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I set up a test rig this afternoon. Here are the guide to the VLCD5's battery indicator, the TSDZ2 has factory firmware. Voltage Bars State of charge Above 48V 6 50%-100% 47V-48V 5 40%-50% 46V-47V 4 30%-40% 45V-46V 3 20%-30% 44V-45V 2 10%-20% 43V-44V 1 under 10% Under 43V 0 0%...

Woosh Santana3 should fit well within your budget. Perfect for your height and upright Dutch style riding position. You can fit a Hamax child seat over the rear rack. https://wooshbikes.co.uk/?santana3

Thank you for the numbers. The first bar goes after 35% of charge used and you use 4wh per mile. I will check the LCD with lower battery voltages in the next two days.

I need to know too.

to tell the truth, I know more about Lishui controllers and Bafang motors than the TSDZ2. Andy is on holiday this week, I expect he'll need a couple of days to catch up with his intray before we can set up a test rig to figure out the way the TSDZ2 kit reacts to the battery voltage. On the...

You have already seen that the cutoff speed of the motor is directly proportional to the battery voltage, the coefficient is known as motor constant Kv. It follows that you would want to increase Kv to compensate for the drop in voltage. The way to do that is by field weakening, So I imagine...

Which version are you looking at?

as you said before, it's not a big issue because you would go out with a full battery most of the time. Still, manufacturers are naturally reticent to change the firmware for good reason, one mistake could sink the ship! If you buy your kit from abroad, then OSF is the way to go because you are...

Thank you for the detailed remarks. I will look into how to optimise the motor for a specific cadence regardless of battery voltage.

let's hope so. Whenever a new motor is introduced, there is an opportunity to improve. Some areas that have been candidates for improvement: 1. Stronger motor spindle. It rarely breaks but it's still a weak point. As the motor spins twice as fast as the BBS01, it should be as strong as the...

Simon has 48V 15AH battery with Panasonic 217000 5,000mAH cells. The first bar would start to go as you said, after around (54-1.3)V*3AH=158W, so 150WH is very much ball park figure. He managed 60 miles, that's an average 3WH per mile, which is excellent but there are two factors: 1) he still...

MFC in France: OK, got it. They are indeed a very big firm. I'll PM you later. BTW, did you design the new torque sensor for to7?

who is MFC? and are you associated with to7?

You could start with one of these: 24 inch Kids Bikes | Girls & Boys 24 inch Bikes | Evans Cycles something like this is perfect for easy trails: and add a crank drive kit like this Bafang BBS01B with bag battery...

the motor exudes quality. Where they are (Annecy), the region specialises in high precision engineering.

I haven't noticed the PAS sensor on the controller casing before! Now you have pointed it out, it's a very clever idea! edit: BTW, I have now spotted my mistakes in post #102 and #104. I read the code for the first time on my mobile phone while sitting at the dctor's surgery this afternoon. I...

I don't think you can. There is no connector for a cadence sensor on the TSDZ2 controller. If the torque sensor fails, you have to replace the torque sensor. It may be possible to replace a failed torque sensor with a simple potentiometer though. Thinking about it, one could rig up an arduino...

Yes, just had a quick look. I can't read much on my phone but it seems that the cadence is calculated from the period of the current pulse, not read from a physical sensor. Will look again tonight. I am curious to see how it's done.

yes please. My reply is in the context of a general crank motor which may be a Bosch (which I believe uses field weakening too) or others that may have a cadence sensor. The TSDZ2 does not have a cadence sensor.

Google 'field weakening control'. It's a technique used by OSF TSDZ2 firmware and others to extend the cut off cadence, beyond which the assistance disappears. The technique advances the phase of the drive current, causing a change in the two motor constants (motor (Km) and voltage (Kv)) thus...