Sine wave vs square wave vs dual mode

[David Groen]

I have successfully converted my Sparta RX to run on generic components using the original front wheel motor. I have a Brainwave controller which does everything I need, but is rough under about 5mph. Many posts recommend KT sine wave controllers and LCD display which are slightly more expensive, but that's not a problem. The one I'm looking at is dual mode, but I can't find any info on whether this is square or sine, or if it will cure my low speed lumpiness. I'm using Hall sensors, I'm a gentle 250w commuter in flat Worthing so I don't need raw power or high speed.
Any thoughts before I shell out?

Ebike KT 36V 250-500W Electric bike dual mode 6 Mosfet Controller + LCD display | eBay

Model 6 Mosfet. With key lock function. Speed set 1-4.2V.

www.ebay.co.uk

 

[thelarkbox]

Hi, That ad is a bit 'fishy', Very good price for a 20a controller +lcd3, however Dual VOLTAGE controllers are very common, dual mode controllers ie sq-wave Or sine wave?? which is what i think that ad alludes to? I too would be asking questions.. - You could take a punt and if its a 'scam' rely on ebay returns /paypal refund..

do KT do a 20a controller?? i seem to recall 17a and 22a being the options to upgrade from 13-15a??

Myself i would probably pay the extra £10-20 or more for a 20a, and buy from a supplier like topbikekit, who detail everything in the ad descriptions leaving no ambiguity..

edit -- also 9x msffets is preferable due to better load distribution and heat dissipation.. 6x versions run hotter..

 

[saneagle]

It used to be ZWS in the designation number is sinewave and SVP is squarewave.

I'm not sure that KT are the best for some motors. I had rough running with a Q75 motor that I solved by adjusting the P1 parameter by trying various random numbers.

Some controllers, like the old KU63 and KU65 from BMSBatterywork well with any motors, but they don't have LCDs.