As a supplier of Battery Systems, Sharp offers, in addition to its photovoltaic modules (PV modules), battery solutions for various needs in order to ensure the greatest possible independence.
Battery Systems concepts :
The battery concepts on the market are distinguished first of all by the components included. Depending on the battery concept, these can be ideal complements to existing photovoltaic systems or complete solutions for new installations.
Battery Systems capacity (kWh) :
The useful capacity of the Battery Systems in kWh indicates the amount of energy that can be obtained from a fully charged battery. Often the nominal (total) capacity is also specified, but it is usually impossible to access it completely. The difference between these values is the depth of discharge (DOD).
Example: A battery has a storage capacity of 16 kWh with a discharge level of 50%; 8 kWh is thus available (50% of 16 kWh). The battery capacity required for your home depends on the size of your PV system, the power consumption and the desired level of energy independence. With the right storage solution, the available capacity can be fully used and you get maximum independence from the network.
There are two main Battery Systems technologies on the market: lithium-ion cells and lead-acid batteries. Both technologies have advantages and disadvantages. Lead-acid batteries are established and proven commercially, but they are very heavy and require a large volume. Lithium-ion cells have a greater depth of discharge, better performance and lighter weight, which explains their use in high-end electric cars, for example.
Lead-acid and lithium-ion batteries have different requirements for the installation site, for example in terms of available space and floor load. Thus, it is important to check in advance the intended location of the battery in the house.
Product warranties cover manufacturing and material faults. The performance guarantee assures you that the decrease in battery performance will not occur beyond a minimum capacity during the warranty period, and also often includes a minimum number of complete cycles. The scope of these guarantees depends on the manufacturer.
Complete cycles :
The operation of fully recharging a Battery Systems and then discharging at the depth of discharge level is called a complete cycle. A complete cycle can consist of several partial cycles (charge and discharge). During the warranty period, a maximum number of complete cycles must be reached. The number of cycles is considered to be based on the specified discharge depth.
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