solid state relay question, please help!

Are you using an STC-1000 thermostat?

If so, it lists it's internal relays at:

8. Relay contact capacity: Cool 10A/250VAC;Heat 10A/250VAC;

Not sure a secondary relay would be required.
 
In reading I didn't find where it states how much current the relay in the temperature control can handle. It may be able to handle the heating directly. --- If not, then you will need a DC power supply to drive the solid state relay with. This can be a simple prong mounted power supply putting out low voltage DC. Be careful here however, as some that say they put out DC actually put out 120 hertz pulsating DC and may not drive the solid state relay properly. In this case you would need a capacitor across the supply to provide purer DC. (I use a solid state relay to drive my incubator with, however I made my own complete system and thus had a low voltage signal available that I could drive the relay with. The hysteresis on the system is about one tenth of one degree. Works great )
 
my best advice - stay away from digital it always fails at the worst possible moment. to much accuracy will also cause weak chicks. I myself am partial to wafer thermostats they are pretty accurate and hardly ever break down. I do keep an extra one on hand just in case, but its more insurance since I hatch other people's eggs too.

you don't need the best in temperature controls, a degree of variance is usually fine.

keep in mind a hen does not have a thermometer, a hygrometer, or a wristwatch. ive never seen one write on a calendar either.

another thing to think about- ancient Egyptians hatched eggs in cave like structures, heated by open fire. they more than likely controlled the temperature by "feel".
 

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