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Old 10-28-2015, 01:24 PM   #11
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I was hoping someone with knowledge of the chassis and house batteries connect would chime in. I did a little research and this is what I came up with- the chassis and house batteries are isolated (not connected) to each other when the vehicle is not running through a battery isolator/management system. When the vehicle starts up it "charges" the system and allows the chassis to charge both house and chassis batteries. Without this isolator the house could draw down the chassis battery leading to a no start situation. I found my isolator/management system behind a cover to the left of the steps as you walk in to the MBS.
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Old 10-28-2015, 02:52 PM   #12
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I did some further investigation and the system is isolated by the separator solenoid in the step by the house battery and a diode to prevent any power from going back toward the front. The solenoid is only activated when there is power on the ignition wire (starting or running the engine). Putting a charger on the chassis battery will not allow juice to the coach. I will go with my solar, disconnect the coach batteries from the coach and allow the solar charge the coach. I will put a DC Trik-L Charger on those and connect to the chassis. This will charge/maintain both systems. That Trik-L Charger is around $50

I appreciate all of the feedback
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Old 10-28-2015, 05:31 PM   #13
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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
After I typed my post-I thought of just that.
Why not check it myself. DOH !
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Old 10-28-2015, 05:39 PM   #14
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After I typed my post-I thought of just that.
Why not check it myself. DOH !
Please let us know what you find
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Old 10-28-2015, 08:07 PM   #15
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Interesting stuff. Reading this I wonder can anyone point out the terminal connection coming into the Battery Manager, that goes to the chassis battery. Then you could connect there with a float charger to catch the chassis battery as well
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Old 10-28-2015, 10:21 PM   #16
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I suppose I still don't understand why you couldn't leave the coach plugged in, especially with a 4-stage converter on board. For the chassis battery I plan to use a CTEK charger to maintain it during long storage periods. I actually figured I would just plug in the CTEK to a coach outlet so I didn't have to leave a window or door open to run the electrical wire to an exterior outlet.
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Old 10-28-2015, 10:46 PM   #17
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I suppose I still don't understand why you couldn't leave the coach plugged in, especially with a 4-stage converter on board. For the chassis battery I plan to use a CTEK charger to maintain it during long storage periods. I actually figured I would just plug in the CTEK to a coach outlet so I didn't have to leave a window or door open to run the electrical wire to an exterior outlet.
If the the coach is plugged in, it will keep the chassis battery topped off.

for an experiment, turn on the headlights, you'll hear the charging start in the coach until a little after you turn them off again ( assumes you are plugged in )
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Old 10-28-2015, 10:59 PM   #18
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OK, I'm thoroughly confused. Post #11 is consistent with my prior understanding the the coach and chassis batteries are isolated unless the engine is running. If the engine is running it will charge both the chassis and coach batteries. My understanding was that MB mandates this isolation and therefore prevents us from using the coach batteries to jump the chassis battery if ever needed. But you're saying if I'm plugged into shore power that will not only charge my coach batteries through my converter but also maintain my chassis battery?

On a different note I've read a lot of information from various online sources and there's some wildly different views on leaving the MH plugged into shore power for extended periods and relying on the converter to maintain the coach batteries. In dissecting all of this information there's a clear divide in the approach between those that have a single stage converter (battery boiler) and a multi-stage converter. That seems quite apparent to me. Reading further some argue that there's no point and simply disconnecting the coach batteries is sufficient. Many leave their MH plugged in 24/7 unless they're traveling or dry camping. And some argue that the prolonged use of the converter adversely shortens its lifespan.
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Old 10-28-2015, 11:24 PM   #19
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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).
Ditto. Been leaving LA batteries out in the cold (-20 to -30) for years. Check em every couple of weeks and charge as required. A good battery will go six weeks to two months before the charge drops below about 75 percent.
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Old 10-29-2015, 09:23 AM   #20
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If the the coach is plugged in, it will keep the chassis battery topped off.

for an experiment, turn on the headlights, you'll hear the charging start in the coach until a little after you turn them off again ( assumes you are plugged in )
So, according to your observation, the BCC (battery control center) must sense the load from the headlights draw, and call for juice from the converter to meet the demand. 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.

Wouldn't a volt meter test on the chassis battery, as the converter spoils up to supply juice to the demand, proff that assumption. I think if BbClemens could have an FR EE talk to this topic, it would be much appreciated.
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