Warren, you are right memory was not the right term, my point was simply that normal 12v car batteries are no good long term. As to cost, I bow to your knowledge, I am only used to dealing with larger systems such as will keep the control systems of a power station running (usually at 110v dc - there is no invertor only a charger). these systems would chew up and spit out a normal ups. 8)
The local networks, ouch! kick me in the privates, I work as a faultman for networks south which is the management company for alpine energy(was south canterbury electric power board) and think we do all right by people in the area. alpine energy is 40% owned by a trust which returns dividends to the consumer, 47% owned by the timaru district council, dividends are used to run the town. alpine has for many years been shifting existing overhead cabling to underground systems which are more reliable and less obtrusive, this work continues making in theory timaru a better place to live. (cant comment on other powerboards though)
sorry to bleat on and I know its off topic but i felt like it.
Mark