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Yes my D1 was inside the framebag, air temperature wasn't more than 20ºC but 2 of 5 times I reached to connect it, it was too hot... couldn't find any reason, wasn't very lucid without sleep either. Hope he has some idea why this happens... anyway it didn't stop working so its ok I guess
SP Dynamo is not as robust as SON, but both @CarlosBI and Jesse Carlsson used one to be 2nd and 1# in the TransAm and many more km's, so its ok for my yearly mileage :) for the price
bertocq-
The D1 will begin to dump unused power as heat at about 19-20V to protect it's electronics, in one of the two conditions;
- Going very fast downhill with a USB device in or,
- going fast without a device in (still talking racing, not touring speed).
If you're going fast most the time it'll be better to keep a device plugged in so that it doesn't trigger (can I ask why your plugging/unplugging so frequently)? The case is aluminium and is used to heatsink the power loss should it need to occur (the usb wire isn't) so would be more noticeable inside a bag. It's not a problem though.
Hope that helps!
- Going very fast downhill with a USB device in or,
acharnley
I wonder if @acharnley will comment on the heat issue? Perhaps larger heatsink could be added if necessary or maybe it was lack of airflow? If it's out in the airflow it might be alright but I plan to stick mine in a top tube bag or frame bag. Thoughts?