Here's a great link to why you shouldn't charge your NiMH packs in parallel: http://tlb.org/nimhboom.html
More info will be posted here as to how I'm charging my packs....
Piaggio Boxer EV: December 2009 Archives
I have the Prius NiMH batteries installed and test drove it but the snowstorm of 2009 has put the dampers on harder testing. In any case, here's the new revised bill of materials (BOM) (dated 2009.12):
| Base Unit |
Piaggio Boxer (1971)
- 50 cc 2-stroke internal combustion engine (removed) |
|---|---|
| Electric Motor | HXT 80-100-B 130Kv Brushless Outrunner from HobbyKing
- link to new version of motor - Tachs: 5600 rpm @ 43.2v nominal (4500 rpm @ 36v; 6000 rpm @ 48v) - Max amps drawn: 100A @ 43V - Max watts drawn: ~ 4300 watts - Speed: 45 kph top speed (at current gearing) |
| Electronic Speed Controller |
Castle Creations Phoenix HV-110 (link)
- 110 amps @ 50 volts limit |
| Throttle | Magura 0-5K Potentiometer motorcycle twist grip throttle |
| Servo Tester (Pot to ESC) | Boman Industries Polar-Matic PC-50 (ebay) |
| Power Monitor | Cycle Analyst (link) |
| Batteries | Currently SLA: Prius Gen 2 NiMH
- 6S2P packs (12 in total) - 43.2 volts nominal @ 13 Ah - 330 watt-hours (conservative) - Range: unknown |
| Power Connectors | - Anderson PowerPole 75A on main connections - link
- Anderson PowerPole 30A on sub connections - link |
| Wiring |
- 8 gauge stranded copper on main power lines and motor leads
- 12 gauge stranded copper on sub power lines |
| Lighting | - Front lighting using high-power Luxeon LED
- Rear lighting using high-power red LEDs |
| Low Voltage (12/5VDC) Converters |
|
| Things I burned out/destroyed |
|
When I first started building my Boxer-EV, the motor I installed in it was the largest brushless motor available for RC systems:
Model: HXT80-100-B Wire Turns: 8 Resistance: 32ohm Idle Current: 2A ESC Required: 130A Input Voltage : max. 48V Kv : 130 rpm/V Weight: 1570g Shaft: 12mm Voltage Range: 20-48v Non Load Current: 2.0A Maximum Power: 6500W Equivalent: 60-80cc Gas Engine
I've been very happy with it. With my 48 volt setup, I'm producing enough power that my drive belt started slipping -- so I reduced the gearing a bit to back off the torque. Still, vroom vroom.
ProgressiveRC.com has a great online list of RC brushless motors and you can sort by watts consumed. Looks like there are some great 10,000 watt motors (holy cowabunga!) the only problem being they are around US$2000 and above. My $130 + shipping RC motor is still on the top of the price/performance curve.
It looks like the dealer in Hong Kong I get things from has come out with a new version of the motor. The specs seem the same but they note: "Tight, thick copper windings and 48SH magnets make this motor a real powerhouse. The v2 motor also has screwed end-caps due to the amount of torque this motor produces!"
Model: TR80-100-B Wire Turns: 8 Resistance: 32ohm Idle Current: 2A ESC Required: 130A Input Voltage : max. 48V Kv : 130 rpm/V Weight: 1570g Shaft: 12mm Voltage Range: 20-48v Non Load Current: 2.0A Maximum Power: 6500W Equivalent: 60-80cc Gas Engine
Continue reading RC brushless motors.
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