I have several 12 vdc exhaust fans in my Mobile Homes ceiling. Instead of turning each of these on/off individually I was looking for a possible circuit that could turn these fans on/off for a predetermined time (ie. 15-30 mins) but only when inside temperature reached around 80°F and then reset itself for a new cycle, until temp has dropped below the set temp of 80°F. Can anyone help me?
Reason I asked is I have used used home heating/cooling thermostats I bought at Habitat For Humanity thrift store for $1 for a similar project. However, they operate on 24VAC; work fine on AC Wall-Wart.
I have thought of using a thermostat as the temp sensing section of what I need, but as you said, they operate off of 24vac....and even 120vac is scarce as all my 120vac comes from an inverter off of solar panels