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Old 10-29-2015, 09:49 AM   #21
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Originally Posted by Still Kickin View Post
My question then would be; if that is the case, then does the BCC control current allow flow of current in both directions, as needed without the engine (alternator) entering this equation.

only the alternator will charge the coach batteries, never the engine battery
( unless you try to connect them with jump start cables )

on the 2006 5-cyl Sprinter Vista Mini I traded last Oct for the 24S. a less sophisticated system only charged the coach batteries with engine running, when my engine battery once ran down ( my mistake ) I had to use jump start cables from the coach batteries to get started.

On this 2014 Solera, running the propane generator will recharge the engine battery if you are away from shore power.

by the way, those batteries all lasted for the 8 year, 74000 mile run I had out of that vehicle, nor did it ever use any oil between it's yearly services
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Old 10-29-2015, 09:56 AM   #22
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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.
Great question,,, I hope someone has the answer !!!
I have looked @ the house batteries in our Sunseeker,,,
I do not see a way to check fluid level !!!
Could they be Maintenance Free Batteries ???
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Old 10-29-2015, 02:00 PM   #23
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Great question,,, I hope someone has the answer !!!
I have looked @ the house batteries in our Sunseeker,,,
I do not see a way to check fluid level !!!
Could they be Maintenance Free Batteries ???
They could be. Some people look for individual caps when determining if maintenance free. My batteries have a rectangular block of plastic perhaps 3x 5 inches and it covers 3 cells.
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Old 10-29-2015, 02:41 PM   #24
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I performed a couple of investigative tests today. I am plugged into shore power and made a mental note of the read out on my Progressive Industries EMS-HW30C remote which was indicating a 1A draw. I turned on the headlights and the read out changed to 7A. This appears to indicate that the chassis is receiving current from the shore power.

Subsequently I connected my multi-meter to the "jump" leads under the hood while I was connected to shore power and the voltage read out was 13.19v. I then disconnected the shore power and repeated the test and the voltage read out was 12.8v.

My conclusion is that it does seem true that the shore power connection will indeed provide current to the chassis battery. So it appears that leaving the MH plugged into shore power will maintain both the coach batteries and the chassis battery. Therefore it seems this just leaves the argument as to whether it is better to disconnect battery leads and let the batteries sit over winter, or rather leave it all plugged in to maintain the batteries and periodically check water levels.

I do intend to check water levels and periodically exercise the generator and in my case the MH is stored in a garage that is heated to 45F read by a thermostat at eye level by a gas furnace that is 7'8' above the height of the MH, so arguably the ambient temperature is likely closer to 50F in the garage. This is required because the garage has a fire suppression system (water lines) that need to be conditioned so they don't freeze in cold weather.
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Old 10-29-2015, 03:09 PM   #25
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I performed a couple of investigative tests today. I am plugged into shore power and made a mental note of the read out on my Progressive Industries EMS-HW30C remote which was indicating a 1A draw. I turned on the headlights and the read out changed to 7A. This appears to indicate that the chassis is receiving current from the shore power.

Subsequently I connected my multi-meter to the "jump" leads under the hood while I was connected to shore power and the voltage read out was 13.19v. I then disconnected the shore power and repeated the test and the voltage read out was 12.8v.

My conclusion is that it does seem true that the shore power connection will indeed provide current to the chassis battery. So it appears that leaving the MH plugged into shore power will maintain both the coach batteries and the chassis battery. Therefore it seems this just leaves the argument as to whether it is better to disconnect battery leads and let the batteries sit over winter, or rather leave it all plugged in to maintain the batteries and periodically check water levels.

I do intend to check water levels and periodically exercise the generator and in my case the MH is stored in a garage that is heated to 45F read by a thermostat at eye level by a gas furnace that is 7'8' above the height of the MH, so arguably the ambient temperature is likely closer to 50F in the garage. This is required because the garage has a fire suppression system (water lines) that need to be conditioned so they don't freeze in cold weather.
Excellent intel Duke. I will try the same tests. So, I now wonder why the juice will flow thru to the chassis when the converter/Charge was on, and why it wont draw from the coach when not connected to shore power and you leave happen to accidentally leave the headlights on? I do not have the boost button on mine , do you? If so, did you leave it on boost?
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Old 10-29-2015, 03:14 PM   #26
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Excellent intel Duke. I will try the same tests. So, I now wonder why the juice will flow thru to the chassis when the converter/Charge was on, and why it wont draw from the coach when not connected to shore power and you leave happen to accidentally leave the headlights on? I do not have the boost button on mine , do you? If so, did you leave it on boost?
Can't say I know what a boost button is as this is my first MH. I suspect it's a function that would allow one to "jump" their chassis with their coach batteries if needed. That being the case I do believe these are common on other types (brands) of chassis and I recall having read something about how this is not available on the MBS chassis because of some requirements from the chassis manufacturer.
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Old 10-29-2015, 06:59 PM   #27
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Please let us know what you find
Checked it- did not seem to be charging.
Connected trickle charger to the chassis battery- charging.
Checked the house batteries with the switch both on and off- no apparent charging.
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Old 10-29-2015, 08:31 PM   #28
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Checked it- did not seem to be charging.
Connected trickle charger to the chassis battery- charging.
Checked the house batteries with the switch both on and off- no apparent charging.
I will try the same test, but use the charge feature on a charger I have and let you know if I see any voltage spike into the chassis bat from applying the high charge votage into the house bats.
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Old 10-29-2015, 08:34 PM   #29
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getting more confusing.. LoL
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Old 10-29-2015, 11:43 PM   #30
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Winter Storage MBS chassis battery

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