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Old 02-19-2011, 09:15 PM   #1
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converter size

I am needing a new converter, I was thinking an Intela-power 9200 45amp. Is that enough amps?
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Old 02-19-2011, 09:18 PM   #2
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If it were mine I'd do an energy audit. Add up the wattages (convert to amps) of the lights (by far the biggest draw), furnace, water pump, fridge 12 volt, water heater control, etc. 1141 lamps take 18 watts.

Probably a little overdraft with it all running simultaneously (because you typically don't) is OK, but I'd shoot to cover it completely. My trailer uses 55 amp converter and I can't overdraw it with everything lit and on. The lights alone draw nearly 400 watts (at least before I converted to LED).
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Old 02-19-2011, 10:54 PM   #3
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It's Plenty

Most trailers that are in the age group you have probably don't have a converter larger than 30 amps. Is the original still in the trailer? If it is; you should be able to check the size of the largest fuse. I would think that 45 amp would be plenty if you are just replacing the original.
The lights in the trailer draw 1.5 amps per bulb, not per fixture but per bulb. The ceiling fans around 4 or 5 amps, furnace blower maybe 6 amps. I think you would have a problem getting all to add up to 30 amps, let alone 45.
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Old 02-20-2011, 07:31 AM   #4
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I just installed the same in my 71' Overlander, and everything seems to be fine with everything turned on and running (of course, our is completely original, so your mileage may vary).
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Old 02-20-2011, 07:38 AM   #5
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Airstream currently installs 55amp converters;so if you are updating your trailer you would want the upgrade to have flexibility not just be on the edge of what you may need.Airstream uses Parrallax and Magnetek converters.
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Old 02-20-2011, 08:41 AM   #6
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There are a couple of advantages to having a slightly larger converter than that needed to simply run the trailer:

  • In cases when you've hooked up w/ low batteries, they will still change at a reasonable rate even when you're using juice in the trailer.
  • If you have fitted dual batteries, having a bit more charging current could speed things up - handy if you're recharging w/ a generator.

If you don't boondock, your batteries essentially never discharge and none of this matters anyway.

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Old 02-20-2011, 05:43 PM   #7
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With only one battery, 45 should be fine on a 29 footer. Two batteries and I would consider 55 amps depending on how you use your Airstream.
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Old 02-20-2011, 05:48 PM   #8
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I purchased an Iota converter from Randy, great product and great service.
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Old 02-20-2011, 06:58 PM   #9
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Yes that would do the job.

I think the 9260 is the best bang for the bucks I went with the 9260 or could have been a 9265!
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Old 02-20-2011, 07:35 PM   #10
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The PD units are pretty good. They don't have the high charge voltage like the Iota's and don't deliver their full rated output during bulk but I still like them. For off grid boondocking and/or fast complete charging, the Iota has the edge.
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Old 02-20-2011, 07:52 PM   #11
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Thanks for the input, I purchased a 9200 45amp. I only have one battery, am mostly original, and really dont boondock. My old one was a 30amp. Thanks again!
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