07Nov
Energy capacity refers to the total amount of energy that a battery can store and is measured in ampere-hours or watt-hours (Wh). The design of the modern battery system is scalable. The size of the storage system can start from few kilowatt hours and can go up to hundreds of megawatt hours keeping a consistent design. While a battery with a high capacity and a low power rating would deliver a low amount of electricity for a long time, a battery with low capacity and a high-power rating would be able to bear the entire load, but only for a few hours.
The depth of discharge (DoD) of a battery refers to the amount of a battery’s capacity that has been used. It is denoted with a percentage value of the total capacity. Owing to the chemical composition of the battery, the life of the storage system heavily depends on the maximum DOD level the battery is discharged repeatedly. In simpler words, a higher Depth of Discharge means that more of battery’s capacity can be utilized by the consumer. Most battery manufacturers specify a maximum Depth of Discharge for optimal performance of batteries.
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Lifespan refers to the number of years a battery can be used effectively, and can vary depending on a number of factors. Solar applications generally require one charge-discharge cycle of the battery per calendar day. A lead Acid battery designed for solar applications can provide around 1000 cycles which can roughly last for 2.7 years While Lithium-ion batteries can provide 3000 – 10,000 cycles, depending on the manufacturer, and can last up to 10 – 30 years.
While all these factors depict the performance of the battery, for a complete picture, it is important to consider other factors as well, such as the C-rating, manufacturer reputation and warranty before you invest in a battery system.
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