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Old 07-20-2006, 08:15 PM   #1
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1985 31' Limited
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What type of converter is standard in 85 limited?

I recentely purchased an 85 31' limited. Batteries do not hold a charge past 2 days. My converter is a Triad-ultra Model Tu-750-6. Is this the original? Can anybody tell me anything about It? Any info would be appreciated. THANKS. Jack
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Old 07-20-2006, 08:43 PM   #2
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Univolts were the standard, many have now replaced with Intellipower, or similiar.
Have you put a volt meter on the terminals to see what it is putting out?
The batteries may be overcharged and now bad. Many owners have let the chargers fry their batteries.
If that is the case a battery disconnect will work to prevent that while plugged into shore power for long periods.
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Old 07-20-2006, 10:54 PM   #3
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Quote:
Originally Posted by jlsmits
I recentely purchased an 85 31' limited. Batteries do not hold a charge past 2 days. My converter is a Triad-ultra Model Tu-750-6. Is this the original? Can anybody tell me anything about It? Any info would be appreciated. THANKS. Jack
JL,

That's 'Triad-Utrad'. They are the manufacturers of the Airstream 'Univolt'. As ALANSD said, lots of folks replace the 'Uni' with a modern converter with 3-stage 'smart charging' capabilities. There are several to choose from.....WFCO, Intellipower, and a few others. I would go for this conversion when you buy new batteries, and they will love you for it!!
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Old 04-09-2011, 11:12 AM   #4
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my 85 345 has a triad-ultra TU 750-6 and it appears to have died
so I gues the idea is to replace it with a modern unit like WFCO and Intellpower
are theseeasy to get locally or is it an internet deal
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Old 04-09-2011, 12:00 PM   #5
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Originally Posted by Paul J Mauro View Post
my 85 345 has a triad-ultra TU 750-6 and it appears to have died
so I gues the idea is to replace it with a modern unit like WFCO and Intellpower
are theseeasy to get locally or is it an internet deal
I guess the answer in my case is "Yes."

When I replaced the Univolt in my Trade Wind several years ago I bought an Inteli-Power locally. More recently, I changed out the one in my Excella I got the Inteli-Power online, from Best Converter. Randy at Best Converter is also 68 Overlander here on the forums.
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Old 04-09-2011, 02:39 PM   #6
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the charger

Quote:
Originally Posted by jlsmits View Post
I recentely purchased an 85 31' limited. Batteries do not hold a charge past 2 days. My converter is a Triad-ultra Model Tu-750-6. Is this the original? Can anybody tell me anything about It? Any info would be appreciated. THANKS. Jack
The charger is suppose able to tell where your battery is at (fully charged vs. Low) and send power accord. If it is low it is suppose to send 13.6 volts no higher. Once it is fully charged it is suppose to bump back to 12.5 VDC. That is the smart charge. I have found this fetcher to be intermittent on some of the old Univolts. If it stays at 13.6 or higher it could boil the water out of your batteries and then stick a fork in it cuz it is done. If the batteries are low of water use distilled water only. Wal-Mart has it in the drink section.
Having a smart charger that works is smart.
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Old 04-09-2011, 05:18 PM   #7
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Originally Posted by Dan@LED4RV View Post
The charger is suppose able to tell where your battery is at (fully charged vs. Low) and send power accord. If it is low it is suppose to send 13.6 volts no higher. Once it is fully charged it is suppose to bump back to 12.5 VDC. That is the smart charge. I have found this fetcher to be intermittent on some of the old Univolts. If it stays at 13.6 or higher it could boil the water out of your batteries and then stick a fork in it cuz it is done. If the batteries are low of water use distilled water only. Wal-Mart has it in the drink section.
Having a smart charger that works is smart.
Dan,

You voltages are off for a modern 3-stage converter/charger. Typically, a battery is at 50% depth of discharge at 12.2 VDC and re-charging should commence. Depending on the battery type, chargers should send anywhere up to 14.4VDC to the batteries during the bulk charge phase (the amperage stays constant and the voltage increases) for approximately the first 80% of the charging cycle. The absorption or taper charge that follows keeps the voltage the same but 'tapers' the amperage until the battery is at 13.2VDC. Then the 'float charge' begins and maintains the battery at 13.2VDC. The 12.5VDC figure that you use above is actually represents only 75% full battery, or 25% depth of discharge. Full batteries measure anywhere from 12.8-13.2VDC, again depending on the type of battery.

Since all liquid acid batteries outgas during charging, causing extensive corrosion of the terminals and surrounding area, I recommend AGM batteries as they never need maintenance and do not outgas nor cause corrosion when properly charged.
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