cost per kWh [RE-wrenches]

[Joel Davidson]

I am monitoring my SW4048 system with a Brand meter. Float charge input from the
grid has been averaging around 250 watt-hours per month (much less than I
thought). My 4 each 12-volt 86 AH Johnson Controls sealed batteries just sit there
waiting for power outages and there have been no outages for the past year.

"Todd Cory, Mt. Shasta Energy Services" wrote:

> Thanks Bill. I would have thought the SW would be far worse in conversion
> efficiency, so it is that stupid battery floating all night that really is the
> problem. I imagine Outback will be the ones to finally make a grid tie machine
> that is smart enough to know when it is not needed. 45 to 50 watts continual
> overhead is significant, especially during those dark winter months when the
> PV's don't even generate that much.
>
> Todd
>
> Bill Brooks wrote:
>
> > Todd,
> > Night-time losses for the SW are measured at a continuous 40-45 Watts. The
> > SB is one big donut (no losses) at night.
>
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