Translations:Energy storage/26/en

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Depth of discharge is the inverse of state of charge - it is the amount of the storage capacity that has been removed. Depth of discharge is important when designing PV systems as it determines the size of the energy storage system and how many cycles it will last for. Lead acid batteries are not tolerant of regular deep discharges - a typical lead acid battery should not be discharged more than 50% regularly as it will greatly shorten its cycle life. Lithium-ion batteries are far more tolerance of regular deep cycling. The actual usable energy in battery bank is calculated as follow: