Power in Flux

What's on your mind?


[140]

Live Feed

Carnut1100 created the thread Motor selection advise wanted.
" Hi all.
Long time lurker, ex electric car owner (Mitsubishi i MiEV) and about to be bike converter...

I've got a Honda Hornet with a blown engine...originally fitted with MC22 engine from a CBR250RR but in a naked frame.
https://en.m.wikipedia.org/wiki/Honda_CB250F

My brother blew the engine racing an R6 over a mountain...
Bike is in good nick otherwise, and importantly it is free and LAMS approved (Learner Approved Motorcycle Scheme) which means I will be able to legally ride it.

To keep LAMS rating, an electric bike needs to be below 25kW.

Batteries are sorted, will be using lightly used pouch cells obtained at the right price from a friend.

Keeping chain drive so no hub motors, and I want a top speed of 130kmh at full tilt so I can use the maximum speed limit on local freeways of 110kmh without being at max.

Voltage will probably be 72-96 range depending on motor and controller chosen.

Budget for the motor is tight, cheaper is better, but a couple of hundred to make a difference between a slug and a nice bike is going to be found if needed.

From some reading I'm thInking the ME0913 with a Kelly KLS7230S might be a good combo...motor limited to 30kW peak, but controller limited to 21.5kW keeps it under the legal limit, and has regen capabililty.

Is there anything I'm missing?
Is there a better option? "

2 Hours Ago

Electro Flyers replied to the thread dc-dc booster.
" These are I think from the same company that makes your boost converter: https://www.banggood.com/MPT-7210A-A...p-1056572.html

I think they would be a good cheap, compact solar charge controller for a small dedicated PV set-up for charging a <72V EV battery system. I wonder if these could be put in series? Maybe 3 of them with separate panels charging 80V blocks of my 240V battery bank? "

5 Hours Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by Stevo View Post
http://www.ebay.com/itm/322374615632

Maybe if you wire 20 or so of these in parallel you might be able to get it to work ! LOL

Sent from my SM-T377V using Tapatalk
I would wire the necessary mean wells in series to get your 250 v once you establish a good stable output from the panels. Mean wells have isolated outputs

Sent from my SM-T377V using Tapatalk "

18 Hours Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by Stevo View Post
http://www.ebay.com/itm/301855582520

Look at this one. Way overkill for your current set up but plenty of room for future expansion. I can't tell what output current will be, but the 24 volts can be boosted up

Sent from my SM-T377V using Tapatalk
http://www.ebay.com/itm/322374615632

Maybe if you wire 20 or so of these in parallel you might be able to get it to work ! LOL

Sent from my SM-T377V using Tapatalk "

18 Hours Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by Stevo View Post
Sent from my SM-T377V using Tapatalk
http://www.ebay.com/itm/301855582520

Look at this one. Way overkill for your current set up but plenty of room for future expansion. I can't tell what output current will be, but the 24 volts can be boosted up

Sent from my SM-T377V using Tapatalk "

19 Hours Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by Electro Flyers View Post
Max~50V and 20A

Sent from my SM-T377V using Tapatalk "

19 Hours Ago

Electro Flyers replied to the thread dc-dc booster.
" Max~50V and 20A "

20 Hours Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by Electro Flyers View Post
Off topic, I'm looking for something to take variable V variable A input from a ~1kW PV array to charge a 240-250V battery bank. Would these work in series on the output? Are the inputs and outputs isolated? Any ideas?
At this price I don't think they are, but I'll shoot em an email. What kind of voltages and current are you getting from the solar Panels? Maybe if you send the power from the panels through a stabilizing voltage regulator, and then step it up to the 240 v with that output?

Sent from my SM-T377V using Tapatalk "

23 Hours Ago

Electro Flyers replied to the thread dc-dc booster.
" Off topic, I'm looking for something to take variable V variable A input from a ~1kW PV array to charge a 240-250V battery bank. Would these work in series on the output? Are the inputs and outputs isolated? Any ideas? "

1 Day Ago

Stevo replied to the thread dc-dc booster.
"
Quote Originally Posted by markcycle View Post
I had 2 of them self destruct trying to charge 14 leaf modules 114 volts luckily I get a refund
The ones I purchased were rated 900 watt, that's a joke. I set the voltage and current limit so it would put out no more than 600 watts and they blew in 3 minutes - both of them
What were you using for a source.? I had one hooked up to 2 deep cell wheelchair batteries in parallel and the other hooked up to a small 56 v 4amp charger.... both worked fine for 8 hours.
My meanwells just arrived today. These are just for a cheap emergency back up system I didn't have before.

