Originally Posted by
HUON
Replaced two cells (2 volt batteries) a few days ago, they were about 15 years old. the folk that supplied them said they're selling gel batteries now. While we were getting them into position we started talking about the latest and greatest in battery storage, I mentioned Tesla , I quickly found out that they weren't suited to stand alone systems like ours. It was pointed out that most of the battery technology these days were aimed at returning excess power to the grid (which is not a bad thing).
There is a new lead acid battery, developed by CSIRO, sold by ecolt (suspect spelling), it runs at it's best between 30 and 90 %.