I bet you could get at least $25.00 for it on ebay! Just rememember it is "rare" and "original" and they don't make them like this anymore! A new one could cost you 200.00 or more at the local RV dealer!
With tongue firmly planted in cheek................
__________________
Brett G
WBCCI #5501 AIR # 49
"Stop worrying about the potholes in the road and celebrate the journey." -- Fitzhugh Mullan
Wise men talk because they have someting to say; fools, because they have to say something. -- Plato
In politics, absurdity is not a handicap— Napoleon
I actually do have a box where I keep all the outdated and non-working original parts, who knows, someday they may be worth some bucks!! Actually my Airstream dealer kinda wants it for parts, guess it may still have some life in it.
Got the new 60 amp Intelli-Power installed today. Tell me something, my old univolt weighed 39 lbs and the Intelli-Power weighs about 5 lbs., what gives?? Old school, new school?
Ok, tell me what I am missing here. I see many posts talking about Univolt systems overcharging batteries, so I went to my trusty owners manual for my '78 Excella 500 and read...
"When your Airstream is hooked up to 120 volt A.C. the Univolt System automatically charges the trailer battery and, if it is hooked up, your automobile battery as well. The speed and degree of charge depends on how much power is used for lights and appliances, as only the surplus goes to charging the battery.
... Whenever possible, use the automatic built-in charger of the Univolt System for charging. The charging circuit automatically controls the current, reducing it as the battery increases in charge."
From the sound of this, the Univolt System handles it all. Mine makes a slight buzzing noise, which I understand is normal. Did older Univolt Systems not have a charging circuit that limited the charge?
Vic
__________________
Vic Smith
WBCCI #6782
31' 78 Airstream Excella 500
2001 Ford Excursion V-10
Reese hitch and dual cam sway control
The reason for the HUM is that the AC electricity running through the windings in the transformer causes the lamination plates to vibrate at 60 cycles and thus it hums.
Because of the magnetic field
The answer is to move the transformer. SORRY
Other than taking the transformer out and binding the plates and dipping in a varnich (and that may not help) I can only sugest that two sticks of dynamite or the same can cure it. Or don't plug into external AC
My magnetec make too a noise like you but in 50hz and I think the noise is the same;
To attenuate it, I've put a polystyren plate under the univolt because it was fixed on a wood plate on the furnace tunnel and , in this way , you really heard the sound vibrations from there, in the bathroom.
With the ploystiren plate, the humm is very light, nearly inaudible.
If that can help you...
the prior owner has equiped a switch too, to stop the hummm during the night surely.
I never even heard my univolt at all while I was plugged in at KOA. It's under the right twin bed which my youngest son sleeps on. He never said anything about a hum keeping him awake. Now that makes me curious as to wether it's even working! I will check soon...I really appreciate all the brainstorming here, although it may get expensive
Not all but many are merely an AC transformer that have voltage doubling and a diode arrangement to supply 12 volts to the trailer and charge the batteries.
A 55 Amp unit is capable of delivering up to 55 Amps but does not push 55 Amps through your battery.
It is like having a gallon bucket and taking out only a once at a time or what you need. one ounce , two , or more, but capable of 55 amps if needed.
Your battery has an internal resistance, and this is low when the battery is used up and the current from the charger will supply enough voltage and current to charge the battery. As the battery is charged the internal voltage will rise in the battery and the resistance increases, and limits the charging current. Once fully charged the voltage in the battery is the same as the charger and little if no more current is delivered to the battery.. An automatic limiting system.
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