I am looking at purchasing two used Valence U-Charge RT Series U1-12RT LifePo4 12V 40Ah 512wh batteries (connected in parallel to get 12V 80ah). I currently own a Zamp Solar USP1003 180-Watt Folding Portable Solar System that includes a 5 stage 15 amp digital controller. Can someone recommend the proper inverter for this system? I plan to charge a Macbook Pro so I read a pure sine wave inverter is recommended. I am considering the Giandel Pure Sine Wave 1200 W inverter but don't know if the additional wattage would have negative impact. Please pass on any other issues you may see with this configuration. I am new at this and on tight budget. While I am open to less expensive batteries, this system will be inside a tent so I have to consider the health concerns with other options.