Home made power supply.

[michaelmrc]

wouldnt it be simpler and more cost effective just to run a dc - dc converter?

[robert644]

The compressor runs on 15-25 VAC

[goboatingnow]

Where did the thermistors enter the fray. What are they for

Dave


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[nimblemotors]

A google of this model shows the power at
DE-461 1.3 5.0-2.5

1.3 amps at 120vac or 5amps at 12vdc or 2.5 amps at 24vdc
That AC and DC doesn't really add-up,
the question is how many amps at 20vac?
120vac to 24vac transformers are common for outdoor sprinkler systems.
Here is a 10amp unit for $30, 24V, 10A Center Tapped (12-0-12) Transformer | MPJA.COM

A simple relay will turn it on/off, use 12v to turn it on off.
Here is one rated 20amps $6
12VDC DPDT 20A Aromat Relay | MPJA.COM

Thermistors are used essentially as a resetable fuse, they cutoff when too hot.
I think maybe you are thinking of a temperature sensor to turn on/off the fridge based on the fridge temp right?

I just built a controller for the refridgerator in my soda machine,
I replaced all the analog controls with a microprocessor that has a LM34 temp sensor,
and used a solid state relay that is controlled by only 3v output from the micro,
this $10 6amp unit.
http://www.jameco.com/webapp/wcs/sto...0001_176698_-1


hope that helps.

[hellosailor]

"That AC and DC doesn't really add-up, "
Probably a conversion loss, or loss from a dump regulator on the way to DC.