I really like the idea of a well designed, and open, scalable home power solution with grid integration. My thought for you; battery technology is going to keep

I really like the idea of a well designed, and open, scalable home power solution with grid integration. My thought for you; battery technology is going to keep changing, so design-in that variability for the long term. Ideally one should be to able to hook-up a mixed bag of various cells, lead-acids, fuel-cells, lithium... in varying capacities and conditions and have the management system look after them all.