I am building the small system that Will Prowse says only 30 minutes to assemble. The basic components are an Eg4 3000 EHV-48v Inverter/Charger and an Eg4 LifePower4 V2 Lithium Battery = 48V 100AH. What I want to do is add 3 12v 150 AH Lithium batteries that I have on hand. How can I do this?