An on grid inverter is a device that converts DC electricity from solar panels into AC electricity, which is compatible with the electrical grid.
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A micro inverter is a small device that converts the direct current (DC) electricity generated by a single solar panel into alternating current (AC) electricity, which can be used by your home appliances or sent back to the grid.
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Electricity can be stored directly for a short time in capacitors, somewhat longer electrochemically in, and much longer chemically (e.g. hydrogen), mechanically (e.g. pumped hydropower) or as heat. The first pumped hydroelectricity was constructed at the end of the 19th century around in Italy, Austria, and Switzerland. The technique rapidly expanded during the 1960s to 1980s,.
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The short answer is yes, individuals can sell surplus solar electricity back to electric companies. This is commonly facilitated through net metering programs, where the utility company credits the solar producer for the excess energy supplied to the grid.
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