arkmundi
10 MW
Update June-2013
Several things together - long trip, running down battery as much as I was comfortable with -and- charge it up with a kill-a-watt meter attached. Results:
Several things together - long trip, running down battery as much as I was comfortable with -and- charge it up with a kill-a-watt meter attached. Results:
- I ran it down about 15 amp-hour, or close to the expected capacity, figuring that to be about 18-19ah
- I was pleasantly surprised that even towards the end of my run, the voltage held; when I got back home it was around 39 volts still; I'd expected it to be down around 34-36 volts
- checked each cell and lol, they were all around 3.3 volts, within the spec; lowest was 3.2 volts; that was the most amazing stat, as with my prior experience and running without a BMS, I would have thought some greater range and that I might see a cell or two below 3.0 volts
- I got a kill-a-watt meter to plug my charger into, so I'd know exactly how many kwh it takes to charge up; this charge, for ~15ah replacement charge took 0.41 kwh
- I pay around 19 cents a kwh for my power at National Grid, using the Mass Consumer Energy greenstart label, so that's about 8 cents for that run
- I'm consistently getting about 1 mile per amp-hour on average, for my terrain and weight; so I'm figuring about 0.5 cents per mile; compare that to my Ford Escape Hybrid at around 30 miles to the gallon at current $3.524 per gallon, or 11.7 cents per mile
- like for those who want the hard facts on why local travel via ebike
- this run was down to Union Station for the train into Boston, then up to the State House to lobby my senator for H.2935Transition to a Clean Energy Commonwealth, then through the Emerald Necklace Parkway to the the Museum of Fine Arts to see the new film One Track Heart, the story of Krishna Das, then back onto the beautifully marked bike lanes of Boston to catch the train back to Worcester and home
- I love being more or less retired from working too much without children or grand-children or other relational preoccupations, so I can do what I want!
- I had no fewer than 5 kudos from people on the street for my bike; It's because of that crazy Cree blue LED light, back mounted, so its shinning directly on the hub motor, highlighing it - people know its an ebike just with a glance; one guy at the Backbay station: "I want that bike!" Look I'm not used to that kinda praise. No one for instance has ever said "I want that body" or "I want that mind" or "I want those clothes" or any such. But my ebike, yea, they want that!