I have an idea for a gasoline powerd fridge, need input.

AI Thread Summary
The discussion revolves around a concept for a gasoline-powered fridge utilizing a 5HP engine with an electric starter, designed to activate automatically via a coil thermostat and relays. The proposed system includes safety features like a thermistor to prevent the starter motor from overheating and a kill switch for the engine. Participants emphasize the importance of using the device outdoors due to the dangers of carbon monoxide from gas engines. There are suggestions for additional safety measures, such as incorporating a second thermostat to control the entire circuit. Overall, the idea presents an innovative approach to refrigeration but raises significant safety concerns.
masshuku
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So last night, a bit on the tipsy side, I drew this on paper(then in paint) and I don't see why It would not work. I'm not really an engineer so I'm not sure if there's some flaw in my logic.
The idea is based on a 5HP engine with an electric starter. It automatically starts the engine using a coil thermostat and some relays.
If people think it will work, ill go try to find the parts and stuff needed for cheap/free and build it.

I know a picture is worth a thousand words.
http://img215.imageshack.us/img215/3784/ideag.png


The symbols and such are sort of just off the top of my head, apart from 1 I got from wikipedia.

Basic rundown of how a startup occurs:

Thermostat gap closes, begins to power 2 relays. The first opens a kill switch(or closes it depending on how the engine operates) and the second powers the exciter on the alternator.

The current then runs through a third relay and into the starter solenoid, passing through a thermistor(to kill the starter motor if it runs to long, aka the thermistor warms up to much)

After the engine starts the output is run through 2 diodes, one goes back to the battery and the other goes to that third relay to cut power to the starter.


I could attach a second thermostat to the thermistor so that it kills the entire circuit until the thermistor cools down.
 
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Sure, you could make a thermostat controlled start of a gas engine. But not the way you said.

But this is for outdoor use only, correct? Gas engines indoors are deadly.
 
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