thats about what I got when I tested the 7kd in my comp car I got around 6k, this is why I liked the zenon 7k board better 12v-18volts out of the box. The stetsom was down a few tenths compared to the Atomic and the Stetsom was burped first, bat charged burped with the Atomic with the my 12volt comp car. The Atomic was a bit more efficient (could run 2 amps strapped on one battery) where im not sure I could of ran 2 stetsoms on one battery since I only had one Stetsom to test in my application. Again this was with a modded stetsom 7kd just around when they first came out so take this information with a grain of salt im sure stetsom made some improvements.