Hey Tony, thanks for the important battery issue as a safety precaution. :-) I'd like to add some general safety tips: - electricity is dangerious and KILLS. Get a skilled professional to do the wiring and setup or risk frying your equipment - When designing such, do not load with any device that has capacitiance, inductance loads eg a motor drive - Use sequential startup to devices as you do not want to create a load surge on the batteries. - Safety first. Wherever possible, including inputs and outputs add in-line fuses on DC /circuit breakers on AC lines to prevent risk of fire or shock or accidental shortcircuits - Use correct cabling and terminators. Eg on DC side from batteries to invertor/ups, always use heavy duty flame retardent cables. connectors should be anti-corrosive and covered with Gel to prevent moisture buildup. - ALL outlets must be clearly marked as BACKUP supply ( DC or AC ) - if you have kids, ensure the entire system is raised a few feet above ground and locked securely. Pls add/correct as needed.