John Bozi wrote:There's no question how great the CA is, however, I wonder if this is the right place to add suggestions or is there thread else where for wish list of future features?
Yes, this is the right place, and you can also put in a feature request on the google docs here:
http://www.ebikes.ca/product-info/grin- ... yst-3.html
down in the "features request and bug report" section at the end.
1. Same as the temperature control for the motor, it would be logical to have one for controllers too. So alternating the display between the too with
C100 would be amazing.
Unfortunately there is only one input signal available for the temperature sensor. It's quite possible to hookup a toggle switch to select between to different thermistors while riding, so you can choose which temperature you want to see, but the CA3 would of course only be able to do thermal rollback on one of them at a time. Usually
controllers will have their own internal temperature sensor and rollback/cutout, while motors have no such protection, so sensing and reacting to the motor temp is more prudent.
2. Instead of just total voltage, have a connector to allow various cell level display. Somehow in Justin magic code be able to display the lowest cell at all times. This would be way more important than showing overall voltage. It could alternate between the two?
It's on the V3.1 release plan to show what the average cell voltage is like instead of just the net pack voltage. To actually sense the individual cell voltages would require the CA3 to be communicating with the BMS as the BMS circuit is the only item on the ebike aware of per-cell voltages, and as there is no standard at all for BMS communications it's a tall order to offer this feature in any universal capacity. Plus, when you have a BMS, you don't really care about individual cell voltages as a) they are almost always exactly the same anyways, and b) the BMS will already look after protection and pack cutout if there is a low cell.
I imagine most people wanting per-cell display are riding DIY packs without a BMS circuit, and the real answer to that is "get a BMS circuit!". Perhaps it's not the ES way, but its definitely the right way.
Just tell me if these are stupid ideas, and yes I know there are other products to do this stuff, but I just think having one display for everything an ebiker needs is better than 100.
Not stupid at all, the dual temperature could and likely would be done if there were more available IO pads, but the per-cell readout would involve designing and making a separate product (level shifting cell monitor that communicates with the CA3), which isn't in the cards in the near future. We came close to going down that path 3-4 years ago, but I'm convinced that all packs should simply have a BMS in the first place.
This a year old necro quote reply sorry. I didn't see this reply from Justin till now while searching for info about regen issues of all things just below the info I was reading.
Interestingly enough in the meantime "my" idea was realised by adaptto, I swear I didn't know it existed if it did at the time of my wish list....
EDIT: But I must note I was not interested in a cell draining bms. I just want the display to know when
to balance the cells.
I haven't gone that route because I want the CA and would feel locked in to what sounds like poor support using their complete system and $$$$.
I don't trust BMS direct from China that I can't see individual voltage readings. I just thought some how a stand alone board for all the hk lipo users could choose for example 4 x 6s packs and plug in our balance leads into and have that reading come up on the screen might have massive appeal. Pretty sure there is a decent hobby lipo customer base still today.
You can tell people to do something such as using a bms or you can face up to the reality that we will not and actually still make a difference to the ebike community. Voltage and heat are the biggest things to monitor and could possibly not only save components, but also save lives.
On the temp sensor point, a switch would be completely "cool" (and reassuring for diy-ers where we push the limits of batteries and controllers) that you can swap between battery, controller and motor. My lyen is much hotter to touch than my qs and although I check my 8 x 12ah 6s multistar packs (100v 24ah) every ride for balance, I would love to know when there were an unacceptable heat increase to the packs.
I imagine this would require two products lots of diyers would buy from you.
1. a small board for bat balance leads
2. a switch connected to 3 temperature leads (include optional extra probes for how many required)
In the last few years of riding 3 different rear hub motors, a front hub motor, 2 different mid drives, 4 different controllers, a multitude of battery set ups, I haven't changed my opinion on the usefulness of having individual cell readings (or at least the worst cell EDIT: the max-min cells or even difference) and the usefulness of having temperature readings of the 3 main components that make up the DIY ebike world. Sure I can slap 8 of these on my bike....
Finally, sorry if this was annoying. Love your products and am a serious supporter of your work.