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Old 09-24-2010, 02:31 PM   #1
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Upgrading converter due to fan noise

I have the Parallax 7455, the stock 55 amp converter for the 2010 classic.

The 7455 is a single-stage unit that produces a compromise output voltage (13.8) that is neither ideal for rapid charging nor long term float.

The more serious problem, though, is fan noise. With more than a token load (turning on a couple lights is enough) the fan starts to cycle. In fact, it sometimes cycles at night, even though there isn't any 12 volt load to speak of, just the fridge, water heater ignition, and maybe the step light.

The converter being 8" away from the ears of someone sleeping on the gaucho, this is a problem.

I'm looking at the Xantrex Truecharge and wonder whether anyone knows if the fan on them runs under light loads.
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Old 09-24-2010, 03:11 PM   #2
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a simple search with the T' word will find only 10 threads...

the xadc versions of this unit have been discontinued.

units manufactured 3-4 years ago are still for sale as "new".

i upgraded (using that word very loosely) to the 80 amp version 2 years ago.

the fan runs MUCH less often than the p'lax replaced.
________

for the next replacement the progressive dynamics line will be considered carefully.

they are widely available, still made in michigan and teh fans also run quiet.
________

IF your question is related to the newest made in china xantrex t' models...

i see only one thread and no one posting in regard to actually using one.

but a lot of threads on c/c fan noise and how to solve that issue.

cheers
2air'
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Old 09-24-2010, 03:30 PM   #3
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I was thinking of these units:

Xantrex TrueCharge2 Chargers

I believe it's quite a different design than the discontinued XADC devices.
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Old 09-24-2010, 03:41 PM   #4
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yes it is and as noted near the end of the post i can fine ONE THREAD referencing that model to date.

and no actual users yet, but maybe this will ferret them out.

Quote:
Originally Posted by Jammer View Post
...The 7455 is a single-stage unit that produces a compromise output voltage (13.8) that is neither ideal for rapid charging nor long term float...
and to repeat for the UMPteenth time...

the p'lax 7455 is NOT a single stage unit.

this is misinformation that was ROUTINELY promoted here

to fertilize discontent and sell replacements...
_________

as an editorial aside, i find MOST of the xantrex bits now produced...

2b very poorly constructed with marginal bits (even by chinese-canadian standards)

clearly at 1 time the X products were to be respected,

now the brand name is hollow and the products mostly junk.

with warranty/service needs KICKED from the vendor to the manufacturer..

in other words GOOD LUCK getting help with it.

so please buy one and give a first hand report...



the progressive dynamics stuff on the otoh is WIDELY available,

can be serviced by national rv store chains OR by the domestic manufacturer...

in fact one can DRIVE to the plant/warehouse/offices if needed.



cheers
2air'
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Old 09-24-2010, 04:21 PM   #5
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Quote:
Originally Posted by 2airishuman View Post
and to repeat for the UMPteenth time...

the p'lax 7455 is NOT a single stage unit.

this is misinformation that was ROUTINELY promoted here

to fertilize discontent and sell replacements...
2air I was reading the manufacturer's literature and it describes a single stage unit.

http://www.parallaxpower.com/7400/74...ctbrochure.pdf

Perhaps you're thinking of the 7455T... a DIFFERENT unit than the one in my traylah. I looked at the label this morning and there is no T. Even the T units operate strictly on an 8 hour timer basis, do not trigger a shift to float based on a decline in charge current, and are not temperature compensated.

And I have not noticed the step down from absorption to float that is characteristic of a multi-stage model.
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Old 09-24-2010, 04:32 PM   #6
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Quote:
Originally Posted by 2airishuman View Post
as an editorial aside, i find MOST of the xantrex bits now produced...

2b very poorly constructed with marginal bits (even by chinese-canadian standards)

clearly at 1 time the X products were to be respected,

now the brand name is hollow and the products mostly junk.

with warranty/service needs KICKED from the vendor to the manufacturer..

in other words GOOD LUCK getting help with it.

so please buy one and give a first hand report...



the progressive dynamics stuff on the otoh is WIDELY available,

can be serviced by national rv store chains OR by the domestic manufacturer...

in fact one can DRIVE to the plant/warehouse/offices if needed.



cheers
2air'
Duly noted.

