That’s terrible! My 9"x9" is 540 watt, this is one of the low power ones.
Mmm need create frist hammaster generator , nice to know but need connect ralay 12v 110-220v on hotbed connetor
I found the guys in China that supply QU-BD, they will do any size any voltage. I stuck to 20amp 12v as 230v and a relay was too much hassle and I’ve got a nipper about so I didn’t want that kind of voltage on internal wiring.
Oh and a 300x300 12v cost $45 including shipping out of China.
@Tim_Rastall surely they have a minimum order quantity though? Happen to know what it is? I need a replacement for my printer, but can’t be bothered to spend the $55 for one from McMaster.
@Tim_Rastall Got a link?
@ThantiK Never underestimate the power of cheap stuff from China.
Use the ‘Chat Now’ feature and tell them what dimensions etc you want - now I go back and look, mine worked out to be $38 including shipping. That includes a built in thermistor.
http://www.aliexpress.com/store/product/Silicone-Heater-Bed-For-3D-Printer-Heating/709519_1343874077.html
I just ordered one, 150x150. $ 17.60 including shipping.
mm…150x150 is not 600x600 
Not
With beds that large, you’d get a huge power consumption advantage by breaking it down into smaller, individually-controllable sub-areas.
I’ve even split the controls for each half of my 400x200 build area so that the printer just needs to heat up one half for smaller prints.
if search some seller can insert temp sensor too…
I suggest to use kapton heater…same silicon but minor weight (lower cost too)
http://www.aliexpress.com/wholesale?SearchText=%09+Kapton&initiative_id=SB_20130924015630
@Mauro_Manco I didn’t see any 120vac heaters in kapton. I’m thinking it’s not rates for that type of voltage isolation. I have a kapton heater now, nice and low profile. I’ve had to peel it off twice. The heating elements got bent a bit, but works well. It’s not easy to peel, so make site your thermistor works and is in a good position… And the leads are insulated before sticking it to your bed. I thought I’d break the heater when peeling but it’s pretty durable.
@Tim_Rastall is that shipping right on the aliexpress page? It says over $20 for shipping. Did you get then to lower it?
@Eric_Moy Yep. Always worth clicking chat now to see what they can do shipping wise - there is often a cheaper option.
I love you guys; as far as tips for ordering cheap chinese stuff you guys are full of awesome hints!
Wow, I had no idea those heated beds drew so much. I thought they were just little 80 watt warming plates. Is that 540 watts the whole time, or just at startup? I’m off-grid. A 10+ hour print at that rate would equal a whole day of solar here in the winter 
@Chet_Wyatt , the PCB based heaters aren’t like the setup I use. I use a 110v, 540watt heater pad. It only uses that much energy to initially heat; the reason I use such a strong setup is because I print in ABS a lot. My heated bed can pump out 200C+ without struggling, whereas the PCB heat beds struggle to even reach 120C and are on most of the time in order to maintain it. I have to have a little bit of extra electronics in order to switch the high voltage loads though (a 20A 110v solid state relay which is opto-isolated from the logic voltage)