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Old 12-17-2014, 05:21 PM   #29
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Originally Posted by lewster View Post
No apologies required!!!!

Your generator run time will depend on the amperage output of your charger and the state of discharge of your batteries. If you have the Magnum MMS-1012, it has a 50 amp charging section, which has an adjustable output.

The next variable is the size of your battery bank. Typically, Lifeline AGM batteries use the C/5 rule. That takes the Capacity of your batteries and divides by 5.

If you have the standard 180 hour Lifeline bank, then your preferred charger output is 180/5 or 36 amps. The closest you can set the Magnum is 40 amps or an 80% charge rate.

Next, determine your state of charge level. This is easily done by reading the resting voltage of your batteries. Let's say that they read 12.2 VDC, which is 50% for Lifelines, so at that level you will need to replace 80 amp/ hours into your batteries. At the charge rate of 40 amps from above, you would need to run the generator about 2 hours to fully re-charge your batteries.

Exceeding the run time is no problem as the Magnum will go to a 13.2 VDC float charge when they are full. It is far worse to undercharge them by not completing the charge cycle.

Questions?

Class dismissed! :-))


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Lew, having installed ME-RC, I'm trying to make sure I have the settings correct for 2014 AI.
01-Search Watts-5W
02-LBCO-10.0VDC
03-Absorb Hrs-1.0
04-Bat Type-AGM 1
05-charge rate-80%
06-VAC dropout-80VAC
07-PWR Save-5min
08-screen contrast-90%brightness50%
09-Final Charge-Multi
10-Pwr Up Always-No

You comments are always appreciated.
Adding ME-RC was very straightforward. Hard to understand why that remote isn't standard issue.
Bruce T.


2014 Airstream Interstate
Currently a "Weekender" but planning a cross country trip next summer.
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Old 12-17-2014, 06:13 PM   #30
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Bruce, see my comments in red below:

I need to know what your battery bank size is. Is it the standard 80 amp/hour X 2? If so, you have a total of 160 amp/hours and at the C/5 rate, you need 32 amps of charging, and the closest setting on the Magnum for your size charging section is 70% (50 amps X 70% =35 amps).

Quote:
Originally Posted by Brucet45410 View Post
Lew, having installed ME-RC, I'm trying to make sure I have the settings correct for 2014 AI.
01-Search Watts-5W
02-LBCO-10.0VDC
03-Absorb Hrs-1.0
04-Bat Type-AGM 1
05-charge rate-80% 70%
06-VAC dropout-80VAC
07-PWR Save-5min I usually set this to 1 minute
08-screen contrast-90%brightness50% 100% for both
09-Final Charge-Multi
10-Pwr Up Always-No

You comments are always appreciated.
Adding ME-RC was very straightforward. Hard to understand why that remote isn't standard issue.
Bruce T.

EVERYTHING ELSE LOOKS GOOD!!

2014 Airstream Interstate
Currently a "Weekender" but planning a cross country trip next summer.
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Old 12-17-2014, 07:14 PM   #31
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Lew, Super response as always. I'll make the changes you suggest. I plan on getting back with you for Feb modifications as discussed in previous PMs.
BruceT.


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Old 12-26-2014, 03:18 PM   #32
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Our 2014 is dead today too. Hooked it up to shore power and still noting is working (except the microwave!?) we called the dealer, since we hadn't touched it since we got it back from them before the holidays, but they were not able to help. The key won't turn in the ignition. Any suggestions? The whole power system is still so confusing to me!

Thank you!


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Old 12-26-2014, 04:35 PM   #33
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Our 2014 is dead today too. Hooked it up to shore power and still noting is working (except the microwave!?) we called the dealer, since we hadn't touched it since we got it back from them before the holidays, but they were not able to help. The key won't turn in the ignition. Any suggestions? The whole power system is still so confusing to me!

Thank you!


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The dealer is a miserable so-and-so and should be offering you some help - even over the phone. Are they a Mercedes Benz dealer or just an RV dealer?

