Originally Posted by Iain
LOL peddling at 70...
Id love to see that..
ok yes, 50 miles range is better I think at 50-70 mph you guys think?
a 2.5 kw pack, or more pertinently: what is the largest size pack I could get away with
You won't be able to do that on a bicycle. And I wouldn't try, at those speeds, it's dangerous not only to you, but others on the road.
To be possible, you could go 50-70mph on a motorcycle, you're going to be using between 100 and 130wh/mile, so you'd need at least 5kwh, but it could need to be up to 6.5kwh, but you want a bit over that because you don't want to discharge to 100%, so maybe 5.5-7kwh. There's no way you'd get 50 miles range with 2.5kwh of battery. And you'd almost 100% have to go with lithium.
Above 5kwh the pack gets harder and harder to fit into a normal 600-700cc sized motorcycle.
And that motor might have trouble hitting 70mph. 48V is a bit low for a motorcycle. Start thinking 72-96V.
Also, try to use the correct units. You're speaking about energy (how many kilowatt hours) but using units for power (kw).