VILASMAN
I may be replacing a 20 kw generator and transfer switch from the mid 1990s in a couple of weeks. The only thing I know about it is that the motor is made by fiat. What I want to know is some idea of what the model number could so be, so I can look up the specs. I want to see if I can do a direct replacement with a more modern generator and whether I will need to change out the transfer switch. That would tell me whether I would need to add wiring.

Anyone have any ideas on how I would track this down?
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ceb58
VILASMAN;8324 wrote:
I may be replacing a 20 kw generator and transfer switch from the mid 1990s in a couple of weeks. The only thing I know about it is that the motor is made by fiat. What I want to know is some idea of what the model number could so be, so I can look up the specs. I want to see if I can do a direct replacement with a more modern generator and whether I will need to change out the transfer switch. That would tell me whether I would need to add wiring.

Anyone have any ideas on how I would track this down?


If you are replacing the gen. the old one would not matter. What matters is what size (amp rating) is the TS, model # and which gen. you plan on getting and what size.
If you replace it with a 20kw your feeder wire from the gen. to the switch should not change. It is sized to the breaker size on the generator.
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VILASMAN
while I am replacing the unit... the old one has to be disposed of. I am thinking that it will be disposed of, into my cousin's garage. He is a boiler engineer and auto mechanic...
I just want to know a little bit more about it so that I can determine whether it is worth the trouble to try and fix it or install another prime mover (motor) in it to make it work
The current generator is a 20kw with a 100 amp circuit breaker and a 20kw with a 100 amp breaker is going back. I think the current generator is a 5336 or a 5337
Also... I think I have figured out which transfer switch is installed with it. I am currently installing a 20 kw guardian with a nexus smart switch. In the guardian there is wire from the transfer switch that trickle charges the battery and I dont see a place to connect that wire in the old transfer switch.
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Skip Douglas SkipD
VILASMAN;8330 wrote:
Also... I think I have figured out which transfer switch is installed with it. I am currently installing a 20 kw guardian with a nexus smart switch. In the guardian there is wire from the transfer switch that trickle charges the battery and I dont see a place to connect that wire in the old transfer switch.
What transfer switch do you have?

How is the wiring between the transfer switch and the generator installed - via conduit installed by an electrician or using a pre-wired "whip" from Generac?
Skip Douglas
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VILASMAN
I believe the transfer switch is either 4678 or 9227. I also believe that it is not the generac whip but electrician installed conduit. I hope it is installed after the meter but before the panel.
I havent seen it yet and the company I am working with mainly does solar panel installs, so they dont quite know what to look for.
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Skip Douglas SkipD
VILASMAN;8332 wrote:
I believe the transfer switch is either 4678 or 9227. I also believe that it is not the generac whip but electrician installed conduit. I hope it is installed after the meter but before the panel.
I havent seen it yet and the company I am working with mainly does solar panel installs, so they dont quite know what to look for.
Ahhh. I thought you were going to replace YOUR generator.

If the original transfer switch is in good condition (and I would disassemble and inspect the switching contactor internally), and if it is wired with conduit, then you should be able to run any extra wiring you may need for the charger.

Assuming that the existing conduit could be easily fitted up to a new transfer switch, it's quite possible that replacing the whole shebang with new equipment would be the best way to go. There would be no "cobbling together" of anything. The inspector would be happier because everything would match the Generac installation manual. Most of all, any wear and tear of the old transfer switch would be gone.
Skip Douglas
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VILASMAN
I agree with you... I just know that on the new nexus transfer switch there is a particular screw on the buss block that the wire that feeds the trickle charge circuit on the 20kw. It seems to be just a 120v ac tap... and I guess i could tap a wire under one of the set screws on the line side of the transfer switch and it would serve the same purpose... I would have to fuse it to 5amps...
but the new transfer switch is the cleaner option.
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jmct
It looks like the 20kW you are looking at is a similar model to the 1998 15kW from my "SG015 not producing voltage" thread. Mine has the Fiat motor as well, and I have been able to find some manuals for it but I still can't find a wiring diagram for the generator controls.

[url]http://www.generator-parts.com/manuals/home-standby/0A1368.pdf[/url]
[url]http://www.generator-parts.com/manuals/home-standby/PB16000G.pdf[/url]
[url]http://www.generator-parts.com/manuals/home-standby/0A7218.pdf[/url]

My 15kw also came with a transfer switch. I was not going to use it since mine is an off-grid application, so I've been stealing connectors off it, but the switching contacts are probably in decent shape. The entire unit only has 220 hours on it, and it's previous life was on a radio tower so I don't think the transfer switch was actuated very often. I'd be happy to trade the xfer switch for all of your control boards (if you decide to trash the unit), since that seems to be the source of my problems.

Let me know if you need more information. I'm happy to share what little I have been able to dig up.
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douglas123
If you still need info on these units let me know. Generac has obsoleted this engine and has no more tune up parts. I am still looking for a suitable replacement rotor button. Found one in russia did not buy. not a big fan of the ford fiat italian engine. from personal experience the engine did not hold up under demanding condions say after 1500 run time hours. like the 1.5 mitz and surely miss the 1.2 nissan. No comment yet on the new 1.6 CHERI
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