I think that Xantrex are the only manufacturer that really get it regarding lead acid battery technology and what is necessary to make it perform well. The big 3 automakers all switched to temperature compensated charging DECADES ago. You do not need a Minnesota winter for the temperature changes to be significant. Voltage that is just right at 75 degrees will not produce a full charge at 50 and will shorten battery life by half at 90.

Iota and PD are power supply companies that don't understand batteries. Both of them take a bolt-on approach to making a power supply into a battery charger with their charge wizards and IQ4s. NEITHER of which looks at temperature, or current. Just voltage and time.

The thing is that in this day and age a Microchip PIC controller costs less less than a buck and includes the a2d and d2a right on the chip that you need to build this sort of control into the converter. There is really no excuse for half-baked timer only solutions.
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Old 09-24-2010, 05:02 PM   #7
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yeah perhaps it's the T model (an accessory bit)

what i do know is that the p'lax ALWAYS appeared to provide 2 distinct voltages on the digital display...

something like 13.8/9 and 13.3/4 while on shore or generator power,

but it's been a while since the unit was replaced.
________

i am not a power supply company and don't claim to understand batteries...

but on YOUR trailer the batteries are 'sorta' indoors...

and less subject to temperature extremes IF the unit is warm.

it is very simple to OPEN the battery hatches and add a layer of bubble foil...

OR one can simply COVER the external battery hatches to further improve insulation.

i have used the on board batteries to ~5-8 degrees F with big arse winds...

they still performed well but getting to a WARMER location is a much better solution.

camping at near/sub zero is still best done in a house of icensnow...

cheers
2air'
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Old 09-24-2010, 06:45 PM   #8
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I have a Parallax 7455 and the fan is sounding sickly. I'd like to just replace the fan... anyone have a source?
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Old 09-24-2010, 07:09 PM   #9
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Quote:
Originally Posted by dmac View Post
I have a Parallax 7455 and the fan is sounding sickly. I'd like to just replace the fan... anyone have a source?
r u sure?

my understanding is/was the safaris n those years had the 73xx series p'lax.

except for some fuses these things are labeled as no user serviceable parts...

no doubt some1 has swapped fans.

have u checked it for stuff on the blades or in the venting?

i regularly blow compressed air into the area and all sorts of dust bugs crawl out.

cheers
2air'
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Old 09-24-2010, 07:18 PM   #10
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According to the label it is a 7455. I just vacumed the fan and exhuast holes and the fan speed picked up and it is quiet. Problem solved!
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Old 09-24-2010, 08:22 PM   #11
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ok good info all around...

it probably still had metal shavings and rivet droppings from assembly in there...





cheers
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Old 09-24-2010, 08:41 PM   #12
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I installed a 60 amp Intelli-Power unit in my B-van about two years back, after noticing the same thing you did with the fan and other electrical issues (flickering florescent lights, etc.), although I didn't actually replace it until it got down to about 10 volts output.

I think I've heard the fan run once in the entire time I've had it, and that was on a really hot day.

Obviously a B-van really doesn't really need 60 amps of power. I believe the original converter was 32 amps. I was sort of thinking a larger unit wouldn't have to work as hard.

This was a great upgrade. Obviously I had to do something, but at the same time I put in a decent deep cycle battery and the system has been working absolutely perfectly since, without cooking the battery.
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Old 09-24-2010, 09:06 PM   #13
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Agree 100% with Skater. I put a PD 9160 in a couple of years ago, and the only time the fan ever came on was when I forget to plug the trailer in and ran the battery down to almost dead.

@Jammer-I see you're in Nerstrand now instead of N'field. Did you get flooded out?
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Old 09-25-2010, 11:39 AM   #14
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The 7400 series IS a single stage 13.8 VDC unless it has the T (timer) option, then its a two stage. Problem with the T option is the length of time it stays at the high 14.2 voltage output. Timer is set for 13 hours. Way too long.
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