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Here is the complete specs of the controller.

Battery rated voltage: 12v Wind turbine rated power: 300w Wind turbine braked voltage: 15v Recover voltage: 13.5v Quiescent dissipation: <8ma Pretection grade:IP67

Does the braked voltage imply protection for voltage spikes thus braking the wind mill by applying some type of shorted load? Thanks!

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Very sparse data on that controller... When the windmill generates a too high output the controller will apply the brake. This might be a dump resistance or some other smarter load that leaves power for the utility. It doesn't say on this particular controller how it is done. There is a hysteresis that releases the brake when the voltage reaches 13.5V.

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