I'm very aware and conscious of the power usage being much bigger. I know plenty of other that has done this with this bed and SSRs ( http://sublimelayers.blogspot.no/2015/12/my-current-rostock-max-ultimate.html for example) and my power supply has overload protection and should be more than enough for even 24V (700W, calculated power draw should be around 510w if my multimeter is correct, running at full capacity).
I will try and see if the lag in the temperature can be fixed before i do anything else.