Recent content by DerekG

Local Bike Shop has a demo they are selling... a 2007 Specialized Enduro SL Expert some upgrades with a bit of use for $2200... it was originally higher (listed at $4600 back in '07) they wanted $2500, however, I fought and got the price down to $2200. I think this is still a little high for an...

I too am interested in seeing this though if anything I think the cylindrical ones may do better??? 20aH of the cylinder ones rated at 30C continuous would mean 600amps continuous with burst up to 1000amps or so. Burst at 0 volts would make no sense and so I would expect them to perform better...

What I would do just to start out is put the batteries in series and get a controller which will pull the max number of amps the batteries can handle for now. (I didn't read what batteries you have now but I would keep it below 2C continuous for the smaller aH pack assuming they are the...

Sound like a lot of the issues you are having are due to the size of your wheel. If you ran a 26" then top speed would probably be around 25 or so on the flats although regen sounds like it would still be too strong from what I have heard elsewhere too. I would wait personally for the next...

It wouldn't be a problem , however, just know it is going to take a while unless you have a decent sized array of panels. I don't know a lot about solar as I live in a fairly cloudy valley however I will try to help :-) There are a few ways of charging off of a solar array... or so I believe...

Ehhh as long as you have a good BMS which watches each parallel group you should be fine. Cells are formed in the factory and are ready to go when you get them, however, taking it easy for the first few charges is my rule of thumb too... If you need at or above 80% right off the bat chances...

Incredible how long the A123 technology has been around (comparatively) and yet it still stands so strong :-) Very interesting how the headways have such a linear relationship between I and V vs the A123 curve

If you only need 15-20 amps continuous I would go with a 15 amp ping battery... cheaper and much easier to work with. The DeWalts I believe use A123 batteries which most people pull out and use to build custom packs. The ping batteries are rated at 2C so even a 15aH battery would not be taxed...

Best chance for crazy acceleration is going to be dual drive, A123 or Li-Poly batteries, and two controllers capable of 100amps each at 80+ volts :-P Even then think about what you want and whether it would make more sense to just go with a motorcycle. Speed is easy with a lot of voltage...

I was under the impression leaving it on the charger should be fine as long as you have a BMS capable of bleeding away any sort of trickle charge being applied. Most chargers meant for LifePO4 will cut current completely I believe, however, other chargers people have built should not be left...

I agree with what has been posted so far. All ebikes can climb... its just a matter of how well then can. Some can climb so quickly they can throw you off the back while others will probably stall if you don't help them up. If you want a decent climber you should look at a rear wheel. The...

Cool, welcome (soon) to the club of dual drives :-P Right now I have only a rear, however, until a few days ago was riding with only a front with a day of dual drive in the middle :-P Here are my thoughts on the matter: -I like front a lot better for powering into turn and also for...

Good to know :_) I'm PM'ing Stevo asking about the possibility of having a pack built for me using his used A123's... If I have a 6 or 8 aH pack even 50 amps peak would be less than 10C for it which should be fine as long as they are all genuine cells. Going to get a price from him although...

Yea, I have a single right now but it's still in a dorm so yea... I talked to a University Rep about Li-Poly and he said it's fine... no issues so that's back on the table too I guess (though they would have to be hard cases for impact resistance) Still, even with approval, it looks like an...

Thanks for the reply :-) In regards to selling my existing battery, if I should figure for a lot less than its worth more keeping the battery and using it as it is with the controller I have... everything stock still (because I still have a warranty on it and if I keep everything stock I know I...