Better battery storage
As solar power is not always available, in order to fill the gaps, either a backup infrastructure of fossil/nuclear fuel power plants is required – or an off-grid storage solution. Previously, the significant extra cost of lead-acid batteries used to discourage many users.
Modern lithium-ion batteries are of superior quality, offering longer lifetimes, higher efficiency and comparatively more sustainability. Moreover, they can even make off-grid solar PV less carbon-intensive than conventional grid electricity.