On Feb 17, 5:23*pm, wrote:
On Thu, 17 Feb 2011 09:35:07 -0800 (PST), jamesgangnc





wrote:
On Feb 17, 10:41*am, Tegger wrote:
jamesgangnc 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.