😀🚲Testing the new 52V 910Wh #eBikes' battery, range anxiety had me charging it before the 20mi trip that ends in a long 600ft climb while carrying a passenger + cargo. Glad I didn't try to go on "65%", got it to "91%" before starting... But on the way home, we had to stop and switch batteries before the very top of Terwilliger. Checked the voltage on that one when I got home and it's "47%" 😕 so I only get 390Wh before it can't deliver over 500W?
I probably didn't "have to" switch batteries at that point, but the cargo was a couple of new bigger batteries (now I have 3 batteries and 5 cradles that they all fit!) And there's something wrong with my #baseRunner controller settings, I think the battery current limit manifests as a sharp cut out, so I have to carefully use the throttle to get max sustainable power instead of none. Voltage drops, current needs to go up to maintain 700W. I think it handles power + torque limits smoothly-er.
Maybe the BMS would also handle battery current limiting more gracefully than the controller does?
Is it okay at this angle, with just two bolts supporting it? The 25Ah pack is a bit taller than the 17.5.
Ultimately I would like to fit it vertically between the front frame, but that setup will take more than a couple bolts, and will have it hanging rather low behind the wheel, needing some bash guard down there too. Or I build a triangle shelf here and have it sit more upright, probably wouldn't stick out so far.
Andres@enobacon I specifically wanted to avoid having the battery impinging on the cargo area in my bakfiets. My initial placement had it kind of hanging off to the side, which I didn't love. Now I've got it hanging down from the top tube, which puts it higher than I'd like (and also makes me a bit nervous that something could fail and it could fall), but at least it's nicely out of the way.
@enobacon I thought I took pictures, but apparently I didn't (and it's currently still buried in snow). I used one of these to attach to to the frame: https://www.zefal.com/en/bottle-cages/60-gizmo.html
@Andres4NY I like having the weight farther forward so I can easily lift the rear to wheelbarrow it around. The front wheel will also lose traction when it's not loaded. Also, I currently use the two biggest rings of the triple and maybe want to roll my own mid-drive motor with a chain to the little ring so it will be farther forward.
@Andres4NY ooh I'm going to build a frontloader stokemonkey with a fixed cog on the brake disk mount? Then I can keep the triple 🤨 with motor driving the left crank.
Stokemonkey - Retired Products - Our Products
The Stokemonkey was among the first mid-drive conversion kits on the market, using a hub motor and sprocket to drive the left ring of a tandem crankset.. It was developed by Todd Fahner specifically for the Xtracycle longtail bikes, and in ~2013 Grin took over production and distribution when Clevercycles lost interest, adapting it to more modern controllers and motors. The design may be old school, but there are many 100’s of Stokemonkey setups still faithfully hauling people around to this day.
@Andres4NY like this cog, plus maybe a spacer (and I'm going to need to do some teeth vs rpm math)
@Andres4NY This battery would be okay in front of the headset, if the frame had a couple tabs and a bumper for it or a whole extra fixed rack on the front of it. The vertical orientation between the frame would be in front of the floor, and would stick out far less than the bunch of wires in that 12V/USB battery pack hiding under the battery case there which currently runs lights + camera. I need a 52->12&5V buck, but this bike is still rather limited until it gets a mid-drive motor