Those of you coming across this. I spoke to EG4 on the phone, they just say you can't hook up 6 Lifepower4 with 1 powerpro due to "sever" balancing issues. I am now asking Signature Solar to exchange three of my Lifepower4's (unopened in the box) for another Powerpro as I cannot use them... EG4 also says I need a firmware update on the LifePower4's to use them with the Powerpro, they are mailing me some sort of update tool.