Battery vs no Battery grid tie systems - efficiency [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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I don't know about Brand X, but I have heard from the folks at Outback that their grid tied, battery based systems are comparable to sunny boys in conversion efficiency. The caveat is what kind and how many a/h the battery bank is as large, lead antimony wet cell banks would eat some of the power up.

I am sure the Outback guys can document this.

Todd



Warren Lauzon wrote:

> Does anyone have any real world information on the overall system efficiency of a battery based grid tie system, with backup (such as using Xantrex SWP inverters), vs straight grid tie, such as the SMA inverters?
>
> My calculations show that there "should be" about 25% less total conversion efficiency from panel to grid with a battery based system, but those are based on some assumptions that might not be correct, such as how much the battery efficiency etc affects the overall system, and how the inverter determines when the batteries are fully charged.

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