SOC (State of Charge) is the real-time percentage of energy remaining in a battery, expressed on a scale of 0 to 100 percent, where 100 percent is fully charged and 0 percent is fully depleted.
Why it matters for home backup power
During a power outage, SOC is the single number that tells you how much reserve is left. A battery management system (BMS) reads SOC continuously and reports it to the inverter and any connected display, so homeowners and installers can see at a glance whether the system can carry critical loads through the night, or whether non-essential circuits should be shed to stretch the reserve. How long that reserve lasts depends entirely on the load connected to it: a refrigerator and router draw far less than a heating pump and several rooms of lighting, so runtime is always load-dependent and cannot be stated as a fixed figure.
SOC also controls charge and discharge boundaries. When SOC reaches 100 percent, the BMS signals the inverter to stop, preventing overcharge. When it falls to the configured low-SOC floor, the BMS triggers a protective shutdown before deep discharge can damage cells.(Source: Battery University BU-808)
SOC in practice
Key numbers
Genixgreen LiFePO4 systems operate at a nominal 51.2 V and are rated for 6000+ cycles. In daily use, the practical SOC window is roughly 5 to 100 percent. Keeping the battery away from extended periods at either extreme (near 0 percent or sitting at 100 percent for days) reduces electrochemical stress and supports the rated cycle life.
SOC vs DoD
SOC and depth of discharge (DoD) describe the same moment from opposite directions. SOC is the energy remaining; DoD is the energy already withdrawn. If SOC reads 20 percent, DoD is 80 percent. Specification sheets typically quote DoD to describe a rated discharge cycle; the inverter and BMS display SOC to show current state. Knowing which convention a datasheet uses prevents misreading a performance figure as an operational limit.
How Genixgreen uses SOC
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. Every Genixgreen home and commercial battery includes an integrated BMS that monitors SOC in real time, transmits it to compatible inverters over CAN or RS485, and shows it on the front panel. The BMS enforces the safe SOC window automatically, stopping charge at the top and cutting discharge at the bottom, without manual intervention.
Related terms
- BMS (Battery Management System): the system that reads and acts on SOC in real time
- DoD (глубина разряда): the complementary metric, measured from the opposite direction
- Ресурс циклов: how the SOC operating window shapes long-term cycle count
- SOH (состояние здоровья): the long-term capacity-aging measure that complements the real-time SOC reading
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Sources
- Battery University BU-808: How to prolong lithium-based batteries (SOC thresholds, DoD, charge management). https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries