Ok guys, I got it hooked up, and with a 350 W ATX power supply, this baby is pulling 12 Amps, and heat to 90 °C in about 10 min.
My setup is just the heat pad on the bottom of the aluminium plate and a mirror on top, with no insulation on bottom, so I'm guessing it could be faster than that if I put some insulation...
The really cool thing, it is a straight forward install. I just had to relay the power, and bring another line from the power supply for it. But the heat pad does stick on the bottom of the bed directly, no dimensions issues, except the holes alittle off, but you can see the tracks and cut the silicon with a hobby knife to make them match. there's a lot of meat around the holes to do so.
I had to remove all the old glue, and I did sand the aluminium plate so surface will be as flat as possible with a 600 Grit.
The cable is good quality, and the thermistor looks like giving reliable information.
I attach a picture of my electrical install, very basic, but works great.
PS, i forgot to say, that my printer is totaly enclosed in a 1/2 inch plywood enclosure. That help the heat time a lot !
My old heat pad original solidoodle was getting to 90 °c in about 40 min. So for me it's a huge improvement.
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SD3, early 2013. Silicon 200W 8x8 heater bed, lawsy carriage on 8 mm hardened chrome shafts, E3D V6 and lawsy MK5 extruder, ATX 350 W PSU, Custom build plywood enclosure, azteeg x5 mini smothie firmware, with vikki 2 screen, fishing line conversion and pulley conversion, M5 Z rod. Calling it Gran'ma, going strong ! <3