A solar battery is a rechargeable battery that integrates a solar cell with battery power storage.
A second meaning of solar battery (Typ II) are rechargeable batteries which have been developed specifically for use in photovoltaic systems or are just used for. They are used especially in stand-alone systems for storage of energy produced by solar panels and batteries as a buffer when major consumer operation. [1] Often, the term is also commonly used for built-in solar power applications batteries, even if they are not specified for it.
The most commonly used for solar batteries battery type was in the past, the lead-acid battery. For its use of low price per storable energy quantity, the achievable maintenance, the low self-discharge and the relatively high efficiency of about 80% spoke. The losses in lead-acid batteries can be explained in part by the outgassing of hydrogen-oxygen during charging. With maintenance-free lead-acid batteries the gas emissions are reduced. Solar-lead batteries vary in their internal mechanical structure of the other lead-acid batteries, they are optimized for a particularly long service life, cycle stability and behavior at low discharge. Typical are numbers of cycles of 1200 (with a depth of discharge of about 80%) to a residual capacity of 80%, since then a battery is considered defective from. Maintenance-free lead-acid batteries have the advantage that there are no or only forms a minimum stratification she sure but allow only a much smaller number of cycles from 400 to 600. An additional circulation of acid prevents completely stratification and the lead-acid batteries. This is especially important in stationary operation.