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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14489
Experience:  Certified on Onan and Generac generators
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How to wire a Onan 20 ES generator to 12o 240 Single phase

Customer Question

How to wire a Onan 20 ES generator to 12o 240 Single phase zigzag delta
Submitted: 8 months ago.
Category: Small Engine
Customer: replied 8 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Hank F. replied 8 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

What is the full model number of the genset?

What is the voltage code on the data plate?

Customer: replied 8 months ago.
Model no 20ES spec 57312f wiring diagram(###) ###-####01(###) ###-####01. Hz 60 pf 0.8. 1ph.13. 3.ph 20 kw
Expert:  Hank F. replied 8 months ago.

There should be more to the model number than that. I need the whole thing.

Also, on the data plate there should be a voltage code.

Customer: replied 8 months ago.
model # ***** serial #D920463726, Spec #57312F,Service Rating: Standby
HZ: 60. RPM. 1800
PF: 0.8. BAT: 12
1PH KW. 13. KVA: 13
3PH KW: 20. KVA: 25GPH Volts. AMPS
120/208. 69
120/240. 60
127/220. 66
139/240. 60
240/416. 35
254/440. 33
277/480. 301PH Volts
120/240. 54
If you have an email address I can send pictures, thank you
Expert:  Hank F. replied 8 months ago.

That additional info tells me you have a 12 lead stator, and not a 4 lead stator.

I have uploaded the reconnection diagram for you.

Click here to download it.

Expert:  Hank F. replied 8 months ago.

Did you get the reconnection diagram?