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@acharnley
For how long? It is the combination of speed and time generating heat which must not exceed the density of the unit.
More heat will be generated ... but more airflow will dissipate it. The current model has a short cable to ensure users don't try to stick it in a bag. It's also on the installation card and on the FAQ. With no airflow, 60kph for an extended period of time - does not sound good.
I can not give a definitive statement that it will survive say 60kph for 2 minutes without a load. It was designed primarily for tourers which would need short term overvoltage protection.
I can say that to date there's been no failures with the electronics in any unit and that there's now quite a few audax roadies using them.
PS)
I recommend audax riders use SONDelux as these have a smaller generator more appropriate for these sort of speeds.