What are the Disadvantages of renewable sources?

In present time, the only disadvantages of renewable sources are:-

1. They are much more expensive than the conventional or non-renewable sources of energy. However, with more research and advanced technology developed over time, the prices of these units are expected ti decrease considerably.

2. For a solar cell, which produces AC power, it is difficult to store large amount of that power. Hence, if you install a solar array, you might be fine during a bright and sunny day, but you might need another source of energy for powering your place at the night or during overcast conditions.