Power Convertor for LED Lights - Fiberglass RV


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Old 04-22-2015, 02:01 PM   #1
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Power Convertor for LED Lights

I am converting all the lights on our 1977 Surfside to LED . The power convertor is probably the original Powertron PM901A and the new lights flicker . From what I have learned this is caused due to the fact that the old covertor produces 12 volt ac current and since the LED's are polarity sensitive they are only lighting half the time . I would not mind replacing the convertor , since the old one hums quite loud , annoying since it is right under the bed. My question is how can I be sure that the new one will not be the same ? The ones I have been looking at are the Hengs ELX12 or the WFCO WF 8712P . Anyone have any advice ? Thanks Bob
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Old 04-22-2015, 02:46 PM   #2
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I don't know the answer, but my LEDs do not usually flicker running on the original converter in my old Scamp. They do however flicker when the auxilary fan is running that I mounted to help the side mount A/C unit cool on really hot days. I only run the fan during the day when we don't need the lights so it has not been a problem. Note that I do not currently have a battery mounted. I wonder if a battery in the circuit might help "even out" the flow and help prevent flicker? Also, could your issue more properly be called 12V "pulsating" DC rather than calling it AC? I am sure one of our resident Electrical Engineers will be along shortly.
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Old 04-22-2015, 04:37 PM   #3
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A new converter should put out DC as it charges the battery also.
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Old 04-22-2015, 04:45 PM   #4
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Look at this:
Power Supply 110V Converter 12V - $65.95
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Old 04-22-2015, 04:51 PM   #5
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Not to get to complicated, but sounds like you might have "Half Wave DC" if they are pulsing at 30 times a second that's what's happening, you are only getting one/half the ac sine wave, it's DC, but it sux for your LEDs.


I don't know anything about the ELIX12, but I have seen a lot problems with the Chinese made WFCO's. Scamp used to use them (ours smoked) and has since gone to the PD-4045 I recommend below.


For just a few $$ more you can get a Progressive Dynamics PD-4045 that will take care of everything, give you a new AC distribution system, a 45 amp converter (super clean) with 12 fused circuits for anything you might want in the future, and a 3 stage smart battery charger. Usually available on-line for less than $175/ I have installed a number of them in RV's without any problems.
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Old 04-22-2015, 07:18 PM   #6
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Food for thought...Not all LED bulbs are created equal. If the LED bulbs were made for Automotive light bulb replacements they are more sensitive to the fluctuation in power and will dim and brighten as the voltage varies. If the LEDs were made for the RV/Marine customer they are made with a wider variance of acceptable voltage.

At least that's what I have read.
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Old 04-22-2015, 07:50 PM   #7
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You may have a bad capacitor in you converter which can cause you to have pulsating DC or as Bob suggested a bad rectifier (diode) Neither is hard to repair or costly.
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Old 04-22-2015, 10:53 PM   #8
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Originally Posted by Bob in Mb View Post
From what I have learned this is caused due to the fact that the old covertor produces 12 volt ac current and since the LED's are polarity sensitive they are only lighting half the time . I would not mind replacing the convertor , since the old one hums quite loud , annoying since it is right under the bed. My question is how can I be sure that the new one will not be the same ? The ones I have been looking at are the Hengs ELX12 or the WFCO WF 8712P . Anyone have any advice ? Thanks Bob
Funny I was speaking with well known fiberglass trailer manufacture about the same issue, as my LED's stated to suddenly flicker last summer when plugged in but not when not plugged in. They suggest that in their experience it was an indication that the converter is on its last legs and not delivering power at a nice smooth rate. They had apparently had some experience with fairly new converters having the same problem - just before the converters out and out failed.

I was told a new converter regardless of make should fix the problem although the Progressive Dynamic converters with the smart charge are a popular one on this forum.
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Old 04-22-2015, 11:17 PM   #9
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Gee Carol, guess that wasn't Scamp and a WFCO converter was it? I wondered why they dumped WFCO for PD, which is substantially more expensive.... LOL
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Old 04-22-2015, 11:35 PM   #10
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Gee Carol, guess that wasn't Scamp and a WFCO converter was it? I wondered why they dumped WFCO for PD, which is substantially more expensive.... LOL
Nope it wasn't Scamp I was speaking with - a more local to me company that is nice enough to do updates and/or repairs on my Scamp even though they build SOB of fiberglass trailer and nope my old converter is not a WFCo converter & pretty sure the party I was speaking with has never used the old converters Scamp was using at one point in their trailers either.
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Old 04-23-2015, 09:16 AM   #11
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Thanks everyone for your help , I will search out a Progressive Dynamics product . Anyone else have suggestions I will keep watching . Thanks again Bob
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Old 04-23-2015, 02:11 PM   #12
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Hi Again , My local RV supplier suggests an Inteli Power 9100 . Anyone have any experience with this unit ? Thanks Bob
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Old 04-23-2015, 03:35 PM   #13
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A new set of filter caps in the charger will fix it and if there is no battery installed that might also do the trick.
New is good too.


Sent from my SCH-I605 using Fiberglass RV mobile app
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Old 04-23-2015, 03:38 PM   #14
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The Intelipower 9100 is only a Converter Charger. The PD-4045 has a complete AC distribution panel, a 12 circuit fused DC distribution section as well as a converter and a smart charger. Currently about $175 at vintagetrailersupply.com. Lower prices may be available.


That way you can update and up=grade to 2015 electrical standards and future needs in one fell swoop...
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