I'm currently working on a delta printer. I've calculated that I would need about 135W for the heated bed to heat at 110°C in 180 sec. I've looked at the PCB layout and it seems to have a 11A mosfet PWM, but I'm not sure at all if this is related to the heated bed. What is the maximum wattage we can get from a 12V system? If the RUMBA can't provide enough power, what is the alternative?