Your theatrical limit is 11A at 120V that's about 120W that a heater can consume, if you get a heater that draws more power it will kill your MOSFETs. The first consideration is the MOSFET of your board. There are many factors when considering if a heatbed will work with your RAMPS board or if your heatbed will destroy your board. This board is mainly a 12V board and can be modified to work at 24V. This does add another set of steps to assembly, but we stuck with larger sizes to make it fairly painless. In RAMPS 1.4, the resistors and capacitors are now surface mount to fit more passive components. In RAMPS 1.4 the capacitors and resistors are now surface mount (SMD) which provided more space for other passive components and headers. 6 Hacking (archived information and notes).5.3.1 Other production boards found in the wild.5.1 The Heat Bed Mosfet gets TOO HOT!!!.2.7.2 Power Supply, Details and Considerations.2.7.1.1 Power for the Arduino Mega board.
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