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Old 12-04-2012, 09:41 AM   #15
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In the past I've tried adding filters to the DC power line without success. If the high percentage of ripple voltage is your problem, it's easier, more effective, and probably cheaper in the long run to replace the univolt with a modern converter.
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Old 12-04-2012, 09:42 AM   #16
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We bought the filter from Ebay, didnt notice it was shipping from Hong Kong. Took forever but finally received a few days ago. Ordered another one from Ebay in the mean time from a closer location and got that one in yesterday. The one from Hong Kong is installed currently but as of yet nothing has improved. We are going to try switching it out for the second one received at next opportunity.

We love, love our trailer, but my one lament is having to dump money on boring mechanical issues instead of countertops, curtains etc. Pooh!
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Old 12-04-2012, 09:48 AM   #17
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Think of replacing the converter as an investment, not an expense. With a modern 3 stage converter your batteries will last longer and you will have clean and quiet 12 volt power.
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Old 12-04-2012, 11:33 AM   #18
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Where would one buy the ac-dc filter mentioned in post #1
The best thing would be to install a modern converter that already supplies clean DC rather than keep the old unit that has other problems too.
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Old 12-04-2012, 11:48 AM   #19
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The best thing would be to install a modern converter that already supplies clean DC rather than keep the old unit that has other problems too.
Absolutely!
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Old 12-04-2012, 11:50 AM   #20
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Batteries make the best ripple filters.

If your batteries and battery wiring are in good condition, they'll do more filtering than some gizmo from the Pacific Rim.
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Old 12-04-2012, 04:47 PM   #21
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Batteries make the best ripple filters.
But they have absolutely no means of stopping the mechanical hum caused by noisy transformer laminations.

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If your batteries and battery wiring are in good condition, they'll do more filtering than some gizmo from the Pacific Rim.
Why does it matter where it's from? And by the way, think where the Univolts came from...
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Old 02-14-2013, 12:42 PM   #22
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Hello, time for an update with happy news!
First, we replaced the Univolt which has been great as there is absolutely no more hum! Unfortunately, it had no effect on A/C and water heater.

But, am happy to inform you that I am currently listening to the reassuring sound of cold air blowing from my 15K Dometic Penguin with heat pump. We found a super sharp technician in the Austin area who diagnosed it pretty quickly. Turns out there was a short in the cable that monitors the outside temp. Since we will never use, we disconnected it and, Voila, after months of anxiety it is performing beautifully!

As to the water heater, the tech confirmed that the circuit boards use cheap connectors and the connector needs to be replaced. He will come back sometime soon to fix it.

Hope anyone struggling with this finds this thread before they pull out all their hair and melt into a puddle of primordial goo in a hotbox airstream sitting in the Texas sun.
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