Pretty cool. I'd love to get into solar DIY but it seems pretty daunting. I moved in to a place recently with an (apparently very old) 7kW rooftop solar system

Pretty cool. I'd love to get into solar DIY but it seems pretty daunting. I moved in to a place recently with an (apparently very old) 7kW rooftop solar system without a battery, and I called the original installer to talk about what my options are if I wanted to expand it, either adding more watts or adding a battery. The overall take-away from talking to the installer was that it wasn't worth it because my existing system uses some different, older technology, and that making any substantial improvements to it would change my "NEM" whatever that means. The way I understand it, it would move me into some other, more expensive regulatory regime. I don't know--my head was spinning after the conversation, and I was basically convinced to just ignore the system I have and not touch it.