Sent from my SM-T377V using Tapatalk "

1 Day Ago

markcycle replied to the thread dc-dc booster.
" I had 2 of them self destruct trying to charge 14 leaf modules 114 volts luckily I get a refund
The ones I purchased were rated 900 watt, that's a joke. I set the voltage and current limit so it would put out no more than 600 watts and they blew in 3 minutes - both of them "

1 Day Ago

cmcnall replied to the thread dc-dc booster.
" Don't do it! I have tried that exact one and a few others for my 98V chevy volt pack.
Your best bet is 2x 48V CC/CV meanwell 600w power supplies adjusted to the voltage you want placed in series.
The chinese DC/DC boosters are not rated for the load we are putting on them. I even when through the hassle of swapping all the diodes/transistors and caps for high rated versions.
I used 2x HEP-320-48A in my build, they have been solid. I should have bought them instead messing with all the other nonsense. One of those, trying to save money, wastes money things.
-Charles "

1 Day Ago

Hugues replied to the thread dc-dc booster.
"
Quote Originally Posted by Stevo View Post
I'm using a 58 volt dc source to charge 11 leaf modules to 92 volts
Interesting.
But you say you want on-board charging. So that dc-dc module will fit on-board. But what about your 58 volt dc source ? how big is that ? "

1 Day Ago

DRZ400 replied to the thread dc-dc booster.
" Use 3 cheap 36v scooter chargers in series "

2 Days Ago

Stevo replied to the thread dc-dc booster.
" I'm using a 58 volt dc source to charge 11 leaf modules to 92 volts "

2 Days Ago

milton replied to the thread dc-dc booster.
" May be a stupid question, but can you provide some more info on how you would use it? Just curious. Since its DC to DC so it would need a DC source for Charging! "

2 Days Ago

Stevo created the thread dc-dc booster.
" Hi guys. Since my charger crapped out a few weeks ago, I've been on a mission to find multiple alternative charge options for my 11 leaf pack. I dont like keeping my bike parked in the garage now that I can ride it to work!
I admit I've bought my share of chinese crap on ebay, but these booster boards are the real deal. Maybe because they come from Hong Kong??
I've been playing with a few of these using different dc power sources and so far they are standing up strong. They are well designed as they let you limit op current as well as voltage. I think they would be a very light and affordable way to add an on-board charger to my bike, although I'm not sure how they would hold up to road vibrations. So far, I'm very impressed
If anyone is interested:

http://www.ebay.com/itm/DC-DC-BST900...id%3D100102%26 "

2 Days Ago

milton replied to the thread AC-23 Motor not spinning with Curtis 1238 controller.
"
Quote Originally Posted by Hugues View Post
You'll probably need to ventilate your motor very well. I'm running 7.04:1 and I had to do the following:
- add 12v radial blower to force air into the openings on the shaft side to ventilate rotor
- add 12v fan underneath the motor to ventilate stator
- remove the bell shape cover to help the mechanical fan to suck air out of rotor

The controller also sits on heatsink which are ventilated by two 12v blowers which exhaust is blowing on top of motor.

Which belt have you used ? The Gates Carbon GT ? It has blue teeth, that's the only one which can handle this power in that width and pitch 8 (I presume).
Yes i got the Gates Carbon GT 1400mm length 8mm pitch. Here is the latest picture with the battries fit in. I have the batteries mounted but dont have a picture of that yet.

Still working on the ventilation aspect for the motor and Controller. Will probably have liquid cool for controller since its sitting on a chill plate. I was thinking of a heat sink as well but will decide on that after a trial run.

The motor's bell shape is outside the bike frame. so it should be good out there.. It might help adding a blower on the shaft side.

Attachment 7359Attachment 7360 "

2 Days Ago

DRZ400 replied to the thread Agni Motor short brush life?.
" Wow, $250 and 3-4 weeks for India! Maybe time to go brushless! "

3 Days Ago