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the sun goes away for 12 hours every 24 hours. the sun goes away when a cloud passes by, when it rains, when it's foggy, etc. et al, on&on.
that's not reliable.
Another way to look at it; solar energy systems are built to a certain level of power, wattage. that level is never sustained,ever, when it's directly used as energy. A very small cloud can mean thedifference between supplying the power the system is designed to supply or not. Try running a crucial system directly off solarpower and you will quickly see how unreliable solar power is in and of itself.
Thus the need for batteries. Solar charges the batteries, the batteries supply a reliable source of energy.
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