Need a wiring diagram for a GDL20kcsbs...

Question

I am on (limited) off grid solar power. This refrigerator decides every night to run the defrost heater. I would like to put in a switch or timer to override the heater so thatit can only come on when there is some sun around, not in the middle ofthe night draining the batteries.Where can I find a wiring diagram for this refrigerator? Thanks!