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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?

I just bought an EG4 6000XP. A local guy that sells solar equipment as a side business has 2: EG4 LifePower4 Version 1 Batteries. They are new in the box. He’s asking $1000 each, cash without tax. This would result in a savings of about $400 per battery versus buying 2 new EG4 LifePower4 Version...