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Old 10-26-2015, 07:36 AM   #1
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Winter Storage MBS chassis battery

FR recommends not to use the onboard converter/charger to "maintain" the coach batteries during storage. They suggest disconnecting by removing the +ive terminal (too many things causing a discharge and thereby causing discharge cycles) and either bring indoors and float charge or leave in coach and float charge.

I am wondering what you MBS owners do with your chassis battery during storage? I was thinking of disconnecting the ground, and putting a charge on the battery. We will only need to worry about storage for 2 months since we are using the MH in Jan.

Always appreciate everyone's opinions
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Old 10-26-2015, 08:26 AM   #2
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Old 10-26-2015, 09:11 AM   #3
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Procedure time tested three years running on the OE bats in Solera. Charge bats to full, check water levels, turn coach main connect off, remove the step cover, fish your supply power cord either through your hood vent or bat compartment vent hole, hook up trickle charger to one bat pos/neg. There is sufficient voltage on trickle to maintain all three batteries for the winter storage period, assuming all are in good working order and full charged. They are connected through the battery manager in the lower left stairwell. Longest duration tested with this procedure, four months.
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Old 10-26-2015, 05:53 PM   #4
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Still Kickin - Curious about your charger on the house battery charging the chassis battery.My dealers explanation is that the connection between the chassis battery and house battery as a one way connection - the chassis will charge the house batteries but the house batteries will not discharge/charge the chassis battery. If that is the case would a charger on the chassis battery charge the house battery?? I was also told to use a float charger rather than a trickle charger.
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Old 10-26-2015, 07:38 PM   #5
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Quote:
Originally Posted by SSmbs View Post
Still Kickin - Curious about your charger on the house battery charging the chassis battery.My dealers explanation is that the connection between the chassis battery and house battery as a one way connection - the chassis will charge the house batteries but the house batteries will not discharge/charge the chassis battery. If that is the case would a charger on the chassis battery charge the house battery?? I was also told to use a float charger rather than a trickle charger.
I'm interested in this answer also, as I assumed there might be a one-way diode between the chassis battery and the house batteries as you state. i'm using two Battery Minder brand 4-stage float units. One I have hooked to the MBS chassis battery and the other to the two house batteries on the Forester MBS. This has worked well so far.
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Old 10-26-2015, 09:50 PM   #6
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My understanding of the terms; Trickle charging means charging a fully charged battery under no-load at a rate equal to its self-discharge rate, thus enabling the battery to remain at its fully charged level. [1][2] A battery under continuous float voltage charging is said to be under float-charging. Upon further review I employ a float charger.

Now, as to if the battery manager is: one or two way, I'd ask others to chime in, (i.e. FR EE's) on the statement made by one poster it might be one way. I can tell you that it has worked for me, three winter storage seasons. Last winter was a doozie, in the eastern US and I came away unscathed. I vote it's two way. But, i'm sure others will have specific knowledge to comment on that.

I have read from B Clemens in the past, that MB will not allow FR to tie into the house batteries as a jumping circuit, in the event the chassis bat crapped out to start the engine. But that is an entirely different issue.
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Old 10-27-2015, 09:46 AM   #7
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I put in a disconnect in the battery compartment to remove the house batteries from ground. When I put in storage, I disconnect the ground, then I pull the Mercedes coach disconnect.

I've done this for 3 years now, goes in storage in October, comes out in April. Follow the Mercedes reconnect procedure and it has started every time.
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Old 10-27-2015, 04:33 PM   #8
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NO charging should be necessary at all for at least 3 months IF you fully 100% charge the batts before storing and remove one of the terminal wires...either positive or negative. Cold weather loss of charge should not be even 10% a month for a fully charged and disconnected battery and they will not freeze even at -20 below if the charge level is above 60% (voltage 12.3).
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Old 10-28-2015, 11:06 AM   #9
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I have a Battery Tender lead attached to the chassis battery.
Will this also charge the coach batteries if the battery switch is in the "off" position?
Seems to be conflicting answers to this.
I have the advantage of also plugging in the coach as I store it on the side of my house but the trickle charger to the chassis is easy.
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Old 10-28-2015, 11:33 AM   #10
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Good question.. Seems like we all have questions.. you could check the voltage the charger is putting on the chassis batteries and see what the reading is on the coach batteries to see if charging
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