{"product_id":"electric-bicycle-controller","title":"KT-22A Brushless Motor Controller for E-Bikes, 36V 48V 500W","description":"\u003ch2\u003eThe bike stopped pulling on the hill, and the motor was not the part that failed.\u003c\/h2\u003e\n\u003cp\u003eIt is almost always the box, not the hub. The controller sits in the frame or under the rack, takes the battery in at one end, and decides how much current goes to the motor. When it goes, the wheel spins freely and the display still lights up, which is the moment most owners find out their bike has a controller at all. This is a replacement for that box: a finned metal shell about the size of a paperback, four screw tabs on the corners, and a loom of leads out of one end.\u003c\/p\u003e\n\u003cp\u003eThe white label on the case reads Controller for brushless motor, and lists rated voltage, rated current, a low voltage cut off, a speed set line and a low level brake input. The maker names the model KT-22A, describes it as a square wave controller with nine power tubes, and rates it at DC 36V and 48V for 500 W. The leads end in the sealed round plugs the trade calls waterproof connectors, and one spare connector is packed with it.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCovers two battery voltages\u003c\/strong\u003e The maker rates the unit at DC 36V and 48V, so it suits the two systems most mid power e-bikes are built around.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNine tube power stage\u003c\/strong\u003e The maker counts nine power tubes on this model, which is what sets it apart from the six tube controllers in the same case family.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSealed style connectors\u003c\/strong\u003e The loom ends in waterproof type plugs and one spare connector is included, so a damaged plug does not mean a new controller.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtection lines on the label\u003c\/strong\u003e The case label names a low voltage cut off and a low level brake input, both standard e-bike wiring points.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinned case with mounting tabs\u003c\/strong\u003e Four screw tabs and a ribbed metal shell, made to bolt into a frame box rather than dangle from cable ties.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e the owner or the shop replacing a dead controller on a 36V or 48V brushless e-bike, who already knows how their existing loom is wired.\u003c\/p\u003e\n\u003ch3\u003eWhy It Works\u003c\/h3\u003e\n\u003cp\u003eA square wave controller switches the three motor phases in blocks rather than shaping a smooth sine, which is why this type is cheap, simple and easy to source as a spare. The number of power tubes is the honest measure of how hard it can be pushed, and the maker gives nine on this one. Everything else is wiring discipline: phase leads, hall leads, throttle, brake cut off and the battery pair all have to land in the right plug. Fitting it is a wiring job rather than a plug and play swap, so it rewards someone comfortable matching a loom. Keep a photo of your existing wiring to match plug for plug, since connector colours vary between builders.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Product Facts:\u003c\/strong\u003e KT-22A square wave controller; case label reads Controller for brushless motor; rated voltage DC 36V and 48V; rated power 500 W; nine power tubes; label lines for low voltage cut off, speed set and low level brake input; leads terminated in waterproof type connectors; ribbed metal case with four screw tabs; pack holds one controller and one waterproof connector; best matched plug for plug to your existing loom.\u003c\/p\u003e\n\u003ch3\u003eHow It Fits Your Routine\u003c\/h3\u003e\n\u003cp\u003eThe first job is not fitting, it is checking. Open the frame box, photograph the existing loom before you unplug anything, and compare plug for plug with what arrives. Ten minutes with a phone camera saves an evening of guessing which yellow lead is which.\u003c\/p\u003e\n\u003cp\u003eOnce it is in, the routine is that there is no routine. A controller that is bolted down, sealed at the plugs and running inside its voltage band is a part you never think about again. Keep the spare connector with your tools rather than in the box, because the day you need it will be the day a plug gets crushed by a pannier.\u003c\/p\u003e\n\u003cp\u003eIf the bike lives outside, the fixing matters more than the electronics. Bolt it through the tabs, keep the loom pointing down so water runs away from the plugs, and do not leave the case resting on a wet frame member where it can sit in a puddle.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this for a brushless or a brushed motor?\u003c\/strong\u003e The label printed on the case reads brushless, and that is the spec we follow here. Confirm your own motor is brushless before ordering so the controller matches your build.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my bike?\u003c\/strong\u003e It is sold on its ratings, so match it to your bike by voltage, power and the plug layout of your existing controller. Any 36V or 48V brushless build with the same loom is a candidate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fit it myself?\u003c\/strong\u003e Only if you are comfortable identifying phase, hall, throttle and brake leads. The leads carry battery current, and a wrong connection can destroy the new controller, so if any of that is unfamiliar, have a bike shop do it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it waterproof?\u003c\/strong\u003e The connectors are the sealed, waterproof type. Mount the case out of standing water and keep the loom pointing down so water runs off the plugs.\u003c\/p\u003e\n\u003cdiv style=\"width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;\"\u003e\n\u003ctable style=\"border-collapse: collapse; min-width: 480px; width: 100%; font-family: Arial, sans-serif; border: 1px solid #ddd;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color: #f2f2f2; padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eFeature\u003c\/th\u003e\n      \u003cth style=\"background-color: #f2f2f2; padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eModel\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eKT-22A square wave controller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eMotor type on the case label\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eController for brushless motor, per the case label. Confirm your motor is brushless before ordering\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eRated voltage\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eDC 36V and 48V\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eRated power\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003e500 W\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003ePower stage\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eNine power tubes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eLabel functions\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eLow voltage cut off, speed set line, low level brake input\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eConnectors\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eWaterproof type plugs on the loom\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eCase\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eRibbed metal shell with four screw tabs\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eIn the pack\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #fafafa;\"\u003eOne controller and one waterproof connector\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eFitting\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px; border: 1px solid #ddd; background-color: #ffffff;\"\u003eA wiring job. Match phase, hall, throttle and brake leads to your existing loom, photographed before you unplug\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Moko Boutique","offers":[{"title":"22a waterproof controller","offer_id":43038936531038,"sku":"SU00366698-22a waterproof controller","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0639\/7031\/2286\/files\/d322646a-e391-417d-a153-30e9347b6e05.jpg?v=1784673406","url":"https:\/\/www.moko.boutique\/ja\/products\/electric-bicycle-controller","provider":"Moko Boutique","version":"1.0","type":"link"}