What I'd like to see is an ability for me to provide a list of appliances that I tend to use in my house (makes/models) along with a "typical" use pattern like "washer, dryer, dishwasher, fridge, freezer, stove, 50" TV, 200W sound system and blu-ray player or cable box frequently get used at the same time" With a usage pattern like that, which of the two batteries would be most useful? would I need multiples wired in series or parallel? is that possible? how long would it last under a load like that? My target is for off-grid use, so ROI isn't as big a concern to me as longevity of power and charging requirements from off-grid power generation.