What you are missing is MOSFET drivers. The Arduino pins can only deliver 20-40mA to charge and discharge the MOSFET gates. This is important to switch quickly and not waste a lot of power during every PWM cycle.
Hi! For a project I am designing a system of very high-power electromagnets. Each electromagnet is fed a current of around 75A. To allow them to cool, I alternate between feeding power between one and the other around every 10 seconds or so.
Has something changed since?
My understanding of the OP is that PWM was never even a consideration.
Be careful of MOSFET current specs. The quoted rating is generally a pulse rating.
There really is no major problem with this setup.
a big relay may be more appropriate. Much less likely to emit expensive magic smoke.
Any thoughts on the use of mosfets Paul, or a good suggestion on mouser? I'm trying to figure this out soon.