res-sopzv-min.jpgDeep cycle batteries are accumulators made of lead plates, which have the ability to store energy and deliver it whenever we are in need of it. 

Deep discharge occurs when we use within a few hours (for example 24 hours) a large part of the battery capacity (ranging a30% to 80% of its total capacity, with a recommended battery charge of 50% for photovoltaic systems). )

In order to withstand big amounts of discharge cycles, the lead plates of the battery must be of sufficiently high thickness. If they are as thin as car batteries, they will soon be worn out, destroying the battery.