If you cannot turn the ignition key, then clearly the chassis battery is dead; have you confirmed that by trying the headlights, etc?

If you leave it hooked up to shore power, then the chassis battery will eventually be charged enough to turn the key and start the engine.

But the mystery remains as to why the chassis battery was drained. It's my understanding the Interstate has an Isolation Manager that should prevent the chassis battery from being accidentally discharged from the coach side..... unless something has been drawing power directly from the chassis battery over the holiday. Do you have an alarm fitted, for example?
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Old 12-26-2014, 06:02 PM   #34
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Quote:
Originally Posted by Semmons View Post
Our 2014 is dead today too. Hooked it up to shore power and still noting is working (except the microwave!?) we called the dealer, since we hadn't touched it since we got it back from them before the holidays, but they were not able to help. The key won't turn in the ignition. Any suggestions? The whole power system is still so confusing to me!
The simple solution to get you back on the road is a jump start. If you hook up the jumper cables and leave them hooked up for a couple of minutes before you insert the key in the ignition, you should be able to turn the key.

I've had to do that a couple of times; turns out my original battery was defective, with a dead cell— replaced by Mercedes Benz at no cost to me and no problems ever since.
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Old 12-26-2014, 06:45 PM   #35
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The chassis battery disconnect didn't get accidentally disconnected did it?
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Old 12-26-2014, 11:32 PM   #36
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The dealer was able to help and it is charging! Now we need to figure out why it drained completely. Thanks for the feedback, as always, this group is the best!


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Old 12-27-2014, 08:59 AM   #37
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If you would like some help in troubleshooting your problem we need some more details. How long was your Interstate sitting unused and not plugged in? Where you getting sunshine on the solar panel?


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Old 01-16-2015, 08:54 PM   #38
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I'm glad you understand it. I've read and read again many posts here on battery charging and have NO idea what any of it means. Nothing is sinking in.
What I need is for someone to tell me, step by step:
1 - push this button
2 - turn that switch
3 - jump up and down three times
I KNOW that sounds silly to you all who understand. I feel like I'm reading another language and it's Latin!
If anyone can write step by step how to avoid depleting the house battery.....I'll give you my first born who is now 33.
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Old 01-21-2015, 04:57 PM   #39
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I have mine 2013 now for 2 weeks or so not used but hocked up on shore power my house battery is up to 13.7V my coach battery is down to 12.7V. I exercised the generator and the coach battery came up 13.6V during the 1/2 hour run of the generator.
Should the magnum charge also the coach battery? Or is this normal?
Thanks
Peter
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Old 02-10-2015, 05:05 PM   #40
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Another question- Just to confirm when storing the 2014.5 AI for a month or two at a time it is fine to leave it hooked up to shore power (in this case a 20 amp circuit) the whole time? Also if I do should the magnum inverter be set to on?? (green light on)? Thanks again everyone
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Old 02-10-2015, 05:12 PM   #41
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All the latest models use the Magnum charger/inverter and you can leave that plugged in indefinitely. Leave the inverter off; by plugging into shore power you already have power to the coach.
Scottsdale, eh? You're almost a neighbor! Did you buy it from Joe at Shumacher?
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Old 02-10-2015, 05:29 PM   #42
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All the latest models use the Magnum charger/inverter and you can leave that plugged in indefinitely. Leave the inverter off; by plugging into shore power you already have power to the coach.
Scottsdale, eh? You're almost a neighbor! Did you buy it from Joe at Shumacher?
Thanks UK DUDE- We bought our previous 2012 AI from Joe (great guy). When we upgraded to the 2014.5 we bought from Orange County. As much as I would have liked to buy from Joe they couldn't come close on price.

Appreciate your help- the electrical system drives me nuts. Also we stored the AI for about 3 months in covered storage with no power or sunlight - I am worried we let batteries get too low so I am going to see how long they last after being fully charged. Any tips?
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