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        "rendered": "<div class=\"vgblk-rw-wrapper limit-wrapper\"><p class=\"gloss-def\">Round-trip efficiency is the ratio of energy a battery delivers out over a complete charge-and-discharge cycle to the energy put in during charging, expressed as a percentage. At the system level, a modern LiFePO4 installation reaches about 90 percent round-trip efficiency.<\/p>\n\n<h2>Why it matters for home backup power<\/h2>\n\n<p>Every time you charge a battery, some energy is lost as heat inside the cells, the BMS, and the inverter electronics. Round-trip efficiency captures that total loss over one full cycle. A system with 90 percent round-trip efficiency returns 9 kWh for every 10 kWh pushed in. For a solar-charged home battery, that 10 percent loss is the energy your panels must generate above your storage target to actually fill the battery.<\/p>\n\n<p>One important distinction: runtime and backup-time math uses only the one-way discharge efficiency of the inverter (90 to 95 percent), not the full round-trip figure. The approximately 85 percent usable energy planning figure cited across this glossary combines depth of discharge (80 to 95 percent) with that one-way discharge efficiency; round-trip efficiency is a separate metric applied when calculating charging energy requirements, not when estimating how many hours the battery will run your appliances.(<a href=\"https:\/\/batteryuniversity.com\/article\/bu-808-how-to-prolong-lithium-based-batteries\" rel=\"noopener noreferrer\" target=\"_blank\">Source: Battery University BU-808<\/a>)<\/p>\n\n<h2>Round-trip Efficiency in practice<\/h2>\n\n<h3>Key numbers<\/h3>\n\n<p>For a Genixgreen LiFePO4 system, system-level round-trip efficiency is about 90 percent, accounting for losses in the cells, BMS and inverter across a full cycle. LiFePO4 cell efficiency alone is typically higher (93 to 98 percent), but real-world system efficiency includes inverter conversion losses and DC wiring resistance. The distinct usable-energy planning figure of about 85 percent of nameplate combines depth of discharge (80 to 95 percent) with one-way inverter discharge efficiency (90 to 95 percent).<\/p>\n\n<h3>Round-trip vs one-way discharge efficiency<\/h3>\n\n<p>Round-trip efficiency measures energy in versus energy out over a complete cycle, end to end. One-way discharge efficiency covers only the output half. Apply round-trip efficiency when sizing a solar array or estimating how much grid or solar energy is needed to charge the battery. Apply one-way discharge efficiency, combined with depth of discharge, when calculating how long the battery will run your home during an outage. Using the round-trip figure in runtime math will understate available backup time.<\/p>\n\n<h2>How Genixgreen uses Round-trip Efficiency<\/h2>\n\n<p>Genixgreen has built LiFePO4 storage in its own factory since 2011 and ships to 100+ countries, with local stock in Odesa for delivery across Ukraine. System-level round-trip efficiency for each product line is validated in factory testing, with the approximately 90 percent figure reflecting full system losses rather than ideal laboratory cell values.<\/p>\n\n<h2>Related terms<\/h2>\n\n<ul>\n  <li><a href=\"\/en\/glossary\/dod\/\">DoD (Depth of Discharge)<\/a>: the share of nameplate capacity used per cycle, which combines with one-way discharge efficiency to set the usable energy planning figure<\/li>\n  <li><a href=\"\/en\/glossary\/kwh\/\">kWh<\/a>: the energy unit for both gross and usable capacity, and the base for any efficiency calculation<\/li>\n  <li><a href=\"\/en\/glossary\/cycle-life\/\">Cycle Life<\/a>: how many full charge-and-discharge cycles a battery completes before capacity falls to 80 percent<\/li>\n  <li>Explore <a href=\"\/en\/product\/\">Genixgreen systems<\/a> with rated efficiency and capacity specifications<\/li>\n  <li>Back to the <a href=\"\/en\/glossary\/\">Energy Storage Glossary<\/a><\/li>\n<\/ul>\n\n<h2>Sources<\/h2>\n\n<ul>\n  <li>Battery University BU-808: How to prolong lithium-based batteries (depth of discharge, usable energy, efficiency in full charge-discharge cycles). <a href=\"https:\/\/batteryuniversity.com\/article\/bu-808-how-to-prolong-lithium-based-batteries\" target=\"_blank\" rel=\"noopener\">https:\/\/batteryuniversity.com\/article\/bu-808-how-to-prolong-lithium-based-batteries<\/a><\/li>\n<\/ul>\n\n<\/body>\n<\/html>\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"DefinedTerm\",\n      \"@id\": \"https:\/\/genixenergy.com.ua\/en\/glossary\/round-trip-efficiency\/#term\",\n      \"name\": \"Round-trip Efficiency\",\n      \"alternateName\": [\"round trip efficiency\", \"RTE\", \"charge-discharge efficiency\"],\n      \"termCode\": \"round-trip-efficiency\",\n      \"description\": \"Round-trip efficiency is the ratio of energy a battery delivers out over a complete charge-and-discharge cycle to the energy put in during charging, expressed as a percentage. 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