Using Arduino to control a high voltage DC device
Batteries are going to be annoying because they're run out and have to be recharged/replaced. A mains power supply would be easier to &quot;set and forget.
I did a google search on &quot;36V DC power supply&quot; and found a 4A power supply from &quot;Alitove&quot; on Amazon for $22.99 US. That should be fine. (Assuming you are somewhere with 120VAC mains power. If you live somewhere with 240VAC mains power you would need a different unit, but since I found one, I would expect a google search in your region would find one for your area.)
I would suggest using a logic-level MOSFET transistor + flyback diode to switch your DC power. That's easier to do than a relay (That would require another power supply.)