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Tool Talk Discussion Board

Portable Generator mod question

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Posted by LJD on September 14, 2012 at 15:45:00 from (

I've got a couple of brand new generators made in 1999. They were special ordered by a telecom company that went out of business. The problem is - they are set up to make 36 volts DC which is of no use to me. I'd like to convert to AC or to 12 volts DC output.

The generator head is rated for 3000 watts surge and 2500 watts continuous. 67 amps at 36 volts DC. I suspect the same head was also use in 120/240 volt versions, but I'm not sure.

The engine is a Subauru EH25 and is setup to run on gasoline or propane and has electric start.

I was told this generator was custom made from an existing AC generator. True or not, I'm not sure. It's supposed to be a reworked Powe'r Guard R45 genset. Powe'r Guard no longer exists. It was taken over by Baldor and they have no info.

I pulled the cover off the generator head and there are three large wires coming out of it. They hook to a large terminal block. On the same block are two output terminals - marked AC - one is "plus" and other "minus" so the "AC" does not make sense to me since the output is DC. Then there's a small, sealed in epoxy regulator with four leads and four small wires - some go to small brushes in the gen-head. The regulator is made by Basler Electric - and is marked: Input 180-270 VAC 50-60HZ, and Output - 63 VDC at 2 amps. Maybe this makes the field current? The four terminals on it are marked F+, 3, F-, and 4. The two F wires go to brushes.

If this was an AC genset -would there be some sort of regulator? I've worked on big sets (15KW and 20KW) but have no experience with little ones like this.


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