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Old 09-29-2014, 04:39 PM   #11
2012 Solera 24S
 
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Location: NW Illinois
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I stored my 2012 24S from October to April with the chassis battery disconnect removed. When I reconnected it started right up.

I also installed a secondary disconnect between the battery and ground for storage use. There are parasitic loads (CO/LP detector is one) when the house disconnect is off. When this is disconnected there is no way to drain the house batteries since there is no ground path back to the batteries.

Maybe bclemens can confirm but I didn't think MB allowed interconnects between the chassis and house batteries. The alternator does charge the house batteries when the engine is running but I'm not sure what would happen if you were connected to shore power and the engine was running.
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Old 09-30-2014, 11:46 AM   #12
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Correct...its my understanding that we can't feed back into the Mercedes system. So no emergency start switch because that connects all the batteries together which they says is not allowed.

I'll double check that with engineering.
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Old 09-30-2014, 02:20 PM   #13
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Engineering confirmed no emergency start switch. However the battery isolation manager does charge the Sprinter chassis battery. So the generator and shore power would handle that if plugged in. Disconnect would need to be in the ON position for most models. We started wiring that charge line directly to the batteries earlier this year.
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Old 09-30-2014, 03:41 PM   #14
2012 Solera
 
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Chassis Battery Discharge

Quote:
Originally Posted by beaveratc View Post
We have a new solera 24s. We stored it for 4 weeks and the house and chassis batteries are dead. I used the shutoff for the house but did not use the one for the chassis under the dash near the gas pedal. Short of a tow truck, i cant find any way to jump-start the coach. Here are my 2 questions: 1) does the under the dash battery cut off work well and how long will chassis battery last if this is used and 2) is there any way, short of a tow truck, to jump-start the coach. Thanks

Not sure what is going on, but on my 2012 Solera "S" I have regularly left the motorhome for well over a month (more like 2+ months) without turning off the chassis battery disconnect and did not experience a battery discharge problem. I do turn off the house disconnect switch in the stair well. The house batteries have also not discharged significantly over the same period. The house battery disconnect switch on my unit disconnects the LP/CO detector.

Our 2012 has the Lippert "flush floor" slide; don't know if FR has changed that for the newer "S" models. I understand the Schwintech (sp?) slides have a "brain" which does draw some current while the disconnect switch is off. I also understand the new units have a different radio - no idea if that adds to the parasitic draw. I have not experienced significant parasitic draw from either the original Magnadyne radio or the Kenwood I replaced it with. There may be other changes since my unit that add parasitics when the house disconnect is turned "off".

If, as you state, your chassis battery is discharging in a month, I suspect a problem - e.g. under hood light staying on? Courtesy light staying on? With respect to the house batteries discharging so quickly with the disconnect turned off, I would suggest measuring the draw (with the disconnect switch turned off) and try to isolate the source. What you experienced sounds like excessive drain somewhere.
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Old 09-30-2014, 06:32 PM   #15
2012 Solera
 
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Another thought on the chassis battery discharge - our 2012 Solera has two twelve volt (cigarette lighter type) outlets in the cab/dash area - one in the "ash tray" and one below that. The one in the ash tray is turned off by the ignition, however the lower one is not. If you have anything plugged into the lower "cigarette lighter" adapter, it may be a source of a parasitic which could drain your chassis battery. A phone or iPad charger - even with the device disconnected - may have some current draw. Even a 100ma draw over a four week period would consume about 70 amp-hours!
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Old 10-01-2014, 09:22 AM   #16
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Quote:
Originally Posted by JLeising View Post
Another thought on the chassis battery discharge - our 2012 Solera has two twelve volt (cigarette lighter type) outlets in the cab/dash area - one in the "ash tray" and one below that. The one in the ash tray is turned off by the ignition, however the lower one is not. If you have anything plugged into the lower "cigarette lighter" adapter, it may be a source of a parasitic which could drain your chassis battery. A phone or iPad charger - even with the device disconnected - may have some current draw. Even a 100ma draw over a four week period would consume about 70 amp-hours!
Thanks for you input-The lower "cigarette lighter" adapter looks like a good place to plug in a Solar Panel to get some juice back into your Solera battery while in storage, etc.
Respectfully,
CaptDan
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Old 10-01-2014, 11:29 AM   #17
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Just as a secondary thought...if you want to be SURE there is no parasitic drain...simply mount one of these on your negative battery terminal. About $5-7 bucks.


Of course...you have to remember to turn it on for charging and starting!
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