I search to buy 72V KT controller or to modify my 48V one?

[crazymaster]

Hello!
I have 72V battery and bluetooth controller, but i dont like it because its without PAS options and without LCD...

So i want to use my old LCD3 and KT48ZWSRL 17A current 35a max Controller, but they are 48v... i tried to find online to buy one 72v KT controller in UK, but without success...

If somebody have one for sale - please let me know... or if somebody already made modification of his 48V one - please let me know details

 

[danielrlee]

Have you thought about adding a Cycle Analyst V3 to your existing setup? It'll give you the option of cadence or torque sensor PAS, an LCD display and a heap of other possibilities too.

 

[Nealh]

If you want 72v KT then the only real option is to get one from Aliexpress, other wise go for Daniel's suggestion.

 

[danielrlee]

If you want 72v KT then the only real option is to get one from Aliexpress, other wise go for Daniel's suggestion.

72V KT controller/LCD is also avaliable direct from BMSBattery. Not much help if you're looking for a UK supplier, but still an option.

 

[crazymaster]

Cycle Analyst V3 sounds ok... anyway i cant find it in UK too?
I am in UK only one more month... so i cant wait for slower delivery

Do you think that modifying current KT 48v would be easy enough? Only changing capacitors and probably transistors?

 

[crazymaster]

BMSBattery looks like they are in China... so it will take more time

 

[vfr400]

Check the ratings of the MOSFETs and capacitors. You'll most likely have to change the value of the big resistor/s that cut down the voltage to the 12V regulator. You also need to find the voltage divider that shows the battery voltage value to the CPU. Some KT controllers have jumpers for that bring in other resistors to change the values. Others only have the two resistors in the divider circuit. Some KT controllers can be adjusted by software, but you need the specific manual for your version to do that.

 

[crazymaster]

So at all it would be very hard probably...
I have attached some photos. if somebody have already done it maybe can help me... ?

 

[vfr400]

MOSFETs are only 68V. basically, you're out. Cheaper and easier to get a 72v controller.