I'm looking for a brand and model recommendation of an ATS that will function with a 200 amp master panel and two 6 kw Sunny Island battery invertors (12kw) with 30 kwhr LIFEPH battery bank and 9 kw solar. Generac and others don't seem to relate to battery backup, only their own generators or battery packs. It would have to programable to provide the 5 second delay on switchover as required by SMA. Certainly some one out there has conquered this problem. If all else fails, I'll go with a manual switch, but would prefer automatic if I can configure it.