Originally Posted by
gauvins
Trying to better understand what's at stake, for my own purposes, I've calculated the table below. It looks at the energy produced by high vs low output chargers (essentially the ForumSlader vs the rest) for a tourist like me, i.e. pedalling at 125W with a combined weight of 110Kgs (rider + bike + luggage) over courses of 100Kms. ...
I mostly concur, but I found that I can travel self sustained for power with a GPS on when i am rolling.
1 - Fully agree, the amount of time you are producing high wattage is minimal compared to the amount of time climbing when you are producing minimal at best.
2 - I use a GPS, Garmin 64. It is not a cycling specific unit, powered by two AA batteries. But I can charge AA rechargeable batteries in it with my USB charger, and by using AA to AAA adapters can put AAA rechargeable batteries into it to charge up, I use AAA batteries in my taillights. I leave my phone off when I am not using it. If I had my phone on, they you are right in that I probably could not stay self sustained for power. The Garmin can't directly charge AA batteries, it has to be fooled into thinking that a Garmin branded battery pack is in it. I wrote up some comments on the Garmin 64 here, that page also has another link to some other comments I made.
Best Garmin model - that does routing - for 400km-1200km brevets?
3 - Fully agree. The way I look at it is that dynohub drag might be equivalent to less than a one or two mph difference in headwind.
4 - I have nothing to add.
Photo is of my Garmin 64 on my Florida trip. I have a DIY bracket to mount it on my stem cap bolt on that bike.