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Solar batteries store power generated from a power source (eg solar panels) and discharge when the power is required (through an inverter). e.g. At night time when there is no sun to power a solar array or when there is a blackout.
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 Deep-cycle
solar application batteries are used in renewable energy applications as these batteries typically feature thick plates with a high-density
active material. The thick battery plates allow for reserve energy to be
stored deep within the battery plate and released during slow discharge. The high-density active material
remains within the batteries' plate/grid structure longer, resisting the normal
degradation found in cycling conditions. They are typically used where the
battery is discharged to great extent and then recharged. The solar 'Deep Cycle' battery uses a different chemistry for
the plates' active paste material, and a slightly stronger acid. This chemistry
allows for a much longer life in deep cycle applications with only a slight
reduction in maximum power output.
Deep Cycle refers to applications that typically discharge 60%
to 70% or more of the battery capacity. An automotive battery is an SLI
battery (Starting, Lighting & Ignition). Typically used as an automotive battery its plates are designed to deliver
maximum power for a short duration. Starting an engine typically discharges an SLI battery 3% or less. When an SLI battery is used in a deep-cycle
application or in a vehicle with heavy accessory loads, the battery life will be
shortened proportionally to how deeply and frequently it is discharged.
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A typical renewable energy system has three main elements to its power source: