I have a cyberpower 1030HT, which has a 6000 joule rating. http://reviews.cnet.com/power-equipment/cyberpower-10-outlet-home/4507-3055_7-31746650.html?tag=mncol;rnav (specs) I am planning on buying a 10,000 BTU AC unit. I have a 40 inch samsung LED TV, cable box, Wii, Xbox and blue ray player hooked up to it right now. I want to protect the unit from any voltage spikes due to brown outs, since its common in the summer when grids are at their peek use. Would it be safe to do?