You can have a system with or without batteries. Without, it can still provide energy and even backfeed the grid subject to the load and its output, but without sun you would be using the utilities energy. With batteries, it can charge a battery energy storage bank and use an Inverter to change the battery DC voltage over to 120 or 240 VAC for use even if you weren't connected to the utility.
Many use like L 16 Deep Cycle flooded lead acid batteries in series parallel to achieve whatever amp hours of energy storage and voltage they require.
Its cheaper to just have the solar panels and backed the utility when possible, but more user friendly and more freedom and choices if you let the solar panels charge a battery bank so you can store that energy (like when sun shines) and then use it at night via an Inverter system when theres no sunshine
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