January 13 Retrofitting Grid Tied Systems With Battery Backup 3 Minute Video Tags: backup, battery, grid, minute, retrofitting, systems, tied, video Posted January 13, 2016 by admin in category retrofitting Post navigation SUN-600G 600W Watt Micro Grid Tie Solar Power Inverter Solar Panel 120V AC NEW 400 Watt Grid Tie Inverter for Solar Panel Wind Turbine