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Rolf Mantel <news@hartig-mantel.de> wrote:Cheap hub dynamoes have a rolling resistance in the order of 15W to generate 3W. A good hub dynamo can probably get those 12W out of a mechanical resistance in the order of 20W.Am 09.04.2024 um 07:57 schrieb Jeff Liebermann:Seems to be claiming 12 watts from the dynamo somehow? Which unless it’sOn Fri, 5 Apr 2024 09:36:27 -0700, sms <scharf.steven@geemail.com>>
wrote:
>What would be nice is a higher-end battery powered light that could be>
charged with a dynamo, and operate at lower power directly from the
dynamo, but there is no such animal. A dynamo to USB-C PD adapter would
be perfect but all the dynamo USB commercial products are to 5VDC only.
Good idea, but the dynamo might need to be enlarged to handle the
combined load of charging the battery and powering the light. It is
possible to do both with the existing 3 watt dynamos using PWM (pulse
width modulation), where the waveforms for powering the light and
charging the battery are interlaced so that the dynamo sees only one
load at a time.
<https://nabendynamo.de/produkte/ladelux/>
will go to market this summer.
>
using the buffer battery that’s going to increase the rolling resistance
significantly ie 4 fold and at that point likely to be quite noticeable.
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