On Feb 17, 3:08*pm, Art Todesco wrote:
On 2/17/2011 12:35 PM, jamesgangnc wrote:



On Feb 17, 10:41 am, *wrote:
*wrote :

I assume the smaller
ones keep costs and heat down by not running the power through a power
supply and inverter 100% of the time. *Thus they have to switch
sources.

Correct. They feed line-voltage until that voltage fails to meet certain
pre-defined criteria. At that point the battery/inverter is switched-in.