E-Mountainbike Project - Page 2 - RC-Monster Forums

BL_RV0 · 09.14.2009, 11:11 PM

I don't have a 24v PS though. Mine's 13.8v and 8.5a. Works fine for me, so I have no plans to upgrade it.

J57ltr · 09.14.2009, 11:42 PM

That was just in case you wanted to charge both batteries at the same time or if you wanted to use the 18V battery.

Jeff

Metallover · 09.15.2009, 07:33 AM

I use a car battery charger to charge my pbs.

J57ltr · 09.15.2009, 09:16 AM

What kind, brand or model?

Jeff

riverat1540 · 09.15.2009, 09:48 AM

i have a mrc super brain 989 i use to charge all my stuff including pbs. i even used it to charge my real car battery when i was on a camping trip and left my lights on, and i was the only one there. im just lucky my cabin has an outlet. it will charge up to 5cells in lead acid mode, i believe each cell is 6v if i remeber right i dont use that setting much at all

J57ltr · 09.15.2009, 10:01 AM

2V per cell on Pb batteries.

Jeff

BL_RV0 · 09.22.2009, 10:40 PM

Ok guys, there's been a slight change in plans. Well, first off- I got my batteries! Woot! They're from my old e-scooter, 3 12v 12ah, but they work great. So here's the plan: It's gonna be the same motor and ESC, and still 24v even though I have 36v worth of batteries. I'm gonna ditch the sprocket I bought and the idea of running a chain down to the rear gear cluster. When I grabbed the packs, I also got the rear sprocket and freewheel. It's a 80t #25 sprocket, and a crappy but working freewheel. So what I'm going to do is mount the sprocket/freewheel on my crank, a much better plan IMO. All I need to make is essentially a large washer, a spacer to adapt the crank OD to the freewheel ID- not hard at all. I'm going to order another primary sprocket from mcmaster, as well as some chain. The sprocket is a 1/2" bore #25 14t sprocket. With the gearbox and that reduction, it will match my highest pedaling speed- about 25-30mph. With the planned gearing, and my ratio from my "foot-powered" sprockets, I'm looking at exactly 25.7mph. Perfect. The ratios are 16:1 (GB), 80:14 (primary to secondary sprocket) and 16:40 (pedaling sprockets, gear up)... Some pics for you to clear it up incase my explanation is fuzzy...

Here's the layout (old sprocket not being used still installed)

80t #25 sprocket

Where that sprocket is going

J57ltr · 09.26.2009, 12:39 PM

Quote:

Originally Posted by BL_RV0

Ok guys, there's been a slight change in plans. Well, first off- I got my batteries! Woot! They're from my old e-scooter, 3 12v 12ah, but they work great. So here's the plan: It's gonna be the same motor and ESC, and still 24v even though I have 36v worth of batteries.

Have you tried the 36volts worth of batteries with the 24v controller?

Jeff

BL_RV0 · 09.26.2009, 02:35 PM

I can't fit them on the bike frame or get the reduction I need to go anything less than 40mph with 36v.

J57ltr · 09.26.2009, 02:59 PM

Oh, Ok I thought you were going to use all 3 batteries.

Jeff

BL_RV0 · 09.26.2009, 03:01 PM

Nope. But I do have a 36v controller I might use for a different project.

Metallover · 09.22.2009, 10:43 PM

Are you going to support the end of the shaft of that gearbox?

BL_RV0 · 09.22.2009, 11:32 PM

Nope, but the pics make it look longer than it is, I'll probably just cut off the excess.

BL_RV0 · 09.26.2009, 10:30 AM

Mini update: 14t 1/2" bore #25 sprocket and 5ft of #25 chain ordered, scheduled to arrive monday.

09.29.2009, 08:59 PM

great build , i am just lurking here since i am thinking of getting a 3 wheel adult tricycle for my dad , and this is what i was thinking of doing with it

not to hi-jack but anyone who has any thoughts are welcome to pm me , but i am thinking of a tricycle for an adult with a similar setup (or a hub in the front wheel) so to it can still be used normal when possible , thanks