An off-grid solar system (off-the-grid, standalone) is the obvious alternative to one that is grid-tied. To ensure access to electricity at all times, off-grid solar systems require battery storage and a backup generator (if you live off-the-grid). On top of this, a battery bank typically needs to be replaced after 10 years.
Off-grid solar systems can be cheaper than extending power lines in certain remote areas where you’re more than 100 yards from the grid. it is a gift to mankind lives in rural areas where electricity/grid is not available.
Living off the grid and being self-sufficient feels good. For
some people, this feeling is worth more than saving money.
Energy self-sufficiency is also a form of security. Power
failures on the utility grid do not affect off-grid solar
On the flip side, batteries can only store a certain amount of energy, and during cloudy times, being connected to the grid is actually where the security is. You should install a backup generator to be prepared for these kinds of situations.