In the meantime, in order to lighten our load on moving day we are having a significant sale on our entire inventory of the large Crystalyte H35 and Crown motors and kits, ranging between 25 to 30% off. There isn't a better time to start a winter build project than this. You can get a great deal on a direct-drive motor package and simultaneously help us out with the moving process!
The sale will go on from now until Feb 25th, and we’re hoping that you can help us clear a good number of these boxes from our rack shelving before we need to move out.
We do also have a slight ulterior motive in that we want all of our direct drive motors in 2016 to be compatible with Statorade coolant, but the stock Crystalyte side covers aren't always sealed well enough to prevent leakage at high RPM's. Our next Crystalyte motor batch will be certified Statorade-ready, but these ones require reworking the side cover seal with silicone before adding a fluid coolant inside.
Our tidy wiring kit has been a popular way to get clean cable runs and covered connectors on your ebike project. And being all black it does a reasonable stealthy job of it. But what if you’ve got a colourful bike and want a bit more zing?
Grin’s manufacturing crew has been playing with fabric dyes and suppliers of coloured spiral wrap and zip-ties to produce bright yellow, red, and blue wiring kits too.
We love seeing ebike conversions where people pay extra attention to the look and details of their installation. So we’re starting a little contest for people who order one of the coloured wiring kits between now and Mar 1st. Send us a picture of your finished ebike project featuring one of these routing kits and we’ll award our favorite 2 conversions with a 20% off coupon for your next order.
The company TDCM from Taiwan has been among the more innovative players in the electric bicycle space. We’ve been carrying their bottom bracket torque sensors for a while but last year one of their motors really caught our eye. This was a direct drive motor surrounding an internal 5 speed Sturmey Archer hub. You get the benefits of a derailleur-free 5 speed transmission with a 243% gear ratio plus a ~500-1000 watt hub motor all in one tidy package.
We wind tunnel and dyno tested this motor last summer and liked almost everything about it, and are happy to have this in stock in a fast winding both as the bare hub and also as part of a complete kit. The motor includes an internal 10K thermistor for temperature sensing with a V3 Cycle Analyst, and is the first hub that we are offering pre-filled with Statorade for improved thermal performance.
Great news to kick off the New Year. We are now dropping the price of all our V2 and V3 Cycle Analyst devices, to just $95 for a V2.4 CA-DP and $125 for a V3.0 unit. Having served as our flagship product for a decade and financed most of Grin’s R&D activities, we owe a lot to the Cycle Analyst, but we feel it’s time for other products to move in as our main breadwinners and pass the CA savings back to you.
The V3.0 Cycle Analyst firmware is now officially at 3.0, no more Prelim6, p12, p13 etc. as the latest tweaks have made it as rock stable as we could hope. Anyone with an existing CA3 can update to this firmware via the software download page. On new CA orders the USB->TTL programming cable for updating firmware is now no longer included in the package, but can easily be added as an accessory if desired.
Thank you all for the many well wishes for our 10 year anniversary celebrations, it’s been a joy having so many customers who have been around for huge chunks of the ride.
Extended Range Satiator Family
While the 10% sale is over, there are other great things to be excited about. First and foremost? We’ve started our beta sales program for high voltage Satiator chargers. Now rather than being limited to 63V or 15s packs, the 72V 5A model can work all the way up to 103V for 24s lithium batteries for those hot rod ebike applications.
There are a limited number of 24V 15A and 72V 5A units from our pilot production run available for early adopters who don’t require UL/CSA certification, and if you order by this weekend with Fedex shipping it should make it in time for the Christmas Tree.
Flexible Power Cables
Secondly, after years of wondering why there were no great heavy gauge cable sources for ebike battery and motor wiring, we decided to bite the bullet and have thousands of meters of our custom cable manufactured.
The 3 phase motor cable has high flexibility 413 strand 12 gauge phase wire with Teflon insulation, and also includes 7 signal wires too, for your motor hall sensors and thermistors. All of this is bundled in a round 9mm diameter flexible jacket and it stays flexible all the way to -30oC.
For our custom battery cable, instead of going with 2 conductors, we went for a 4 conductor instead. A pair of heavy 13g wires and a set of thinner 18g wires also with high strand count and flexibility. That allows one cable to have say both the charging and discharging ports on a battery, or an additional tap point for powering accessories. Or, you can just parallel connect the thin and thick wires together to have 12 gauge equivalent.
2015 Housecleaning Garage Sale
And finally, we’re clearing out a bunch of used ebike stuff that has been allowed to accumulate over the past year. So if you are looking for some bargain priced garage sale items, John’s got everything posted up on an endless-sphere buy/sell thread.
Nov 30th, 2005 marks the day that the Renaissance Bicycle Company Ltd. was formally recognized as a registered company here in BC.
Back then, we were being somewhat cutting edge offering custom layout NiMH battery packs when almost everything was lead acid. Early hub motors and mid-drive systems were battling it out. Rechargeable lithium batteries were a promise of the future but still exceedingly unreliable, motor controllers were analog and didn't even have a microchip; the DrainBrain was being hand soldered in batches of a dozen at a time in a basement; and scarcely anyone on the streets had heard of an electric bicycle. Oh the world seemed ripe with possibility.
