...and very well it worked, too!
If I was doing something similar without a trailer, I would mount a rigid bar across the back of my rack same width as handlebars, so 650 to 700mm, and then a 400mm foam extension on the offside only. All brightly coloured, reflective, and with a rear light at...
Your get out of jail free card is to carry a charger with you.
Even better is to buy a faster charger and carry that. With Bosch you have the option of both 4 amp and 6 amp chargers. An hour lunch stop in a cafe with 6A going into your battery is half a batteries worth!
Coincidentally I charged my 18 month, roughly 3,000 miles usage battery at work today, and full these days it says 130km, so about 13% down on new.
When I got home, which is only 4km, but hilly, it was saying 69km left in eco /level 1.
30 to 35 miles in eco is about right for 400Wh. Your Bosch sounds like it rep8rts quite differently to my Shimano, which every cold switch on forgets your riding history and starts in very optimistic mode!
A new Shimano 418Wh battery on my e5000 bike fully charged will report 150km range in...
That was a bit tongue in cheek, being my bike storage at work.
There is usually a spot where at least the saddle will stay dry, but it is not unusual for 75% of the floor to be wet from rain!
Watch the machining accuracy on some of these mounts. Fine for low cost lights, not a good fit always for the GoPro camera mounting prongs. If too loose, overtightening the screw can damage the camera bits.
And in your picture of many bits, @guerney, be cautious of the non GoPro mounting bases...
It looks as though the caliper is not parallel with the disc either in vertical or horizontal. And having to be pushed far right on its mount.
If there was a washer inside the frame on the axle I'd remove it, but I don't see one.
Is this newish bike and first time wheel has been out? If so...
Lights on helmet is fine, not illegal. But they do not fulfil the legal requirement of positioning, so a second light that does is needed.
Of course you will now be arrested and incarcerated for many hours....
LiFePO4 is 3.65V per cell at full charge I think, so is your 41V an overcharged 11S, which should be 40.15, or a rather low 12S, which ought to be 43.8?
If the latter, then perhaps there is a balance issue, with one cell being very low and the others OK. Can you get at the balance connector or...
It sounds like you want powered assistance to 25mph. That's not the best starting point!
I'd suggest a lightweight 250W legal conversion on your existing bike as a starter, ride that for a few hundred miles and build version 2 when you work out what you really need.