 Electric bike pack
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Conundrum
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
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Thread hijacking is not a problem, thanks for the safety tips.
I have the D-E brand LiFePO4's, 1.3Ah but a lot of the cells are damaged.
If anyone has any of the 18650's spare I'd be interested, please PM me.
One way to help reduce the chances of a flaming mess is to install the pack in a LiPoSack and only ever hold the cells at 50% (storage) and store the rest of the power in a second pack.
This also helps with degradation in storage, sometimes its nice to take the big heavy pack off and use one's legs for
a change.
Another feature I may be adding to this pack is wireless charging, 300mA for 9 hours is most of a full charge.
Easy to do, just use a solar panel and shine a waterproofed infrared "daylight" security panel at it from an upstairs window.
See 
Also an outdoor solar box with infrared charging built in would be handy for charging up other devices.
I found some "3W" IR 940nm diodes on Ebay for £3.49 each, they need cooling but the excess heat can be converted back into power or used to keep the wavelength stable.
These are wide angle but a simple lens should fix that and adding active feedback means no matter where the bike is parked it will charge with a little loss in extremes of weather.
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