I'm looking into upgrading my heated bed and replacing it with a silicone bed. I know nearly nothing about electronics, so I would like someone more knowledgeable to confirm if what I have theorized is correct or I'm going to burn my house down trying it.
I did some basic math following Tom's guide, if that is correct, I would be pulling 16 A current. Assuming I plug the heatbed directly to the ramps, that would mean the MOSFETs are losing approximately (considering 20 % more resistance than the datasheet says as per Tom's advice) about 1.2 W, which means the MOSFET would heat up about 100 °C above room temperature, so the total temp would be around 125 °C, which is below the graded 150 °C in the sheet.
According to this math, I'm thinking I can just plug that heater to my RAMPS board without any issues. Should this cause any issues? Will it set a fire or melt down something? Anything else I should consider?