The Rolls Surrette S-1590 (S1590) solar deep cycle battery is designed specifically for renewable energy applications and is backed by a 7 year factory warranty (2 years replacement, 5 years prorated). The Rolls Surrette S-1590 (S1590) battery is rated for 1200 cycles at a 50% depth of discharge, better than any other L16 battery on the market. It achieves such a high rate by using the thickest positive plates(0.170") enveloped and wrapped in a structured foam container. This battery has the highest liquid reserve of any L16 battery. Ideal for a small/medium size systems. 1590 amp hours @ 100 Hr. rate, 1280 amp hours @ 20 Hr. rate at 48VDC utilizing 24 S-1590 batteries.