75% Efficiency From Induction Electrification of Roadbeds

Since battery costs are 2X grid costs, even 33% efficiency would be competitive with charging stations.
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http://en.wikipedia.org/wiki/Wireless_energy_transfer#Size.2C_distance_and_efficiency
Wireless electric energy transfer for experimentally powering electric automobiles and buses is a higher power application (>10kW) of resonant inductive energy transfer. High power levels are required for rapid recharging and high energy transfer efficiency is required both for operational economy and to avoid negative environmental impact of the system. An experimental electrified roadway test track built circa 1990 achieved 80% energy efficiency while recharging the battery of a prototype bus at a specially equipped bus stop <SUP class=reference id=cite_ref-17>[18] <SUP class=reference id=cite_ref-18>[19]. The bus could be outfitted with a retractable receiving coil for greater coil clearance when moving. The gap between the transmit and receive coils was designed to be less than 10 cm when powered. In addition to buses the use of wireless transfer has been investigated for recharging electric automobiles in parking spots and garages as well.
Some of these wireless resonant inductive devices operate at low milliwatt power levels and are battery powered. Others operate at higher kilowatt power levels. Current implantable medical and road electrification device designs achieve more than 75% transfer efficiency at an operating distance between the transmit and receive coils of less than 10 cm.
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Any pot holes deeper than 10 cm are "shovel ready" projects.
Bret Cahill
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Bret Cahill wrote:

Please explain. A battery is a capital investment for energy storage. Grid electricity is paying for energy as you use it.
These are wholly different concepts. You cannot compare them.
Graham
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How many times can the battery be cycled before it degrades and needs to be replaced?

Most batteries are so expensive they will need financing and people will be paying as they use the battery.
Bret Cahill
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