And now here we are, 10 years on to the day. The lithium ebike packs are ubiquitous with power, energy, and reliability specs that could only be dreamed of back then. Motor controllers run sophisticated DSP's that do vector alignment of the 3 phase drive; the DrainBrain evolved several generations of Cycle Analyst and has sold over 25,000 pieces; hub motors and mid-drives are still battling it out; and you'd be hard pressed to find anyone who hasn't heard of an ebike or knows someone who rides one.
Throughout this we've managed to survive and grow year after year, leading the field in some areas while lagging in others, but always staying focused on the unique needs DIY entrepreneurs and enthusiasts who want to make their own 2-3 wheeled electric vehicle creations.
We're not much for cyber-Monday type blowout sales but as a small token we're celebrating the occasion with a blanket 10% discount on all items in our store, which will last until Dec 10th, to honor these 10 years. Simply log-in with your customer account (or create one if you haven’t done so), and you'll see the prices reduced by 10%.
Since March of this year we’ve quietly rolled out numerous minute improvements in the V3 Cycle Analyst firmware. Now the latest CA3P13 code includes support for Proportional Regenerative Braking with any Grinfineon or Phaserunner motor controller. Simply squeeze the ebrakes for a base regen and use your throttle to dial it in! Have a read of the cumulative release notes for all the details or see the video below for a quick summary.
There’s no need to upgrade if you are happy with how everything is running. But if you use the auxiliary input potentiometer, torque or PAS control, or have a system that supports proportional regen via a 0.0-0.8V throttle signal, then an update for these new features could be worthwhile.
The CA3P13 firmware package can be downloaded from here.
We're looking for people who want to participate in one of the biggest recent breakthroughs in the thermal management and hence power handling capability of direct drive hub motors. If you've got an ebike setup with motor temperature monitoring and routinely see core temperatures in the 100+ oC range, then please read on because this post is for you!
See, earlier this year we built a wind tunnel in our lab for doing full testing of hub motors in conditions that mimic riding in the road. Our motivation was to better understand and model how hot motors get in heavy use at different vehicle speeds, both for predictive reasons and see what techniques can push that working envelope further.
Well, in addition to the usual suspects of ventilation holes, vanes, and oil cooling, we also experimented with magnetically active ferrofluids. The theory was that the magnetic fluid would stay put in the air-gap and not leak out everywhere as is common with conventional oil cooling. What we didn't anticipate was just how TINY an amount was required to achieve remarkable effects. With just 4-5 mL, you could have almost as much cooling benefit as a full cup of messy ATF, with almost no perceptible increase in the rolling drag of the wheel.
The net effect is that you can run a given motor at about 40% higher continuous torque and power outputs without overheating. Or correspondingly, a motor that used to run at like ~110-120 degrees in a given situation would now be sitting at a much more comfortable 70-80 degrees. Have a look here at our own GRIN designed prototype hub motor when dissipating just under 100 watts of power. The steady state core temperature drops from 68 °C down to 43 °C.
You get this without exposing the motor core to the outside environment like air cooling, and without the impossible sealing complications and additional rolling drag from oil fills.
What we are still looking to understand are the long term stability and maintenance concerns; whether it lasts for years and years or will need frequent or occasional replenishment, and also what if any compatibility issues might exist with magnet bonding adhesives in the motors. If you want to be part of this endeavor, then we've got 10mL syringes of Statorade packaged and bundled and ready for you.
Charging, Satiator 1.0 Firmware
One thing for sure about the electric bicycle scene is that things don't sit static, incremental improvements are happening year after year.
Charging, Satiator 1.0 Firmware
Field Oriented Controller
We're hoping to make this a standard and stock cornerstone of our controller and kit offerings by fall of 2015, but in the meantime we're still producing a couple of these a day for advanced technical users.
Alex DM24 Rims with 3D Drilling
Anyone who has laced a large diameter hub motor into a small diameter rim will be more than familiar with the problem of spoke angle. Just a single cross pattern will produce an angle that puts large stresses on the nipple and bends the spoke, something we've modeled on the hub motor spoke calculator for people to anticipate. Alex Rims has been offering 3D drilling of their spoke nipple holes in the rim to allow the nipple to exit at an angle rather than radially inwards, and we got a large number of these in a 20" rims size drilled out to 14 degrees which should allow you to do single cross lacing jobs when previously only radial would make sense.
Unfortunately, the 3D drilling is not compatible with their rim eyelets at the moment, so for the 24", 26" and 700c DM24 rims we opted to go for stainless eyelets instead.
Shop Video Tour
Last week we also had an unexpected visit from Court, who runs the excellent electric bicycle review site electricbikereview.com. What was supposed to be just a short quick shop tour ended up taking a good chunk of the afternoon, which Court kindly recorded and uploaded to youtube. If anyone is curious to see the inner workings here at Grin and has time to spare, enjoy the video.