nasukaren's blog

nasukaren's picture

My blog is moving to my own website

I'm posting new entries on my continuing Boxer-EV saga on my own personal website blog:

Why? It's easier to post new entries using my desktop blog client (MarsEdit) and the VisForVoltage website is occasionally verrrrryyyy slow which is frustrating.

So please visit my site ( for further updates!

nasukaren's picture

Bill of Materials for EV moped conversion

Base Unit

Piaggio Boxer (1971)
- 50 cc 2-stroke internal combustion engine (removed)

Electric Motor

HXT 80-100-B 130Kv Brushless Outrunner from United Hobbies (link)

Electronic Speed Controller

Castle Creations Phoenix HV-110 (link)


Magura 0-5K Potentiometer throttle

nasukaren's picture

Piaggio Boxer-EV conversion (almost) finished

My replacement servo-tester finally came in yesterday (a saga in itself). I immediately tore it apart and replaced the potentiometer in it with a cable so that it could plug into my Magura throttle. The design of this replacement looks very simple. All discrete components: a 555 timer IC, rectifier, and some caps. I think I'll try to reverse engineer it so that I can just build it myself next time.

nasukaren's picture

Very very very short test run video

Let's see if inserting this Youtube code will work.... my friend Dave from the NEEAA giving my little Boxer a spin.

nasukaren's picture

Low-voltage DC-DC converter 16-75 VDC in; 12VDC @ 3A out

Here are some pics of the low-voltage converter that I created using the National Semiconductor LM2576HVT-12-ND buck-converter. The chip pretty much did everything for me -- all I had to do was to add two power-smoothing caps, a blocking diode, and a RF choke (which I mistaking undersized; promptly blew up and which I jerry rigged a loop of wire).

nasukaren's picture

Sunday Boxer

On Sunday, I finished making the bearing mount on the right side of the motor spindle. This will help take a lot of strain off the bearings on the motor and prevent it twisting out from the torque. Also, I shimmed the front pulley with the thin metal from an aluminium can -- it was just perfect to close the gap between 12.5 mm and 12.0 mm. As a result, the motor is working much quieter now -- I just love the sound it makes when it accelerates -- gotta post a video.

nasukaren's picture

Phoenix ESC Test Run 2

I put the Phoenix HV-110 ESC in the same aluminium project box that houses my low-voltage electronics. I mounted a temperature controlled CPU fan on it and ran the fan off the 12V line on the low-voltage converter.

The fan was in a "blow" configuration but I think I will change it to a "suck" config as I think that is more efficient for this type of fan.

nasukaren's picture

Phoenix ESC arrived and Boxer is happily boxing!

My replacement ESC from Castle Creations (the Phoenix HV-110A) finally arrived today, along with a Castle Creations USB programmer for it. The Phoenix HV-110A is considerably beefier than the ELF controller that I burned out. I reprogrammed the Phoenix using the very nice USB programmer (notably: BRAKING off) and installed it onto my Piaggio.

If you have the right QuickTime codec installed, you can watch a very boring video of my biking revving up to speed.

nasukaren's picture

Darn! I broke my Doc Wattson!

This is definitely not my karmic week. After burning out my ESC Friday, I was playing around with my e200 today and dropped my bike chain on my Doc Wattson. It fell on the LCD in a bad way and it cracked the LCD. Sigh...

Fortunately my credit card company has purchase protection, so I filed a claim with them. But it still means I gotta go order a new one.

And next time it comes, I'm putting a lexan cover over the LCD.


nasukaren's picture

Flea market find: a Razor e300 for $25

Today I visited my local flea market and picked up a real find. A used Razor e300 (or maybe e200, not sure) electric scooter with charger for the unbelievable price of $25.


Subscribe to RSS - nasukaren's blog

Who's online

There are currently 0 users online.

Who's new

  • chiefelivese
  • Casilat222
  • MKE_Z
  • charleyly
  • Boots eBikes

Support V is for Voltage