Hello from Sweden! Have just added my second 30kWh batterypack and balancing right now. Growatt spf3500 11 Trina Vertex 390w panels Batrium Watchmon Core 12 Cellmate K9 Two Nissan Leaf 30kWh battery packs Alot of circut breakers, trippers, fuses and cables. Getting a bigger inverter next year, everything was sold out here in Sweden when i started this. Adding 10 more panels too. Took me four months to build, and its a off-grid system that power my house. Cost about 100k Sek so far. Still have grid, buying at nights when the price is low if i dont get any sun in a week. Live in Sweden so here is daaark nov-feb. Hope you enjoy