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Old 04-17-2009, 02:09 PM   #1
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Parallax Converter Replacement with Xantrex

Our Parallax Power Center, Series 7300 (specifically 7355), has a converter that failed during the two year warranty period of our 2007 23’ Safari and was replaced with another Parallax converter by our dealer last September. Last week the replaced converter also failed.

Based on good reports from others here on the forums, we decided to call Randy and order the Xantrex XADC 60A Converter/Charger (Hard wire) from BestConverter.com.

Unlike our two-stage Parallax converter, the Xantrex’s three-stage charging process results in batteries charging faster and more effectively. Xantrex’s 3-Stage White Paper (see link on BestConverter.com) describes the stages:

The first stage, bulk, is a constant current mode that replaces 80% of the battery’s capacity quickly. The charger applies its maximum output current as the battery voltage rises. When the battery voltage reaches a predetermined absorption voltage, operation switches to the second stage.

The second stage, absorption, is a constant voltage mode and replaces the remaining 20% capacity. The charger voltage is held steady while the current falls as the battery approaches full charge.

In the third stage, float, the charger voltage is lowered and held constant at a safe value of 13.5 volts DC, which prevents the battery from being overcharged, while allowing the charger to supply enough current to maintain the battery at a full state of charge.

The Xantrex converter arrived quickly via FedEx from BestConverter.com. Randy steered me to the Parallax 7300 Upgrade Procedure link on their website. This procedure, “Parallax 7355 Converter Replacement with Xantrex XADC-60”, was written by Ernie Hensley of Spokane Valley, WA, who has a 28’ 2005 Airstream Safari. His procedure has detailed instructions and photos, which greatly assisted me. He also kindly answered my questions via email. I downloaded Ernie’s photos into our laptop MacBook Pro, to have nearby as I followed his procedure.

This and following posts will describe and illustrate how I replaced our Parallax converter with the Xantrex. It is not intended to tell you how you should replace yours. It is posted to show what worked for me, which may be helpful to others.

First I disconnected the 30-amp shore power. Then I turned the Battery Disconnect Switch to “Store” and used a voltmeter to ensure that no battery power was reaching the converter. Note, as pointed out by Ernie, it may be safer to disconnect the batteries at the battery terminals, but again, this is what worked for me. Our power center is located in the middle of our trailer under the double wardrobe closet.
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Old 04-17-2009, 02:22 PM   #2
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I then removed the face plate revealing the old converter. Again, note the voltmeter which I used to make sure that there was no battery voltage reaching the converter.

(By the way, the original symptom that the converter had failed was that the batteries were not showing 100% when the trailer was connected to shore power and was diagnosed when the voltmeter read that the converter was only putting out 9.69 volts while the Battery Disconnect Switch was turned to "Store".)
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Old 04-17-2009, 02:26 PM   #3
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I then disconnected the converter's AC power black wire from the 20-amp circuit breaker and the white wire from the white wire terminal strip.
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Old 04-17-2009, 02:31 PM   #4
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Here both of the converter's AC wires are disconnected.

Note the grounding terminal strip on top of the AC side. This will be used by the new Xantrex converter. (The old Parallax converter did not have a ground wire.)
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Old 04-17-2009, 02:38 PM   #5
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I then disconnected the converter's DC wires, blue (positive) from the front and white (negative) from the back of the DC board.

The wires were then pulled through the grommets and the Parallax converter was removed.
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Old 04-17-2009, 02:45 PM   #6
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The core concept of Ernie's procedure is that the old converter's circuit board can be removed from its metal enclosure and this enclosure can be modified to nicely receive and mount the Xantrex converter.

At this stage the enclosure's top panel is removed by drilling out the rivets. Then the sheet metal baffle inside is removed by drilling out the spot welds.
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Old 04-17-2009, 02:49 PM   #7
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The circuit board is removed off of the bottom standoffs.

I trimmed the two nylon standoffs to match the height of the metal standoffs.
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Old 04-17-2009, 02:58 PM   #8
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Now it gets interesting...

Following Ernie's procedure, I custom-made two mounting rails, made from 1/2" aluminum channel from Home Depot ($9.39).

I used the Xantrex deck-mount brackets as templates. Then I drilled 1/8" holes through both sides and 1/4" holes on one side for screwdriver access.
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Old 04-17-2009, 03:27 PM   #9
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The mounting rails were then attached to the Xantrex converter with the supplied Xantrex bracket screws.

The converter with the attached rails was placed in the modified enclosure on the standoffs (it was a snug fit, width-wise).

I then drilled a hole on each side of the enclosure and placed #6, 1/4" flat Phillips zinc metal screws to attach the converter/rail to the enclosure.

Before I reattached the top of the enclosure, I drilled a 1/2" hole in the top on the front left side to position over the hole below on the converter. I then inserted a rubber grommet (5/8" outside diameter, 3/8" inside diameter from Lowes) and pulled the wires through the top's holes while placing the top onto the enclosure.

I drilled three holes on the top and enclosure which was then secured with #4, 3/8" sheet metal screws.

(Note Ernie cut a 1" hole on his top and supplied the necessary grommet, but I did not have a drill bit that size.)
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Old 04-17-2009, 03:39 PM   #10
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It turned out to be a very nice fit.

The Xantrex black and white AC wires were re attached to the Parallax Power Center, and the green wire from the Xantrex was attached to the grounding terminal strip on the AC side.

The Parallax's DC blue and white wires were reused to connect the Xantrex to the Parallax Power Center's DC side.

The converter/enclosure was secured to the Power Center with the original screws.
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Old 04-17-2009, 03:57 PM   #11
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I reconnected the shore power and turned the Battery Disconnect Switch to "Use".

I was pleased to see that the Xantrex converter's voltage output to the battery was reading 14.2, which is expected in the first stage of charging our batteries back to full charge. (Remember this is a three stage charger).

By the way, what saved our AGM batteries during our two previous Parallax converter failures were our two factory-supplied solar panels.
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Old 04-17-2009, 04:01 PM   #12
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Great job SilverGate. Though I went with the WFCO kit Randy sells (less fabrication) it is a great idea to dump the 2 stage charger that comes factory installed.

It's amazing that after all these years, they still put the cheezy 2 way converter chargers in Airstreams......
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Old 04-17-2009, 04:37 PM   #13
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The Xantrex XADC 60A Charger/Converter installation is now complete.

Thank you Airstreamer Ernie Hensley for your illustrated article, "Parallax 7355 Converter Replacement with Xantrex XADC-60", and for kindly answering my questions.

And thank you to the handful of Airforum members that were supportive and sent comments and answers to me during this challenging time... you will get private note of thanks from me.
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Old 04-17-2009, 06:25 PM   #14
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And a special thank you to Larry who was my resource when I had technical questions along the way. (He is more talented with using tools than I am... Just see his refrigerator fan switch that he installed earlier this year.)

He did the drilling out of the rivets seen in post #6 and the testing of the voltage in post #11 above as I took photos.

And I thank him for letting me proceed on my own for the most part and get a great hands-on experience and sense of accomplishment.
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