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Old 08-23-2014, 09:18 AM   #1
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Newbie needs to test Univolt IV system

I am trying to inspect my electrical system today.
I looked into the rear compartment and found a rusty Univolt IV with a blown battery fuse.
I was going to replace the fuse, plug into house power with my 15amp adapter, and check voltage at the battery terminals with my digital multimeter.
Is this all there is to it? Is there anything else I need to know.
Can I get a/c power to the trailer without a battery?
Any help is appreciated. I'm a newbie to trailers and trailer repair.
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Old 08-23-2014, 09:56 AM   #2
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Old Univolts liked to have a battery in the system for more stable voltage, so you may get strange results if you're measuring the output without a battery connected. I don't know what exactly the difference would be, I'm just going on the reports of people experienced with this.

I can say that I'm very happy with the performance of more modern 3-stage converters like my Powermax Boondocker, and no one seems to complain about Progressive Dynamics or Iota 3-stage converters.
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Old 08-23-2014, 10:13 AM   #3
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Thanks for the tip.
I guess I can hook up one of my 12 volt 35ah batteries to give it a test.
I'd like to avoid replacing the Univolt just yet if I can.
When I do I am going to be installing my 250watt solar panel and a MPPT inverter.
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Old 08-23-2014, 01:17 PM   #4
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Just turn the breaker off for the Univolt. Then disconnect the Univolt.
You will only have AC power to the outlets. No lights or any other 12 volt devices.
A new converter should be on the top of the "to do" list. Especially if you buy a new battery.
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Old 08-23-2014, 03:47 PM   #5
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This might be a stupid question but where is the breaker for the univolt?
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Old 08-23-2014, 06:57 PM   #6
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It is in the 120 volt power panel. A panel with circuit breakers similar to what is in your house.
If the Univolt is powered chances are it is making a humming sound. You will know when it goes off.
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