Search found 158 matches

by PaulM
Sep 21 2019 7:58am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Another GasGas trials bike conversion
Replies: 33
Views: 4405

Re: Another GasGas trials bike conversion

I got an OSET 12.5 for my son when he turned 4. Not long after that I got an OSET 20 for myself to ride with him. And then of course the missus wanted to join in so I got another OSET 20 for her. And another OSET 12.5 for visiting kids to ride with my son. He's outgrown the 12.5 so I got an OSET 16...
by PaulM
Sep 18 2019 1:32pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: another pit bike conversion qsmotor 2000w
Replies: 18
Views: 2471

Re: crf50 or similar conversion?

Did you do your rpm calculations with a 10" diameter? I believe that's just the rim size, I used an overall tire diameter of 15" and came up with 56 mph at 3500 motor rpm. Also, with that big of a motor, there won't be much room left for batteries in such a small frame. I don't want to discourage yo...
by PaulM
Sep 18 2019 12:32pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Another GasGas trials bike conversion
Replies: 33
Views: 4405

Re: Another GasGas trials bike conversion

I just picked up an OSET 20R myself; it's an amazingly fun little bike!!

Did you consider an OSET 24 at all? I'd like to find one but no used ones even remotely close to me and new is pretty expensive.

Best of luck with your conversion!
by PaulM
Nov 20 2018 9:09am
Forum: Battery Technology
Topic: Friendly reminder. Winter (@northern hemisphere) is kickin' in.
Replies: 5
Views: 669

Re: Friendly reminder. Winter (@northern hemisphere) is kickin' in.

Is it really that bad? Thousands of power tools are used and stored in unheated areas all winter. I have a dmm that lives in my car year round and it's still working. Where I work, we have to leave our phones in the vehicle so after a 12 hour night shift at -20 my phone isn't too happy but it's stil...
by PaulM
May 11 2016 4:48pm
Forum: General Discussion
Topic: How to remotely control pump engine?
Replies: 7
Views: 585

Re: How to remotely control pump engine?

Drunkskunk wrote: If your farm is run as a business, it would be highly illegal to use the RC frequencies for any business purpose.
I've never heard of this, please elaborate. The farm is a business.
by PaulM
May 09 2016 9:22pm
Forum: General Discussion
Topic: How to remotely control pump engine?
Replies: 7
Views: 585

Re: How to remotely control pump engine?

have wifi available? the RC stuff would work, but isn't going to be reliable. it also needs to stay in constant communication or it goes into safe mode. Belkin makes a web switch that can be controlled by a simple phone app. All you need is a wifi signal at the switch, then you can run it from anyw...
by PaulM
May 09 2016 5:22am
Forum: General Discussion
Topic: How to remotely control pump engine?
Replies: 7
Views: 585

Re: How to remotely control pump engine?

It runs about 10 hours a day, 6 days a year, so definitely not 24/7.

What is the purpose of the pwm triggered switches, can the receivers not provide simple outputs? Relays and actuators I have no problem with.

I'm not at the "how" stage yet, more "can it work"!!
by PaulM
May 08 2016 9:46am
Forum: General Discussion
Topic: How to remotely control pump engine?
Replies: 7
Views: 585

How to remotely control pump engine?

I'm looking for an inexpensive reliable way to remotely control a pump engine. It already has it's own manual controller so I just need to interface with it. I'm thinking a radio link with several inputs and outputs, like this: http://www.bwieagle.com/product/1000-wireless-remote-controls/44-40800-d...
by PaulM
Jun 11 2012 6:40am
Forum: Battery Technology
Topic: CBA II problem: stops test part way?
Replies: 4
Views: 432

Re: CBA II problem: stops test part way?

The two tests I did at home here worked fine, so it must be my work laptop causing problems. It was plugged in and I know it didn't hibernate or sleep, so it might be a problem with the USB port or the software. I think I'll just bring the batteries home and test them here; it's not worth time to so...
by PaulM
Jun 09 2012 6:43am
Forum: Battery Technology
Topic: CBA II problem: stops test part way?
Replies: 4
Views: 432

Re: CBA II problem: stops test part way?

This is the first I've seen this problem, although it has probably been 2 years since I last used it. I used to use it on an old laptop with no problems. The first test at work (also on a laptop) worked ok, but that was it. I will give it a try at home on the original computer I used in the past. Ba...
by PaulM
Jun 08 2012 7:39am
Forum: Battery Technology
Topic: CBA II problem: stops test part way?
Replies: 4
Views: 432

CBA II problem: stops test part way?

Has anyone had this problem before? Testing a few batteries at work has revealed this problem. The CBA stops testing only 1 or 2 Ah into the test, the Ah display shows "NaN", the current display is 0 or NaN, the voltage display is the actual voltage and the fan and both LED's are still on. Restartin...
by PaulM
May 09 2012 10:22pm
Forum: Alternative Energy
Topic: Removing ripple from DC current measurment??
Replies: 5
Views: 2658

Re: Removing ripple from DC current measurment??

Thanks again Luke, I used a 100 ohm resistor and grabbed a decent size cap from my assortment (2200 uF, 35V) and it seems to have worked great. The current graph is now very smooth and the data is actually usable now.
by PaulM
May 09 2012 6:28am
Forum: Alternative Energy
Topic: Removing ripple from DC current measurment??
Replies: 5
Views: 2658

Re: Removing ripple from DC current measurment??

