SOH (State of Health) is a measurement of a battery’s current usable capacity expressed as a percentage of its original capacity at manufacture. A new battery starts at 100 percent SOH; SOH declines gradually with each charge-and-discharge cycle as the cells age over years.(Source: Battery University BU-808)
Why it matters for home backup power
A home backup system is sized to run specific loads for a target duration. That sizing assumes a certain usable capacity. SOH is the number that tells you whether the battery still delivers that capacity. A battery at 85 percent SOH holds 15 percent less energy than when it was new, which shortens backup time for the same connected loads. Tracking SOH lets you plan capacity additions or replacements before the shortfall becomes a problem during a blackout.
LiFePO4 chemistry makes this decline slow. It holds capacity far more consistently across thousands of cycles than lead-acid or higher-density lithium chemistries, which is why it is the standard choice for home storage where the system must perform reliably for years.
SOH in practice
Key numbers
Battery cycle life is conventionally rated to the 80 percent SOH threshold: a battery is considered to have reached end-of-rated-life when it can store only 80 percent of its original capacity. Genixgreen LiFePO4 systems are rated for 6000+ cycles to that boundary; see Ресурс циклов for how that rating works. For backup planning, usable energy at any point is roughly SOH multiplied by nameplate capacity and then by depth of discharge: at 90 percent SOH and 90 percent DoD on a 10 kWh pack, usable energy is about 8.1 kWh, not the nameplate 10 kWh.
SOH vs SOC
SOC (уровень заряда) is a real-time fuel gauge: it shows how much of the current usable capacity is available right now, resetting toward 100 percent at the end of every full charge. SOH is the long-range health score: it measures how large that usable capacity is relative to the original, changing slowly over months and years. The two numbers work together. SOC tells you what is in the tank today; SOH tells you how much smaller the tank has grown compared with when the battery was new. They answer entirely different questions and are tracked separately by the BMS.
How Genixgreen uses SOH
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 battery includes an integrated BMS that monitors cell voltage, temperature, and current to calculate and report SOH continuously. This gives installers and end users a live health score rather than a surprise capacity shortfall, and it supports capacity-planning decisions well before SOH approaches the end-of-life boundary.
Related terms
- Ресурс циклов: the rated number of charge-and-discharge cycles before a battery reaches the 80 percent SOH end-of-life threshold
- SOC (уровень заряда): the real-time charge level inside the battery, measured per cycle; a different dimension from SOH
- BMS (Battery Management System): the electronics that track cell data and calculate both SOH and SOC inside every Genixgreen pack
- Explore the full Genixgreen product range to see LiFePO4 systems sized for homes and commercial sites
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