Aussie article on battery back up options
http://reneweconomy.com.au/battery-...-2-beaten-even-before-first-deliveries-44252/
http://reneweconomy.com.au/battery-...-2-beaten-even-before-first-deliveries-44252/
The amount of choices, large and small are listed here on this site. Quite a selection actually. The ampetus super lithium looks quite compact.I just wish this technology was available small enough to for home use http://www.viznenergy.com/microgrid/.
I would be bit worried about bolting power dense lithium batteries that on occasion are known to burst into flames purchased on the least cost basis into my basement. It probably is coming down to that the Chinese government wants to buy this market and they will do whatever they have to sell batteries below any other competitor.
And also the salt water battery: http://aquionenergy.com/