Thanks Luke, I'll give that a try today.

We're not too concerned with measuring spikes or transients, it's mainly to get an idea of the power consumption and see how it compares to our solar input.
by PaulM
May 08 2012 7:12pm
Forum: Alternative Energy
Topic: Removing ripple from DC current measurment??
Replies: 5
Views: 2658

Removing ripple from DC current measurment??

I'm working on an off-grid solar system for work that is going to power some measurement equipment. It consists of 6 240W solar panels, a 60 amp Morningstar MPPT charge controller, an Outback 2.5 kW inverter and a 24 volt, 1820 Ah battery. To keep tabs on the system, we have installed a datalogger w...
by PaulM
Jul 24 2009 5:06pm
Forum: General Discussion
Topic: Alternators and gas powered charging systems
Replies: 12
Views: 1182

Re: Alternators and gas powered charging systems

If I just can't get it working with the stock parts I may slap a coreless RC motor on the chain. I assume you are using the CRF50 engine because you already have it? A few hundred watts won't be working it very hard lowering your efficiency. I would try to avoid going through the chain for efficien...
by PaulM
Jul 12 2009 5:51pm
Forum: E-Bike Non-hub Motor Drives
Topic: 20" Mariner w/3210-12T, a Nexus-3 hub and a 15s4p a123 pack
Replies: 65
Views: 9096

Re: 20" Mariner w/3210-12T, a Nexus-3 hub and a 15s4p a123 pack

GGoodrum wrote: Where do you find these larger sprockets? I've seen Horstman sprockets up to 85T, but these were the "split"/two-piece variety
I bought my 102T one-piece used off ebay, so it's possible they don't make them anymore, or maybe it was special order.
by PaulM
Jul 12 2009 8:19am
Forum: E-Bike Non-hub Motor Drives
Topic: 20" Mariner w/3210-12T, a Nexus-3 hub and a 15s4p a123 pack
Replies: 65
Views: 9096

Re: 20" Mariner w/3210-12T, a Nexus-3 hub and a 15s4p a123 pack

To make this work, I will use #35 heavy-duty go kart chain and sprockets. You can get sprockets up to 72T and McMaster has .375" motor sprockets in sizes from 9-13T. Nice work on the bike! If needed, #35 sprockets are available up to 102 teeth from Horstman. They are quite large though, especially ...
by PaulM
Jul 08 2009 2:25pm
Forum: E-Bike Non-hub Motor Drives
Topic: Project #3. Two motors, Three wheels, Six grand!
Replies: 182
Views: 25157

Re: Project #3. Two motors, Three wheels, Six grand!

recumpence wrote: Accelleration should be brutal.
If you can keep the rear tire from breaking loose . . . . :shock:

Could make for some awesome donuts though.

Looking forward to the video either way!!
by PaulM
Jul 04 2009 7:36pm
Forum: General Discussion
Topic: Captured some great lightning on 26 june in HD!
Replies: 10
Views: 1137

Re: Captured some great lightning on 26 june in HD!

Neat video! Lightning is one of Mother Nature's ways of showing us who's still the boss. Nothing like a close strike to get the adrenaline flowing either!! :D :shock: When I was younger we had one storm with a few strikes close enough to actually hear the sizzle of the arc before the thunder. Scared...
by PaulM
Jun 22 2009 4:55pm
Forum: Battery Technology
Topic: Batteryspace PCM/BMS Porn....
Replies: 11
Views: 1967

Re: Batteryspace PCM/BMS Porn....

that looks like a total of 40 X IRFP260N FETs. 200V 50A 0.04R. likely 20 are used as the charge switch and 20 for discharge. so the resistance of each switch is more like 0.002R per switch. looks impressive. looking forward to some test results and a critique. rick All those FETs are simply used as...
by PaulM
Jun 10 2009 5:55am
Forum: E-Bike Build Threads / Photos & Video
Topic: My Electric Racing GoKart :)
Replies: 4
Views: 1076

Re: My Electric Racing GoKart :)

Nicely done!!

Will you be racing any gassers with it?
What are you using for LVC?
by PaulM
May 21 2009 5:48pm
Forum: E-Bike Technical
Topic: Instant Start 18 fet Infineon Boards are here...
Replies: 970
Views: 144868

Re: Instant Start 18 fet Infineon Boards are here...

When the wife comes home for lunch I am going to get her to take a movie of me doing my (now infamous on my street) 0 - 30MPH burnout :P The on board vid had so much wind noise that it was pointless. You should do more of those burnouts Something all men would like to hear from their wives . . . :l...
by PaulM
May 21 2009 5:04pm
Forum: E-Bike General Discussion
Topic: bike helmet with face shield
Replies: 21
Views: 9051

Re: bike helmet with face shield

quick improvement, electrical tape. helmet2.jpg That's a neat idea! I wonder what it would look like with a tinted or mirrored visor . . . If bugs ever stick to it, try to resist the urge to wipe them off; I did that once while riding at night and now my visor has many little scratches in it :x
by PaulM
May 06 2009 6:00am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15124

Re: How To tune up the PWM frequency

Is there any reason they chose the low PWM frequency in the first place? If it's as simple as changing a couple components, why wouldn't they go with the higher frequency from the start?