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  1. C

    ANT BMS 'Abnormal Start' error - SOLVED!

    Just thought I'd post this here incase anyone else is having similar issues with an 'Abnormal start' error on an ANT BMS... For context, I have a 24s ANT BMS protecting a 14s2p C020B cell pack and powering a SVMC72150 controller. The bike itself is going to be put through the UK MSVA scheme so...
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    Sabvoton not outputting full power even when set to

    I'll try these suggestions at the weekend but I've already maxed out the current settings and was only drawing 133A not the full 150. As I have no way of measuring the phase amps I can't verify that but didn't feel like it was giving everything. I also contacted the seller and they've sent me a...
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    Sabvoton not outputting full power even when set to

    Well I don't actually have the motor sensor wired up and the setting is disabled so that shouldn't cause an issue. I might as well try it for good measure though :)
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    Sabvoton not outputting full power even when set to

    I tried out the new throttle today, and no difference immediately so I can rule that one out. On the ride however, decided to muck around with the controller temp limits by setting them well over 100. I don't know if this was luck or what, but suddenly I had a lot more power. There's still...
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    Sabvoton not outputting full power even when set to

    There are two types of hall sensors, analogue and digital. The digital ones are in the motor to provide blips but the analogue ones provide a variable output for the throttle. I believe potentiometers are used in higher end throttles but as I said, I've had hall sensor throttles working before...
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    Sabvoton not outputting full power even when set to

    Hi Myles, The cheap throttles I have use hall sensors not potentiometers so I can only measure the output voltage, not the resistance. I'll try measuring the output with my meter and see if there's anything weird there, but I have a new throttle on the way today to see if that fixes it. It...
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    Sabvoton not outputting full power even when set to

    I tried the previous value of 167, and no luck. The motor still spun but still only 60A of current. I also downloaded an older version of the software that has more options for current limiting as I heard someone else solved a simialr issue through that but that didn't help unfortunately. I...
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    Sabvoton not outputting full power even when set to

    I set them both to 0v, tried both throttles and still no luck. I'm really scratching my head as I can't think what it could be. Only things I can think of are: 1. Bad hall test reading - if I can find my previous value, would it cause any dammage putting this in to try it out? 2. Faulty...
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    Sabvoton not outputting full power even when set to

    I redid it and got 192. Before however, I had around 170 or so and have even got 5 when running the test before so not sure what's going on there! Would it work to manually put in whatever my previous value was if I can find it?
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    Sabvoton not outputting full power even when set to

    Ok, got a strange issue here. I've gained a few months experience with Sabvoton controllers whilst building my current ebike (8kw enduro style) and taking it out down the road on test rides. Long story short, my first SVMC72150 died because of my stupidity with the phase wiring but I now have a...
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    Any harm with getting used Sur Ron levers?

    I was going to get Tektro HD-E710 levers for my road legal MSVA build, but there have been production delays and the seller gave me a refund. The only other brake levers I have found that meet the criteria of having ball-end levers and an oil gauge are the Sur Ron LB L1E levers. I already have...
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    Adding motor temp sensor to work with sabvoton

    I would use the KTY83 but they've been discontinued so I've done some more testing and found the resistor value should be around 16kΩ but will use a pot to fine tune it. I've found a similar PTC (same as the KTY83) sensor which I will try out soon. Thanks for confirming my theory
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    Adding motor temp sensor to work with sabvoton

    I'm trying to add a temperature sensor to my motor to work with a Sabvoton. Does anyone know how the sabvoton temp input works, whether it takes a voltage reading or measures the resistance directly? I've tried connecting it to my bench psu, but 0˚C is at 0.24v and 100 is at 0.48v which seems...
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    Lacing front mtb hub to 18" rim?

    Also wondering what size tyre to get. The seller lists it as 85mm across but as you can see it isn't actually. I have up to 4" clearance in the dropouts so was thinking of some 90/90 tyres like these https://www.tyretectrading.co.uk/cst-c6501-magsport-90-90-18-front.html ?
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    Lacing front mtb hub to 18" rim?

    Oh well, I've bought the spokes now but I'll remember that for the future. There's loads of clearance between the spokes and the spoke holes so that isn't an issue, I just need to redo it so that the angle of the spokes matches the angle of the rim hole. As I've started tensioning the spokes...
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    Lacing front mtb hub to 18" rim?

    12 gauge I think I'm getting somewhere and realised I wasn't threading the spoke under another spoke on the 'loose' side. I still don't think I'm doing it right as there is a lot of tension and the spokes still look bent. Hopefully the photos show the right angles but let me know if you need...
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    Lacing front mtb hub to 18" rim?

    I'm at the stage of my build where I am trying to build the front wheel. I've bought an 18" rim and a Vector hub (room for 2 discs https://vectorebike.com/bike/other/disc-front-hub).Once they arrived I took some measurements and have settled on 193mm spokes after deciding on doing a 2 cross...
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    Ebike ignition

    I use a sabvoton and there's a connector called 'e-lock' which disables the controller until the two wires are connected by the ignition switch. Your controller might have a similar connector or it might not need one in which case it isn't needed.
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    Does anyone have a broken Sabvoton?

    I was testing my motor a few weeks ago and used some jumper wires between the Sabvoton and the motor. I only found out after I 'killed' my sabvoton that one of the wires had a very high resistance so must have confused the controller into sending out power? Anyway, I've been diagnosing and...
  20. C

    Wheel won't move and screeches!

    Well this is embarassing... :lol: Turns out I was using a faulty wire between the VESC and the motor. Now the motor spins normally but the Sabvoton still got damaged somehow :confused: . I'm trying to figure out what's gone wrong. It seems to try to start up but then very quickly turns off and...
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    Wheel won't move and screeches!

    I need to add some ferrofluid to my wheel at some point anyway so I decided to practice getting the motor open. First I tried using a crowbar but popped off the wrong side (wire side) :roll: ! I then used a gear puller to properly remove the stator and it all seemed fine. There are a few...
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    18 vs 19 inch for ebike rims and tyres?

    Sounds like 18" is the better option for the better acceleration and wider availability. Thanks
  23. C

    18 vs 19 inch for ebike rims and tyres?

    I'm at that stage in my build where I need to choose the rims and tyres and can't decide whether to go for 19" or 18" rims. I was originally going to buy a set of rims and tyres that were 19" for the convenience, but I've looked around and found some good deals on 18" rims. I know Andy Kirby...
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    Is it ok to use 60v on a 48v breaker?

    Ok thanks, sounds like some good advice. Hopefully it will never actually be needed but it's not like I'm putting 200v through it so I think I'll stick with it.
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    Is it ok to use 60v on a 48v breaker?

    I'm thinking of putting a circuit breaker in series with my main positive power wire just in case the controller and BMS went bang, it would be an additional way of saving the battery. I've found this (https://www.carbuilder.com/uk/200-amp-surface-mount-circuit-breaker) which offers the current...
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