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Old 05-18-2011, 11:23 PM   #1
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Inverter and batteries

I have the Xantrex 1100 and when driving down the road I want to use my inverter but I have found that my batteries are not being charged.
1. Should the alternator charge the coach batteries while the coach is in motion when using the inverter?
2. Can I run the generator to charge the batteries while the inverter is still on while in motion? Note- I do not have a switch inside to turn the inverter on and off. The switch is outside in the storage bay so while in motion I cannot turn of the device.
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Old 05-18-2011, 11:30 PM   #2
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I have the Xantrex 1100 and when driving down the road I want to use my inverter but I have found that my batteries are not being charged.
1. Should the alternator charge the coach batteries while the coach is in motion when using the inverter? Yes. Need to start checking why not.
2. Can I run the generator to charge the batteries while the inverter is still on while in motion? Note- I do not have a switch inside to turn the inverter on and off. The switch is outside in the storage bay so while in motion I cannot turn of the device. Yes, but why would you want to do that? If you are running the generator, simply plug into the 120VAC outlets.
I think you first need to start checking your 12VDC electrical system to determine why the house battery is not being charged while you are driving down the road.
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Old 05-19-2011, 12:09 AM   #3
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X2 coach needs to charge rv section batteries or how do they charge? My truck pulling my travel trailer even chargers rv battery
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Old 05-19-2011, 07:10 AM   #4
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I don't believe the coach batteries charge from the alternator. The coach batteries are charged off the converter or in my case the Inverter when I'm plugged in to shore power. I have 4 coach batteries and expecting the alternator to charge all of them as well as the battery for the engine is more than it's capable of doing. If those batteries charged off the alternator then they would also draw power from the engine battery when not pulled in and using any 12 volts or the Inverter. Eventually if not recharged the engine battery would get pulled down and then you're calling for a jump start.The only way the coach batteries and the front battery are connected is by the Assist Switch on the dash. If your engine battery is dead, you push the switch on the dash and it pulls power from the coach batteries so you're not stranded. This is a momentary switch only. I have first hand knowledge of using the coach batteries to start my engine. My engine battery has to be replaced, one dead cell and it wouldn't crank over until I pressed the switch.
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Old 05-19-2011, 08:53 AM   #5
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Sorry Charlie, I have to disagree (respectfully). There is a device called an isolater which separates your house batts from the engine battery. That way the house batts can never draw down the engine battery. Also, the house batteries do charge from the alternator when you drive otherwise, how would you ever charge your batteries when you spend extended time dry camping without using our generator..Every mh I have had has charged the house batteries while driving. Unless FR has done something dumb to save a dollar, ours should do the same.
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Old 05-19-2011, 09:24 AM   #6
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5th wheel input here, so if I am off base forgive me.

I thought in a MH that all batteries (house and starting) are managed by a battery control center (BCC). That Center houses the isolators, monitors charging state, and contains the momentary relay previously mentioned.

I have a couple of manuals and wiring diagrams here.
Attached Files
File Type: pdf Battery Control Center.pdf (400.2 KB, 173 views)
File Type: pdf Georgetown Battery Connect Center 113174 1 OF 1[1].pdf (318.6 KB, 203 views)
File Type: pdf rv custom products SD1070001[1].pdf (1.34 MB, 111 views)
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Old 05-19-2011, 01:26 PM   #7
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If we assume for a minute that the engine battery is charged from the alternator only, just as with any automobile battery charging system, I'm still at a loss as to why anyone's engine battery might become depleted or dead while camping.
If the ignition key is turned off while camping, why would the engine battery even become drained? (assuming tail/marker/headlights are off)
What creature comforts are needing the ignition key on?
Isn't the living area of the motorhome which requires 12 volts powered by the coach batteries under the stairs?
Aren't the coach batteries recharged by shoreline power?

Just asking because I guess I don't understand the operation of the two systems.
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Old 05-19-2011, 03:34 PM   #8
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Originally Posted by polkatronron View Post
Sorry Charlie, I have to disagree (respectfully). There is a device called an isolater which separates your house batts from the engine battery. That way the house batts can never draw down the engine battery. Also, the house batteries do charge from the alternator when you drive otherwise, how would you ever charge your batteries when you spend extended time dry camping without using our generator..Every mh I have had has charged the house batteries while driving. Unless FR has done something dumb to save a dollar, ours should do the same.
Hey no problem I wasn't 100% sure. The PDFs Herk posted, I've never seen before, and I'm now stealing them by the way, shed some light on the scheme of things. Thanks to all that contributed the info, now we have something to look at with the information from FR.
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Old 05-19-2011, 06:01 PM   #9
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Here's a link that pretty much explains how it all works.

RV Battery

Scroll down to the Batteries and Battery Charging. All the info is there.
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Old 05-20-2011, 06:17 AM   #10
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I think you first need to start checking your 12VDC electrical system to determine why the house battery is not being charged while you are driving down the road.
When I do not use the inverter while in motion the coach batteries are getting fully charged. It's when I use the inverter while in motion the coach batteries are depleted.
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