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
> [email protected]
> Renewable Energy Systems
> Solar, Wind, Geothermal
> NYSERDA Eligible PV Installer
> NABCEP Certified PV Installer
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