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They dont have to be close at all. One battery can be fully discharged and the other fully charged. However (and this is very important), this is only the case where each battery individually is capable of supplying full current to the controller. So for example in my case, I often parallel my...

I have used a dual 20 + 20 amp (MBR4045, total 40 amp) as below bolted to a flat piece of aluminium for heat sink (about 2 square inches area) and placed in a small plastic box. Works great at 36 volts. For a 48volt battery, you need something like the MBR 4060 (60 volt) if you want full...

Thanks vfr400 for the tip about C14. In my case, I changed the value to C14=3, and it increased the pas levels (approx) from 60/100/160/245/425 to 80/140/220/300/425. It doesen't seem to effect the PAS5 (maximun power)setting but I think it improves, especially with pas 4, which previously...

It should be possible to measure the 'loss' of magnetism on a motor and then to assess if its a problem or not. That's because a loss of magnetism will weaken the magnetic field and this will reduce the torque and efficiency proportionally. However, field weakening actually makes the motor spin...

Actually, if you think about it, nearly all front hub pedal assist bikes are two wheel drive. (legs drive rear, motor drives front). Anyhow, I would not fit a front hub to tsdz2 as its fast enough for me as its is and has enough torque, and anyhow, its possible to get even more torque by...

The link below is the model of both motors climbing a 10% grade. (1 in 10). Both motor run to the max and so power splits well. A lower pas (4) is selected for lesser grades. Now I am not really a fan of 2wd as such and have no problems from a traction point of view. Actually, a lot of the...

I have a few mountain roads beside me with 300 meter climbs and over 12% grades in places. My single hub yose 350w rear was just stalling on the climbs (my legs were not strong enough to keep it going) so I stuck a spare old mxus xf07 on the front to try it out. It was great, so I left it for...

1 ..I think most controllers (on the label) are rated in terms of battery current (often both continuous and maximum). By the way,motor current and battery current are the same once the motor is spinning fast e.g greater than 70%-80% of max speed. Its when the motor start to slow down under load...

Hi. The 'significantly sized inductor' is the motor winding itself. I have attached a good educational booklet explaining how these motors behave during pulse width modulation. Page 14 & 15 in particular gives some explanation of how this extra current occurs during the 'diode freewheeling...

I think there is some things people are forgetting. Firstly, to get more torque, (other than changing gearing) you always have to put more current through the motor, as torque is proportional to current. Battery current is not the same as phase (motor) current. The extra torque that comes from...

By the way, there is a huge 163 page discussion on KT controllers on endless sphere which included a way of hacking and reprogramming power levels etc. https://endless-sphere.com/forums/viewtopic.php?f=30&t=87870 PS. I find the gap between PAS 4 (50%) and PAS 5 (100%) a bit too wide. I would...

Cheaper.......When the bottle is empty, refill with 3 parts paraffin (kerosene) to one part motor or gear oil. Shake the bottle before use. Diesel or white spirits have been used instead of paraffin.

Strictly (mathmatically) speaking, a smaller wheel does not increase the torque. However, it does increase the thrust (horizontal pushing power) substantially, so going from 26 to 20 inch gives 30% more 'thrust' at the expense of about 30% less speed. e.g. and notice that blue line below...

Hi Andy. I have attached a (general) schematic of a KT controller.

Hi. The hi+ low flashing lights on 790 unit means there is something wrong with either the brake switch or its wiring or brake lever not sitting back properly. If you cannot visually see anything wrong, trace the cable from each of the levers to connector and disconnect one at a time, starting...

The above looks like mosfet short circuit in controller causing current to flow through motor winding when idle. Are you sure the controllers ok?

No. The 790 is probably OK. Other than visually checking over the bike to see if there is nothing obviously faulty/ all connectors fully pluged in etc., you are probably best to return to shop, as I think there is a two year guarantee with the electrics and the indications are that there is...

I use a 40 Amp (duel 2 X 20 diodes, controller is 14amp) Schottky and it works exactly as you said. It will pull more current from the higher voltage battery for only a very short period and then equalize. Indeed, I have forgotten on occasions to fully charge one of the batteries so there would...

The controller has a shunt and can measure and monitor the battery current. At start up, the current should be low as the motor is not running. (The mosfet are switched off). An abnormal high current points to a fault such as the mosfet faulty or possibly water in controller or damaged wiring etc.