exhaust venting solar shed with 48v 5 inch fan

I can't tell you to try it but if it were me, I would find something on the order of a single pole electric baseboard heater thermostat, ether a unit mount or wall mount, and try that. But only if it was really cheap or better yet, free. As you may already now, the bi-metal type thermostats just make or brake a circuit. A problem that may or may not happen at 48 vdc, I don't know because I never tried it, might be that the contacts weld together and then you'll be right back where you started with the fan running all the time. Also the temperature range might not go high enough for you. Typically they are from 50F to 80F.

 hi eric,

 pickins' sure are slim in the 48 vdc thermostat department.

 this would fall into the same category of "i can't reccomend you do this but if it were me" advice.

 you may still be able to get your hands on one of those old mercury bulb thermostats to do the trick. i bet with such low currents you would be good just off the mercury switch contacts without any relay. many of those "honeywell" style thermostats had a hot/cold lever to change from a normally open to a normally closed switch. or you might be able to change the mounting position of the unit on the wall to change it from n/o to n/c.

 with any solution you come up with we should mention putting a small fuse in line here at the battery output to  keep things safe.

best regards, dave