Round-Trip Efficiency
The percentage of energy retained after storing and retrieving it from a battery system. If 100 kWh is put into a battery and 85 kWh is recoverable, round-trip efficiency is 85%. LFP batteries typically achieve 94–98% round-trip efficiency. Round-trip efficiency affects solar self-consumption economics and overall system performance. Lower efficiency means more generation is required to deliver the same usable energy — relevant when sizing solar arrays for battery-coupled systems.
Related Terms
Two common lithium battery chemistries used in residential storage. Lithium Iron Phosphate (LFP) prioritizes safety, long cycle life (3,000–6,000+ cycles), and thermal stability — better for whole-home applications where longevity and safety are paramount. Nickel Manganese Cobalt (NMC) offers higher energy density (more kWh in less space) but with higher thermal sensitivity. Residential microgrids designed for multi-decade operation typically favor LFP chemistry.
On-site electrochemical energy storage that allows a property to store electricity and discharge it on demand. In a microgrid, storage may support backup operation, energy buffering, and reduced generator runtime. Transfer behavior depends on the selected equipment, system design, and operating conditions. Storage is sized in kWh for energy capacity and kW for power output; both metrics affect supported loads and duration.
Everything Stays On.
Customer-sited generation + energy storage + backup generation + intelligent controls = whole-property power continuity.
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