Community Forums

mnmountains · 12-10-2021, 06:03 AM

2016 DS 4369

Long story, but I will keep it short. I replaced my house batteries (8) with AGM's. Took a two week trip, with no issues. Put it back into storage where we have 30 amp. I went out to check on things, and all of the batteries were completely dead, including chassis batteries. The Magnum system showed a red fault.

I put a charger on the chassis batteries over night. It started right up. The Magnum system reset and started charging. Because the chassis batteries were original, I had them replaced.

Everything seems to be operating correctly now.

Two questions:

1. Would bad chassis batteries cause the Magnum system to go into fault?

2. Going through the settings, there appears to be one setting that is set to max charge 80%. Is this correct?

Thanks for any help.

Ken

**pasdad1** · 12-10-2021, 06:24 AM

Didn’t the Magnum indicate what the fault was? Mine faulted once, but on the display it said it was from overheating. It had been on bulk charge putting out 110 amps for awhile when it happened. I opened the basement doors to let the hot air out, and it reset in a few minutes.

mnmountains · 12-10-2021, 07:38 AM

Quote:

Originally Posted by pasdad1

Didn’t the Magnum indicate what the fault was? Mine faulted once, but on the display it said it was from overheating. It had been on bulk charge putting out 110 amps for awhile when it happened. I opened the basement doors to let the hot air out, and it reset in a few minutes.

Showed Dead Battery Cutout.

But why would it not continue to charge the house batteries? They were brand new and taken down to 2 volts. I probably lost years of life on them now.

Ken

AlanTerry · 12-10-2021, 07:53 AM

Call
For Magnum Energy products:
Sensata Technologies 2211 West Casino Rd. Everett, WA 98204
Statement of Appreciation
Phone: 425-353-8833
Fax: 425-353-8390
Web: www.SensataPower.com

They walked me thru programming mine for Lifeline AGM batteries when I replaced my Trojan Batteries.

**pasdad1** · 12-10-2021, 08:17 AM

Quote:

Originally Posted by mnmountains

Showed Dead Battery Cutout.

But why would it not continue to charge the house batteries? They were brand new and taken down to 2 volts. I probably lost years of life on them now.

Ken

Just a thought…. I’m thinking the fault was from the inverter cutting off due to low battery. I think you inadvertently turned off the charger….it’s easy to do…. Just touching the charger button too long turns it off.

Persistent · 12-10-2021, 08:33 AM

I am not sure which Magnum inverter/charger you have. There are 13 models on this page:
https://www.magnum-dimensions.com/mo...erter-chargers

What is the model identifier?

rffowler55 · 12-10-2021, 09:11 AM

Quote:

Originally Posted by Persistent

I am not sure which Magnum inverter/charger you have. There are 13 models on this page:
https://www.magnum-dimensions.com/mo...erter-chargers

What is the model identifier?

As Persistent states, not knowing which Magnum product you have we are not fully able to provide insight. Not every Magnum inverter has a built-in charger. The Magnum inverter in my coach does not have a charger but the one that my solar power system at home uses does. If your unit has the charger function go to your setting screen and determine where you have the setting for the low battery cutoff to insure it is not set to high and looking at the charging settings to see what voltage you have the charging to start. It is possible with the new batteries you may need the charging to start at a higher voltage range than the previous batteries.

Your current battery manufacturer should have a state of charge chart that corresponds to a voltage reading that can assist you in determining that setting. For example, if your low battery cutoff is set at a voltage close to the charge starting voltage you may encounter a low battery fault since the charger may not react quick enough to prevent the fault.

As to the 80% charge rate, that is the default Magnum setting and should not have a correlation to your issue. The charging rate being to high for your particular battery bank can result in increased battery temperature which is also in direct relation to the maximum amps you allow the charger to access during the charge cycle.

If your inverter does not have a charger then you potentially have a converter issue. The inverter, even without charger capabilities, still monitors the batteries state of charge and wii generate a fault if the voltage drops below the LBCO low battery cutoff point.

As for the chassis battery issue, I would be surprised if your system has the interface capabilities to generate an inverter fault when the chassis batteries are low since most inverters only monitor the house battery bank batteries for LBCO purposes, but, without knowing your coach’s level of sophistication that is not outside the scope of possibilities.

757driver · 12-10-2021, 10:31 AM

Quote:

Originally Posted by mnmountains

2016 DS 4369

Long story, but I will keep it short. I replaced my house batteries (8) with AGM's. Took a two week trip, with no issues. Put it back into storage where we have 30 amp. I went out to check on things, and all of the batteries were completely dead, including chassis batteries. The Magnum system showed a red fault.

I put a charger on the chassis batteries over night. It started right up. The Magnum system reset and started charging. Because the chassis batteries were original, I had them replaced.

Everything seems to be operating correctly now.

Two questions:

1. Would bad chassis batteries cause the Magnum system to go into fault?

2. Going through the settings, there appears to be one setting that is set to max charge 80%. Is this correct?

Thanks for any help.

Ken

Ken,

I doubt bad chassis batteries caused the fault with your Magnum charger.

The max charge of 80% may or may not be correct, it depends on what AGM batteries you have.

My guess is for what ever reason you lost power to the plug that the RV was plugged into for an extended period of time. The house batteries depleted with what ever is running inside from the inverter circuits. The chassis batteries depleted from parasitic draw and overall age.

If you would like send me a PM with your inverter model and year, house battery make model and I can set you up with proper settings for your house batteries.

Dutch Star Don · 12-10-2021, 11:19 AM

I'm not as electronically smart as 757 Driver, but the first thing that came to mind as I read the post was a power outage at the storage facility. Are you storing at your house or at a paid facility. It would only take 2-3 days for the batteries to drain. Once the Magnum shuts down, it won't restart when the power the comes back on.

If that's the case, you can set your generator to Auto Start to save the batteries or find a device that lets you look at the RV, like an in home camera. Unfortunately, you need internet for that to work.

mnmountains · 12-10-2021, 01:37 PM

Quote:

Originally Posted by 757driver

Ken,

I doubt bad chassis batteries caused the fault with your Magnum charger.

The max charge of 80% may or may not be correct, it depends on what AGM batteries you have.

My guess is for what ever reason you lost power to the plug that the RV was plugged into for an extended period of time. The house batteries depleted with what ever is running inside from the inverter circuits. The chassis batteries depleted from parasitic draw and overall age.

If you would like send me a PM with your inverter model and year, house battery make model and I can set you up with proper settings for your house batteries.

Thanks. PM Sent. To everyone else: Thanks for the replies. So far, the system seems to be functioning properly.

Ken