I would buy a 20 amp breaker and run #12 wire in 3/4 conduit under ground out to your tortoise house . If you dig the ditch then call me I will go help you run the power .
Is 20amp big enough for two tortoise houses? I'm setting up my Redfoot enclosure and want to put an outlet out there too on the same circuit
0.0.1 Redfoot (Spike)
0.0.1 Cherryhead Redfoot (Bruce Wayne)
1.0 Sulcata (Hal Jordan)