Chicken Coop control box with 12v relays for actuators

Hey guys,

I'm looking to switch from using cheap programable timers (they always seem to lose time) to an Arduino based system. And just how much work there is involved, or if I (as a beginner) should use a RPi instead.

Would I be better off swapping to 5V relays? Have some basic understanding of electronics but this is getting just beyond my knowledge.

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My current set up is this: https://i.imgur.com/hnAskVi.png

Running on a 100AH deep cycle.

Actuator specs: https://i.imgur.com/Rqyi4ZN.png

Relay specs: https://i.imgur.com/PpCgsIR.png