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

[Warren Lauzon]

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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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