E-Bike System

[mistercrash]

Super nice and clean Thomas. Looks very inconspicuous, but it goes over 60 I love it.

[zeropointbug]

I bought my kit at Grin as well Thomas. Their customer service is 2nd to none.

That motor looks like a new design! I am using the "FAST" kit, basically the lower wind core that was meant for a smaller 24" wheel... on 16s A123 I hit 55kph unassisted, but lacks any kind of torque, at least for me.

[mistercrash]

Following an idea I saw on ES, I bought 14 of these.

http://www.ebay.com/itm/310338999262...ht_4212wt_1188

And I'm going to try to make a charger that is basically 14 little chargers in one to charge my 14S scooter battery. Instead of using a hobby charger that charges at up to 20 amps and then goes into balance mode trying to balance the cells at 0.3 amp for 15 hours, charging each cell individually should be a bit faster even though it only charges at 1 amp and all the cells should still be balanced at the end.

Once I get the chargers and open them up to have the exact dimension of the boards, I should be able to find a project box to house all of them together in one neat charger. Positioning the LEDs so they are visible through hole in the project box. They turn red when charging and when they all turn green, I'm good to go.

Whadaya think?

[snellemin]

Originally Posted by mistercrash

Following an idea I saw on ES, I bought 14 of these.

http://www.ebay.com/itm/310338999262...ht_4212wt_1188

And I'm going to try to make a charger that is basically 14 little chargers in one to charge my 14S scooter battery. Instead of using a hobby charger that charges at up to 20 amps and then goes into balance mode trying to balance the cells at 0.3 amp for 15 hours, charging each cell individually should be a bit faster even though it only charges at 1 amp and all the cells should still be balanced at the end.

Once I get the chargers and open them up to have the exact dimension of the boards, I should be able to find a project box to house all of them together in one neat charger. Positioning the LEDs so they are visible through hole in the project box. They turn red when charging and when they all turn green, I'm good to go.

Whadaya think?

Any luck with the charger?

[mistercrash]

I received the single cell chargers and it would be fairly easy to make a box to house all of them in a neat package with the LEDs showing through small holes in the box. I thought that some 40+ pin connector from a computer could do the trick to connect a 20S battery. But I tried four of them to recharge 4 18650 cells. When all the LEDs were green, checking with my Fluke, I got 4 different voltages from the cells ranging from 4.27 up to 4.35V So I am disappointed that these little chargers lack the precision that I was looking for. So for now, unless there's an easy way to change something in them to make them cut off at the exact 4.2V mark, I'm stuck with 20 single cell chargers