Based on the search results, I would recommend either the Dyness A48100 48V 4.8KWH Lithium Battery for R20,569 or the X-101 Lithium Battery 48V 5.5KWH for R26,185.50. Both of these are lithium batteries compatible with your 48V solar system. Lithium batteries are more durable and have a longer life cycle than traditional lead-acid batteries. They also take less time to charge and maintain a charge for longer periods. Since you need a battery for your 5.5kVA inverter, the X-101 at 5.5KWH would be a great match and provide plenty of backup power. However, the Dyness battery is more affordable if you don't need the full 5.5KWH capacity. Please let me know if you need any other details!
