[RE-wrenches] Battery idle losses; Sunny Island overhead

[Drake]

I calculate that my pair of AC coupled, stacked Outbacks will use 
just under a kWh/ day in idle losses.  When the inverters are feeding 
small loads (as they usually are) high inefficiency should at least 
equal idle losses.




At 08:24 PM 11/2/2011, you wrote:
>Hi Jeff,
>
>1500Wh? That's a 62 watt loss 24/7. That is surprising as it's more 
>than twice what the manufacturer claims; 25 watt with no load or 
>0.6kWh daily.  However, as loads come on the idle losses quickly 
>diminish as they are overtaken by the load. I have not done any SI 
>jobs but that number, 1.5kWh, concerns me.
>
>Larry Crutcher
>Starlight Solar Power Systems
>
>
>On Nov 2, 2011, at 4:42 PM, Jeff Irish wrote:
>
> > William,
> >
> > I did a 2 year long study on a Sunny Island 5048 grid-intertie 
> battery back-up system and found the SI and batteries used about 
> 1.5kWh per day in "overhead".  The batteries were 8 Concorde AGMs 
> 212Ah C20.  Hope that helps.
> >
> > Jeff Irish, PE
> > President
> > Hudson Valley Clean Energy, Inc.
> > and Adirondack Solar
> > 13 Hook Road
> > Rhinebeck, NY 12572
> > T.845.876.3767x110
> > F.845.876.3912
> > jeff at hvce.com
> > Renewable Energy Systems
> > Solar, Wind, Geothermal
> > NYSERDA Eligible PV Installer
> > NABCEP Certified PV Installer
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Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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