volts

[mygrumpy001]

Hi all can you run a 36v system at 42v also what size wire from battery to controller thanks for any help given John

 

[trex]

John, all 36V batteries when fully charged show 42 Volts. Therefore, all 36V systems run at 42V and all the way down to 31V-33V when they usually cut off to protect the battery. Have you got a non standard battery?

 

[mygrumpy001]

Hi Trex Thanks got it wrong it is 44.4 i have a old road bike in very good condition and light have read that the bottle mount can break so was going to make a Lipo pack

 

[KirstinS]

You usually can overvolt most 36vcontrollers to 44.4v Always a risk of blowing but most take this without issue.

Lipo will be light. Take a look at hobbyking multistar packs. Perfect for ebikers. They have a low ish discharge rate for Lipo which makes them cheap. But it is more than enough for ebike purposes

It would be helpful to know exactly what Kit you have (and pics of any controller labels)

Personally I rate xt60 connectors, very waterproof, idiot proof and can take 60a !!

Don't forget you'll need balance chargers as your Lipo pack won't have a bms

Also Lipo carries extra risks so extra precautions. Not a plug and play solution

 

[KirstinS]

Also, I have broken bottle mounts on a steel frame. But only in a crash, not normal use

On a road bike with a a few cable ties it will be ok (unless. you stack it like I did !)

 

[mygrumpy001]

You usually can overvolt most 36vcontrollers to 44.4v Always a risk of blowing but most take this without issue.

Lipo will be light. Take a look at hobbyking multistar packs. Perfect for ebikers. They have a low ish discharge rate for Lipo which makes them cheap. But it is more than enough for ebike purposes

It would be helpful to know exactly what Kit you have (and pics of any controller labels)

Personally I rate xt60 connectors, very waterproof, idiot proof and can take 60a !!

Don't forget you'll need balance chargers as your Lipo pack won't have a bms

Also Lipo carries extra risks so extra precautions. Not a plug and play solution

 

[mygrumpy001]

Hi KirstinS The Kit is ElectricBike Conversions the controller is Model kt36zwsrt-lcd can you mix the volts to get 36 volts my charger only 1-4 cells John

 

[awol]

Hi Trex Thanks got it wrong it is 44.4 i have a old road bike in very good condition and light have read that the bottle mount can break so was going to make a Lipo pack

You could always go 10s 37v lipo pack.

 

[Ajax]

Out of interest what would happen if you tried to run a 36v motor with a 48v battery, or for that matter, a 36v controller with a 48v battery. Also assuming
i changed the controller from 36v to 48, and used the same 36v motor would it run faster or burn to frassle.

Has anyone had a bike live to ride the ride?

{Would the 36v throttle need to be changed to a 48v one? And here's a dozy, what if i changed to a 48v controller but kept using the existing 36v battery, would the controller convert the voltage from 36v to 48v, or would it simply not work, eg cut out because of the low voltage protection designed to save the battery?}

 

[Alan Quay]

It all depends. Generally speaking, most motors will survive a bit of overvolting, as long as you are careful how you use them.

Some controllers can be overvolted, but lots are 24/36v. If the controller is ok at 48v then you will be reliant on the batteries BMS for low voltage cut out.

Normally, throttles/pedal sensors/etch run at 5v so need not be changed.

 

[Ajax]

It all depends. Generally speaking, most motors will survive a bit of overvolting, as long as you are careful how you use them.

Some controllers can be overvolted, but lots are 24/36v. If the controller is ok at 48v then you will be reliant on the batteries BMS for low voltage cut out.

Normally, throttles/pedal sensors/etch run at 5v so need not be changed.

Its interesting you mention the throttles. Not long ago i had reason to buy a new key throttle. I opted for one listed as 36v.

Now it might be my imagination but it seem this throttle isn't as fast as the throttle it replaces. Given that there was a similar 48v key throttle, i'm left wondering if there is a real difference between the two.

I'm tempted now to get the other 48v just to see if it makes any difference.

http://www.ebay.co.uk/sch/m.html?_odkw=&_ssn=nice2boy&_armrs=1&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR0.TRC0.H0.Xkey+throttle.TRS0&_nkw=key+throttle&_sacat=0

There again, it could be that the only difference is the way they measure the battery charge remaining.

 

[Alan Quay]

Its interesting you mention the throttles. Not long ago i had reason to buy a new key throttle. I opted for one listed as 36v.

Now it might be my imagination but it seem this throttle isn't as fast as the throttle it replaces. Given that there was a similar 48v key throttle, i'm left wondering if there is a real difference between the two.

I'm tempted now to get the other 48v just to see if it makes any difference.

http://www.ebay.co.uk/sch/m.html?_odkw=&_ssn=nice2boy&_armrs=1&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR0.TRC0.H0.Xkey+throttle.TRS0&_nkw=key+throttle&_sacat=0

There again, it could be that the only difference is the way they measure the battery charge remaining.

You are correct, the only difference will be in the battery indicator. If you look in the item description it says that the small red wire is +5v.