM   #4
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The upper left is the Atkinson solar controller. I would not worry about what it says. FWIW, mine seemed to like to display 85% too. I got rid of it when I upgraded my solar panel and controller. Long as the Magnum controller is taking you from bulk to absorb to float charge you should be in good shape. Battery voltage is pretty much meaningiess when being charged. You want to measure voltage when there has been no current into or out of the batteries for several hours. A good controller (which Atkinson is not), with a shunt, will keep track of battery state of charge (percentage).
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Old 05-17-2017, 11:51 AM   #5
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Cool thanks I'm probably going to change it all before we finish it for the SEMA show this year anyway.......... just wanted to make sure it wasn't a issue
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Old 05-17-2017, 02:18 PM   #6
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Aux is reading 12.4
As Titus said, the upper left is the monitor for the Atkinson solar controller and frankly I wouldn't believe it.

However, the Aux reading on the tank panel of 12.4v while plugged into shore power would concern me. That says your house batteries are only 75% charged (assuming room temp....you didn't say what the temps were), which shouldn't be the case if you're plugged in. The Magnum will float AGM Type 1 (which is how your Magnum should be set....you should confirm) at 13.1v. That's a LONG way off from where you are.

Can you confirm a few more things?

1) When plugged into shore power, what is your Magnum remote reporting? It should say Absorb, or Float, or something like that.

2) Check your Main (chassis) battery using the toggle switch on the tank level panel. What is it reading?

3) Just for grins, what is the air temp when you're checking the batteries?

That will help to determine if you have something a bit more serious going on (faulty Magnum, damaged batteries, etc).
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Old 05-17-2017, 05:41 PM   #7
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Originally Posted by FlyFishinRVr View Post
As Titus said, the upper left is the monitor for the Atkinson solar controller and frankly I wouldn't believe it.

However, the Aux reading on the tank panel of 12.4v while plugged into shore power would concern me. That says your house batteries are only 75% charged (assuming room temp....you didn't say what the temps were), which shouldn't be the case if you're plugged in. The Magnum will float AGM Type 1 (which is how your Magnum should be set....you should confirm) at 13.1v. That's a LONG way off from where you are.

Can you confirm a few more things?

1) When plugged into shore power, what is your Magnum remote reporting? It should say Absorb, or Float, or something like that.

2) Check your Main (chassis) battery using the toggle switch on the tank level panel. What is it reading?

3) Just for grins, what is the air temp when you're checking the batteries?

That will help to determine if you have something a bit more serious going on (faulty Magnum, damaged batteries, etc).
I notice mine goes into BattSave mode (12.6V) everyone once in a while. I never noticed that with my old original batteries, only after replacing them with the 2 GPL-6CT's.
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Old 05-17-2017, 05:52 PM   #8
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I notice mine goes into BattSave mode (12.6V) everyone once in a while. I never noticed that with my old original batteries, only after replacing them with the 2 GPL-6CT's.
From the Magnum manual:

Full Charge (Battery Saverô mode): The fourth stage occurs after four hours of float charging. The Full Charge stage maintains the batteries without overcharging, preventing excessive loss of water in flooded batteries or drying out of GEL/AGM batteries. In this stage, the charger is turned off and begins monitoring the battery voltage. If the battery voltage drops low (≤12.7 VDC), the charger will automatically initiate another four hours in float charge.

Given this, I think what yours is doing is fine, but I think the OP still may have an issue because his house batteries are going down to 12.4v......
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Old 05-18-2017, 07:56 PM   #9
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As Titus said, the upper left is the monitor for the Atkinson solar controller and frankly I wouldn't believe it.

However, the Aux reading on the tank panel of 12.4v while plugged into shore power would concern me. That says your house batteries are only 75% charged (assuming room temp....you didn't say what the temps were), which shouldn't be the case if you're plugged in. The Magnum will float AGM Type 1 (which is how your Magnum should be set....you should confirm) at 13.1v. That's a LONG way off from where you are.

Can you confirm a few more things?

1) When plugged into shore power, what is your Magnum remote reporting? It should say Absorb, or Float, or something like that.

2) Check your Main (chassis) battery using the toggle switch on the tank level panel. What is it reading?

3) Just for grins, what is the air temp when you're checking the batteries?

That will help to determine if you have something a bit more serious going on (faulty Magnum, damaged batteries, etc).


I'm just replying to this I was driving from Pa to Nashville since last night.

1. When I just plugged into the campground it says absorb 14.9v 70a

2. When I checked it the day I posted this it was 12.46

3. It was probably 80 outside when I got this reading and it had been plugged in several hours
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Old 05-19-2017, 07:07 AM   #10
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Battery percentage low when plugged to shore power

Ok woke up this am after hooked to shore power at KOA Nashville all night and my aux battery says 12.11. The magnum readout says float 12.3v 0A.
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Old 05-19-2017, 07:36 AM   #11
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Went out and flipped the breaker off and back on and now it says Bulk 13.3v 53a
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Old 05-19-2017, 10:05 AM   #12
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I had a similar problem; turned out to be a loose cable connection on the battery. I recommend disconnecting the connections at the battery, cleaning, then attaching. Hope this helps!
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Old 05-19-2017, 11:02 AM   #13
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Ok woke up this am after hooked to shore power at KOA Nashville all night and my aux battery says 12.11. The magnum readout says float 12.3v 0A.
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Went out and flipped the breaker off and back on and now it says Bulk 13.3v 53a
Those values all look wrong. The Magnum should Float at 13.1v for AGM Type 1's which is what the Lifeline's are, and it should Bulk charge over 14v. You're nearly a full volt below both of those numbers. You should double check that your Magnum is set up correctly via the remote. Battery type should be AGM 1. If it is set correctly, I suggest resetting it (hold the power button down that's on the top of the Magnum for 15 seconds until the LED starts to flash rapidly, then release) and see if that gives it a kick in the brain. If it's still Floating your batteries at 12.3v after that, take it in and have it looked at.
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Old 05-19-2017, 12:09 PM   #14
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Use the attached PDF for your Magnum settings obtained from Airstream.
Lew has recommended these modifications to the settings:
Charge Rate change to 100%
LBCO (low battery cut off) change to 11VDC.
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File Type: pdf Magnum settings .pdf (309.1 KB, 39 views)
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