Long duration energy storage efficiency with hydrogen is closer to 40-45%. It is feasible and a good option in certain grid applications.

Erecting vertical solar panels as fencing is an optimal configuration which can reduce support structures, reduce or eliminate cleaning of the photovoltaics, and provides a dual use in terms of fencing in northern and southern borders of plots of land. You can increase structural stability by arranging the panels in a zig-zag pattern much like the wavy single-brick walls used in Britain which adds strength in the in-plane direction. At the junctions, install vertical fenceposts or rigid stakes and the install is dead easy. This configuration is not suited for equatorial regions but northern or southern latitudes only see a 20-30% drop in efficiency at the extreme solar elevations, making this actually a very good solution for those areas of the globe.