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Old 12-17-2015, 01:35 PM   #1
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Smile How to bypass batteries and go on shore power?

Want to remove my two batteries and go on strictly shore power. Can I tape up battery cable after removal of batteries?
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Old 12-17-2015, 01:53 PM   #2
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I think if you do that all your twelve volt stuff will be running off the converter? Not the optimum deal.
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Old 12-17-2015, 02:06 PM   #3
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Just curious

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Originally Posted by eldin View Post
Want to remove my two batteries and go on strictly shore power. Can I tape up battery cable after removal of batteries?
Why do you want to remove the batteries?
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Old 12-17-2015, 02:15 PM   #4
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Why not?

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Originally Posted by avionstream View Post
I think if you do that all your twelve volt stuff will be running off the converter? Not the optimum deal.
When I got my Bambi II it had no battery. Ran fine on Univolt until I replaced it with a modern converter.
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Old 12-17-2015, 03:10 PM   #5
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The converter is not intended to be the main power source for the 12 system. The batteries are that main power source. The converter is a battery charger.

yes under light loads the converter will supply 12 volts but it is not intended to be the only source of 12 volt power.

Leave the batteries in. If you do not have a smart converter, one designed for constant use, get one you will be a happy camper.
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Old 12-17-2015, 03:27 PM   #6
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The converter is not intended to be the main power source for the 12 system. The batteries are that main power source. The converter is a battery charger.

yes under light loads the converter will supply 12 volts but it is not intended to be the only source of 12 volt power.

Leave the batteries in. If you do not have a smart converter, one designed for constant use, get one you will be a happy camper.

It's perfectly fine to disconnect the batteries and let your converter supply 12 V while connected to shore power. In fact, while I'm connected to shore power I always leave my Use/Store switch in the Store position so that the converter does not charge my batteries with its single stage charger.

Good practice says to remove the negative connections from the batteries first. It's safer in case you accidentally touch ground while removing the positive terminal.
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Old 12-17-2015, 03:32 PM   #7
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Yes, one can simply remove the batteries and tape, or otherwise protect, the positive cable from shorting to the frame.

The original converters charge the batteries and use them as regulators to some degree. Voltage supplied by the converter alone will move around some as load increases, if the batteries are not in the circuit.

However, I have switch the batteries on and off when on long term shore power to keep them from being over charged without issues.


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Old 12-17-2015, 03:41 PM   #8
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Are you planning to tow the trailer without the batteries in place? If so, I think I'd be a little concerned about the proper operation of the trailer brakes without a battery, especially in an emergency where the breakaway switch is triggered.
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Old 12-17-2015, 04:41 PM   #9
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Yes to the above. You have to have a working battery while towing the trailer it that is a consideration. I worry about the voltage regulation so I keep a batteries connected in mine. I also worry about power failures and like having some battery backup.
Would like to hear more about this. I am a little afraid of frying something that is voltage sensitive due to the lack of regulation
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Old 12-17-2015, 07:54 PM   #10
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Modern switch mode power converters (like what you have in an Airstream) serve 2 functions:

• provide sufficient 12VDC (nominal) for the operational requirements of the DC loads of the RV; things like control voltage for appliances like A/C, control boards, furnace fan, igniter boards, lights, etc.
• they also provide power used to charge the batteries.

We all know how bad the Parallax units are for battery charging, but they actually make a pretty good power source for operational DC in an RV.

This is great IF you don't intend to use your trailer on the road. Once you hitch up, both RVIA specifications AND most if not all local laws require that any trailer that is heavy enough to require trailer brakes MUST have an operational battery with sufficient capacity to engage the trailer's braking system in the event of a disconnect (activation of the break-away switch).
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Old 12-18-2015, 07:07 AM   #11
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I think there are self contained breakaway switches with their own power source,.
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Old 12-18-2015, 08:46 AM   #12
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Trailers that don't have internal battery systems USA a small tongue-mounted battery for break away operation of the trailer brakes.


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Old 12-18-2015, 09:21 AM   #13
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Trailers that don't have internal battery systems USA a small tongue-mounted battery for break away operation of the trailer brakes.

That system would cost about the same as trailer mounted batteries and create a new maintenance problem that most likely would be forgotten.

Why are you considering removing the batteries, weight?
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Old 12-18-2015, 10:28 AM   #14
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In summary:

If you don't plan to move the trailer, then taking out the batteries is fine. Despite some earlier comments to the contrary, the stock converter is perfectly capable of providing you with all the 12 volts power you will need when plugged in to shore power without any ill effects. However, DO NOT attempt to tow your trailer without a properly charged battery as you will not have trailer brakes and will not only be operating your set up illegally but will also have a lot of trouble controlling the rig on the road.

Also, unless you make some changes to the stock Airstream wiring, I suspect that your tongue jack will not operate without the battery as I believe that the jack is wired directly to the battery and not to the breaker panel which is powered by the converter when on shore power.
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