I suggest getting an older style computer adapter (pre-USB C). They are usually 50 or 60 Watts and sometimes 12 volt (24V versions are also available). For example, we used this one: https://www.mouser.com/ProductDetail/108-ADP-66CRBE to supply power for a small heating pad control system at work. You will need a 120V computer power cord such as: https://www.mouser.com/ProductDetail/552-AC30UNA-R and you might want get a mating 2.5 mm DC connector for the other end (or you can just cut the cable and strip the wires): https://www.mouser.com/ProductDetail/490-PJ-005B
Nathan Post S/V Wisper C&C 34 CB Lynn, MA
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