Being somewhat new to RE design and installation I would like to ask for some input on PV costs for  graduate research I am conducting on PV lifecycle costs. Can anyone give me a reasonable estimate on the lifespan of flooded batteries (assuming proper maintenance)? How about deep cycle sealed batteries (i.e. Douglas, Concorde)? The system I am designing for this analysis will most likely have a small battery bank kept at float for backup when the grid goes down. I would also appreciate any estimates on yearly operation and maintenance costs for a 2.5- 3 KW system. Thanks.
Travis Thompson
trav_t@yahoo.com
Graduate Student
Building Science & Appropriate Technology
Appalachian State University, Boone, NC
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