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Old 05-02-2012, 05:58 PM   #1
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should I buy these generac generators for 100. each?


found a crazy deal today as im a 'picker' and have been doing this since before it was a tv show. heres what i found, generac backup generators that the output is 90 volts of DC current. they run on nat gas or propane via a switch. my question is how can i use these generators to run stuff on my catering mobile taco/food truck or backup power for my house? i need AC current and according to literature on the web, the generators are 14kw and some are single phase and some are 3 ph. i know that i can just drop a leg on 3 phase to get single ph. but how to get ac i dont know.

im guessing the engines would be kewl on a go cart and use a propane tank for a gas tank, right? any help on elec conversion would be appreciated.

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Old 05-02-2012, 06:23 PM   #2
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should I buy these generac generators for 100. each?


You need additional electrical know how and additional components to make heads or tails, correction make 120 volts or 240 volts AC out of 90 volts DC.

By the way there is no such thing as 3 phase DC, although DC does come in different qualities such as pure versus pulsating (unfiltered rectified AC).

Common consumer grade DC to AC converters (inverters) take 12 volts DC to create 120 volts AC. YOu cannot simply take one of those and hook it up to the 90 volt DC generator output.

Those generators had some specialized purpose. On board an airplane? On board a ship or yacht? Railway signaling?

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Old 05-02-2012, 07:06 PM   #3
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should I buy these generac generators for 100. each?


they were used by a cable company to run some transformers or ?? should i buy them or how much would it cost to convert them? im guessing the motors are worth 100.00 for a go cart but really need a cpl of generators.

it did say 3 ph on some and single ph on other data tags
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Old 05-02-2012, 07:28 PM   #4
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should I buy these generac generators for 100. each?


I would see if you can get more information on these and make sure they are a voltage you can use before you buy them. They may also have many hours of use on them.

Best thing would be to post pictures of the tags and post them here.
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Old 05-03-2012, 05:10 AM   #5
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should I buy these generac generators for 100. each?


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Originally Posted by vintagecarlover View Post
they were used by a cable company to run some transformers or ??
it did say 3 ph on some and single ph on other data tags
Transformers dont run on DC !
They only work on AC !

I have never seen a three phase DC genny !
Unless it is a three phase AC alternator with built in rectifiers
to provide a DC output.

If so, you might be able to tap off before the rectifiers
and get AC.

You need to do some investigation.
perhaps search online for specifications.

Or post pictures of the name plates with the spec's.
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Old 05-03-2012, 07:57 AM   #6
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should I buy these generac generators for 100. each?


As for the electrical portion I would follow the previous recommendations, as for the running those engines on propane, if they were originally rigged for NG, you will have purchase a conversion kit for that as well.

NG has a approximatly 1/3 of the btu's/ft3 as propane, so a suitably sized regulator and orfice would have to be used to convert to propane.

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Old 05-03-2012, 08:27 AM   #7
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should I buy these generac generators for 100. each?


I doubt it is a DC generator they are inefficient to make so almost all create AC power and convert it to DC. Many times they do both. Some of the telco backup systems have UPS built in or directly run on DC but it is mostly 48 volts.

Unless you see it stated that it outputs 240/120 volts it is not going to be real useful. You will find that a lot of 3 phase power runs voltages like 208 or 277. Changing these voltages is much tougher than just the phase issue.
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Old 05-03-2012, 09:36 AM   #8
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should I buy these generac generators for 100. each?


Quote:
Originally Posted by vintagecarlover View Post
found a crazy deal today
Why don't you post a link so we can see what you've found.

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