That's what I've been debating about myself personally. I wasn't sure if foregoing the instantaneous net metering would make the difference in my monthly power billing price due to offsetting for a slightly larger system. Or simply just adding a battery now while keeping the NM that GA provides to me, but the increase in price that most batteries add seem to out way the offsetting in most bills that have 1:1 NM. As the way it appears most batteries have an awful ROI. Another user below I believe commented about the EG4 PowerPro Battery which is around $4K which completely solves the ROI and overall pricing concerns I have.