{"id":90020,"date":"2026-06-28T00:00:00","date_gmt":"2026-06-28T00:00:00","guid":{"rendered":"https:\/\/genixenergy.com.ua\/?p=90020"},"modified":"2026-07-05T22:05:47","modified_gmt":"2026-07-05T14:05:47","slug":"round-trip-efficiency","status":"publish","type":"glossary","link":"https:\/\/genixenergy.com.ua\/ru\/glossary\/round-trip-efficiency\/","title":{"rendered":"\u041a\u041f\u0414 \u043f\u043e\u043b\u043d\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430"},"content":{"rendered":"

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

Why it matters for home backup power<\/h2>\n\n

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

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.(Source: Battery University BU-808<\/a>)<\/p>\n\n

Round-trip Efficiency in practice<\/h2>\n\n

Key numbers<\/h3>\n\n

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

Round-trip vs one-way discharge efficiency<\/h3>\n\n

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

How Genixgreen uses Round-trip Efficiency<\/h2>\n\n

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

Related terms<\/h2>\n\n