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You are buying four 600 volt 75 amp
blocking diodes high amp for wind turbine or solar panel.
it is used to allow voltage from a wind turbine,
generator or solar panel to only go in one direction.
Below is an example of how it's installed.
It is necessary to mount this diode in an aluminum heat sink
to keep it cool, otherwise it will burn out. We do not include the heat sink.
It is easy to make one, any thin aluminum will do.
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pay your taxes, duty or customs fees.