Because solar panels have been exposed to the elements for several decades, they need to resist water damage as possible. All home solar panels are waterproof.
[pdf] The short answer is yes, solar panels can work without electricity, but their functionality depends on several factors, such as the type of system installed, the presence of a battery storage syste.
[pdf] In New Zealand:most residential homes would use a system between 1.5kW – 4kW. A panel-only no battery 4kWh system is around $10,000.a 3kW grid-connected solar power system is popular because it helps reduce electricity costs, while remaining relatively affordable (around $8,000).battery systems for a standard house cost around $10,000. .
[pdf] The Spherical Solar Power Generator works by using a large transparent sphere to focus diffused sunlight onto a small surface area of mini-solar panels.
[pdf] Plants bend toward the sun in a behavior called phototropism, which scientists have mimicked in a light-responsive artificial “sunflower” that can harvest solar energy.
[pdf] Solar PV is based on the photovoltaic effect, by which a photon (the basic unit of light) impacts a semi-conductor surface like silicon and generates the release of an electron.
[pdf] 
