Advice needed.

[slow worm]

Hello, I bought a converted carrera with a 350 watt yose rear hub motor recently, it's got the C500 display and a yuishi 18 amp max controller, I've found the advanced settings and turned the max amps up to 18 amps, it does a little over 20 mph on the flat but because I work out in the sticks I decided to add a 250 watt yose front hub motor I have two throttles and use the front hub only for steep hills, it works surprisingly well but me being me wanted a little extra oomph, I've bought a luishi 18 amp max controller but the display julet plug is slightly different, one end has an extra pin, any ideas? I was thinking of upping the max amps to 16 or 17 amps for short bursts, batteries aren't a problem because I'm running 3 with a combined total of 46 ah's.

 

[thelarkbox]

Yikes thats an unusual config. what hills terrain do you cover that needs the 2nd motor??

you can run some controllers headless (without a display) by throttle only by shorting the pins #1 (red wire battery voltage), and #2 (blue wire, 'start') to turn it on. if julet(waterproof) plugs/sockets, the keyword 'pinout' in a search should get you where pin-count starts from..

So you could install a switch to make the above connection on demand and wire up the one throttle to both controllers. Throw the switch to engage/disengage the front motor when you come to the big hill or spot a plod and need to exit stage left pdq.

Personally id pull the 350w motor and run within the regs the 18a controller with a 250w motor only but im boring and like having insurance etc..

edit imho 18a max current setting will have little effect on a 250w motor running on the flat, but if labouring at a slow speed up a long hill over a mile or more could suffer from overheating .

 

[saneagle]

When you run with two motors, the torque from the back one lifts the weight off the front one, so when you put power on the front one it loses traction and spins, so you shouldn't go too high on the power of the front one..

If you want to run with two motors, you only need one throttle and one pedal sensor. You run a branch off each of the signal wires only to the second controller. The other wires aren't necessary and they'll cause problems if connected. You should also link the grounds if you're using more than one battery if you want to run with single throttle and PAS.

A good way to run two motors is to use the PAS for only the rear and the the throttle for both. In that case you can use a cheap dumb controller that has no control panel for the front one, which saves money as is less complicated.

Whatever you do, make sure that you have well-anchored torque arms on the front motor if you have aluminium forks. The slipping and gripping of the front wheel puts a massive strain on the drop-outs.

 

[slow worm]

Yikes thats an unusual config. what hills terrain do you cover that needs the 2nd motor??

you can run some controllers headless (without a display) by throttle only by shorting the pins #1 (red wire battery voltage), and #2 (blue wire, 'start') to turn it on. if julet(waterproof) plugs/sockets, the keyword 'pinout' in a search should get you where pin-count starts from..

So you could install a switch to make the above connection on demand and wire up the one throttle to both controllers. Throw the switch to engage/disengage the front motor when you come to the big hill or spot a plod and need to exit stage left pdq.

Personally id pull the 350w motor and run within the regs the 18a controller with a 250w motor only but im boring and like having insurance etc..

edit imho 18a max current setting will have little effect on a 250w motor running on the flat, but if labouring at a slow speed up a long hill over a mile or more could suffer from overheating .

Yes, I get the overheating thing but it is only for maybe 30 seconds at a time, I'll test it out at 15 amps as soon as it stops raining and it'll probably be adequate, I'll avoid overloading it at slow speeds which would definitely make it go bang, I live in Wales so it's quite hilly and less pedalling is preferable after a twelve hour shift, I'll get my brain around your reply when I'm off next week, thank you.

 

[slow worm]

When you run with two motors, the torque from the back one lifts the weight off the front one, so when you put power on the front one it loses traction and spins, so you shouldn't go too high on the power of the front one..

If you want to run with two motors, you only need one throttle and one pedal sensor. You run a branch off each of the signal wires only to the second controller. The other wires aren't necessary and they'll cause problems if connected. You should also link the grounds if you're using more than one battery if you want to run with single throttle and PAS.

A good way to run two motors is to use the PAS for only the rear and the the throttle for both. In that case you can use a cheap dumb controller that has no control panel for the front one, which saves money as is less complicated.

Whatever you do, make sure that you have well-anchored torque arms on the front motor if you have aluminium forks. The slipping and gripping of the front wheel puts a massive strain on the drop-outs.

Thanks for the reply, I have two throttles but only one visible display, I'm going to fit handlebar muff things which will hide the visible throttles and the front display, if in an unlikely event I do get pulled I can switch the display off covertly and hopefully blagg my way out of it, I'm middle aged and I don't look like the average stealth bomber pilot, all the gubbins is concealed in my hardly noticeable top box, I'll definitely look at torque arms though, thanks for the reply. Ps, is the C500 display different for 250 watt and 350 watt yose motors, I'm thinking it must be because of the sixth pin.

 

[saneagle]

Thanks for the reply, I have two throttles but only one visible display, I'm going to fit handlebar muff things which will hide the visible throttles and the front display, if in an unlikely event I do get pulled I can switch the display off covertly and hopefully blagg my way out of it, I'm middle aged and I don't look like the average stealth bomber pilot, all the gubbins is concealed in my hardly noticeable top box, I'll definitely look at torque arms though, thanks for the reply. Ps, is the C500 display different for 250 watt and 350 watt yose motors, I'm thinking it must be because of the sixth pin.

Are you talking about the number of pins on the main harness at the controller end or on the display. I've never seen 6 pins on a C500. If it does have 6 pins, the 6th would be for the lights.