Here's an index to posts about facets of the build.
- Frame Selection, Controllers, Keyswitch, Breaker/Main Switch, Power Ckt
- Motors, Torque Arms
- Batteries, Enclosures
- Sideloaders, Battery Mounts
- Safety stuff, Electrical Panel, Keyswitch
- Lighting (Headlight, Taillight, Turn Signals, Strobes)
- Wiring Harness
- Dashboard, Handlebar Controls
- Throttle, Dual Motor Control
- Balance Charger
- Simplified Generic 2WD Wiring
- DIY Truing and Motor Test Stand
- Phase Wiring, Throttle Pinout, CA-SA Shunt
- Misc Bits and Pieces (Deflopilator, Rear Derailleur, Chain Guide)
- Front-mounted Frame Lock
- CA Screen Protector
- Cycle Analogger Packaging/Weatherproofing
- Quickie Video Camera Mount (sample video)
- GoPro Camera Mount
- Cycle Analyst V3 Ebike Simulator
- PAS Assist Installation
- Motor Temperature Monitoring via Axle
- Mundo Component Upgrades, Extras
Here’s a few shots of the bike shortly after it hit the road…
Quickie feature summary:
- Yuba Mundo V4
- Sun Mammoth rims with Fat Franks
(EDIT - switched to 26x2.35 Big Bens)
- (2) BMC V2S gear motors
- (2) Xlyte analog 72V 35A 12 FET controllers (limited to 25A)
(EDIT - switched to Lyen 12 FET 40A controllers)
- (2) series 8S2P Headway 38120 packs in the sideloader
- single Magura throttle for both motors
- handlebar switch for one or two motor operation
- single Cycle Analyst V2 current limit of 850W or 1700W when 1 or 2 motors are engaged respectively
(EDIT - changed to 2000W/3300W for 1 or 2 motors)
(EDIT - switched to CA V3 from original V2)
- Cycle Analyst bypass switch for 1200W/2400W operation (1 or 2 motors)
(EDIT - changed to low, med, high levels different for 1 or 2 motor operation)
- 10A DC/DC converter
- 55W Halogen Motorcycle headlight with 23W motorcycle turn signals
- FIAM Freeway Blaster car horn
- built-in front and rear LED strobes (DIY Extreme Blinkys)
(EDIT - added ebrake-activated brake light)
- EDIT - added CA V3-based RPM-based PAS with bar-end pot adjustment)
- custom sideloaders
- overnight balance charging with VoltPhreaks single cell chargers (no BMS)
EDIT - 11600mi as of Nov 2015 - See this post for updated speed/performance info.
The bike is pretty torquey over a fairly broad speed range – it responds to the throttle briskly and is quick off the line with around 90lbs of thrust from a dead stop (both motors). Since I am usually just cruising and watching the world go by, my usual mid-teens to 20mph speed is very comfortable using one motor on the sort-of-flat -- kicking in the second motor lets the bike pull up most hills with little speed change and usually throttle to spare. On-the-fly switching between one and two motors is handled with a thumb toggle – very much like shifting. A second thumb toggle disables CA current limiting for a boost. The overall biking experience is very easy and pleasurable – in part because the bike rarely seems to be working very hard and flattens most hills.
So – a couple of things to deter some immediate posts
First is the matter of 2WD. This was done for redundancy to achieve a viable ‘limp home mode’ – I don’t want to get stranded far from home with tons of groceries, a smoked motor, and a big honking steel cargo bike. I recently smoked a controller 9 miles from home, switched off the offending controller, reset the breaker, and just continued on my way. I wasn’t any too pleased it happened, but couldn’t have been happier with the 2WD choice as I motored on (2WD Grin!) .
Second: the battery boxes are a bit dorky, but intentionally huge and temporary. The battery mounting issue is a major focus in every build and a major packaging effort right out of the gate seemed a poor plan – just not enough ebike experience yet. Instead, I use some cheapie toolboxes (Pep Boys) that are big enough to let me easily experiment with different XsYp configurations. The current steamer trunks and sideloaders get tossed in the next build phase.
Surprisingly, the big bike is taken as unpowered by most folks, even with the turn signals and battery boxes.
One or two 'knowledgeable' bikey sorts have commented on the big drum brakes to stop such a big bike....