Electronic & Hydraulic Shifting (Di2, Ui2, customisations)

Apparently using this stuff:

http://www.peterwhitecycles.com/ewerk.php

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I don't see the point. I just carried my Di2 charging cable with me and could plug it in whenever I thought about it or checked and it showed low batt. Seems pointless/silly wiring it up full time. I wonder if LiIon like being continually trickle charged?

yeah me neither and I ride 1/8th of what you do .. but I always wondered if this is possible and someone did it!

Indeed. Seems like a very niche market. The only person I know who has actually let a Di2 battery go flat, to the point it stops working completely, is @Cycliste, and all her electronic devices (phone, tablet, laptop) survive on a maximum charge of about 10%, desperately eeking out their last available electrons. For anyone else, who charges their stuff reasonably regularly, it seems rather overkill.

I think it's mainly for hyper milers who carry a tent and what not with them (and don't see a wall socket for a month).. However with a di2 battery easily lasting 2500 km, I would just bring another battery (or 2). They're only 50 grams

I've flatted mine several times, because I'm idiot and forget to charge.

I just keep the di2 charger in my frame bag. If di2 dies, I plug charger into USB outlet (dynamo), within 2 minutes of peddling it's working again.

That bicycle in the photo is a gimmick.

Di2 battery lasts ~60h.

But I already have USB charging from my dynamo thanks to a D1. Just carry the Di2 charger which takes input from that USB power. I don't need a wall socket to charge my Di2 while riding. It makes no sense to me to wire this up permanently.

I don't know what a D1 is

It's basically the same thing as an E-Work. It takes hub dynamo power and coverts it to a 5v USB output so you can plug in any USB device.

https://www.igaro.com/D1

yeahh.. so in stead of plugging it in sometimes.. it's now plugged in all the time. and cheaper

Plugged in all the time isn't a good thing and it's not cheaper because it's using a 3rd-party battery. The choice of USB charging device is basically irrelevant. But the D1 is better than the E-Work.

Is there a good idiots guide to building a hydraulic ultegra di2 bike?

I am probably going to buy a groupset in parts as i don't need brakes or crankset/bb but i've been finding it a bit difficult to work out which junction box you need and which length cables etc.

Use a bit of string on frame to measure cable length needed, then add a bit for saftey.

You'll need a main junciton box A, and a B. B goes in bottom bracket.

Or just by a groupset without brakes/crankset. Can be done.

get a list of parts together and then connect everything using cables.

How do you know which junction box you need? there seems to be 2 types (3 or 5 pin)

I'll be running an internal battery.

I've found a few complete groupsets but they still come with STIs, which i won't need as i have 785 / 805 hydraulic setup.

3 port is fine. Unless you want TTbar shifters, then 5.

cool, thanks i did think that's what it was for but couldn't get much confirmation.

I'll start putting together a shopping list.

Is there any extra bits worth getting? that bar end charging port looks useful

Nah that's a waste of money. Only usedul if you hide junction box.

Post a list of what you're getting when you've ready. Someone will confirm if it's all there.

Do you want to run it all the time, with the Dynamo hubs constantly powering it?

Even on high end Dynamo hubs, you can actually feel it rumbling slightly when it's on, and sweet fuck all when it's off.

It's best to simply use the Dynamo to charge the battery with a switch without removing the battery in the first place, that would be better.

How are you faring with that? What do you do with the USB plug in terms of storage? Installed it for a customer and he's already come back with it not working. Plug rusted.

Plug rusted.

Did he have the little rubber plug that fit in the USB?

I've never ridden a dynamo hub, but I have a physics degree and know quite a bit about electrical engineering and resulting forces..

And no! Whether it's on all the time or not. It's the amount of charging done that results in a resistance in your dynamo. So when you plug it in occasionally, you get a higher resistance for a shorter time. Resulting in the same total resistance..

It's the amount of charging done that results in a resistance in your dynamo.

But isn't the voltage and current drawn by a charger always going to be the same?

Ie, an iphone charges at like 5v and 1 amp right?

So if you plug it in when the battery is flat and charge it until it's full and then unplug it'll have drawn 5v at 1 amp for say an hour or so.

If you leave it plugged in all the time and the charger maintains the battery at 100% it'll draw 5v/1amp all the time.

No?

I have kind of wondered whether I make things harder for myself by leaving my lights on all the time. I thought that in setups like mine where the on/off switch is on the light, the hub always provided power and therefor had the same resistance. You had to have a switch on the hub (is this even a thing?) that turned power generation on and off to get a difference in the resistance.

On all my dynamos, I find it hard to feel the resistant when riding (on or off) however I can feel the vibration when I turn on the light/e-werk/etc.

The switch is usually on the light/device rather than on the hubs itself.

Unless you ONLY run TT shifters, like moi.