Now let's back to the Project Y !
==== update 19 may 2009 ====
The battery is 40% finish... I am assembling the third 25V pack and will probably terminate assembly of the 4th pack tonight
I decided to go 28s4p instead of 30s 4p.. the reason is that at full charge the30s would give around 108V wich is risky with the 4110.. so using 28s would give me the exact voltage that i have now on my mongoose : 100.8V.
I'll keep the 2s for further upgrade and one of the secret weapon for beating that famous 58.6mph !!
The pack construction is going well and the soldering of the cooper sheet to link each 1s4p group is easy to do with my new 80W solder iron.. the bit have large cooper mass wich help to preserve the high temp for better soldering job!
I'll also need the BMS from Gary.. ASAP !!... (Hey Gary.. can you read that please
) to do my first test
I also had ordered a 5304 and a 18 mosfet controlelr (for backup) from crystalyte.. but i asked to replace the 5304 with a 5302.
i'll test first with the 5303 and then will switch to the 5302..
I want to see the difference between both at ultra high speed.. ( 90 -110km/h)
Theoricly with grear fairing.. the simulator would give me 107km/h with the 5303 and 145 with the 5302.... but i am realistic and will probably get something like 100-105 with the 5303 but i still dont know for the 5302 cause it is difficult to evaluate the torque needed to reach 90-105km/h... I know the 5303 can do it.. but the kV difference between the 5302 and the 03 is very high! so the 5302 could have not enough torque at that speed...
i've read that Ypedal had reached 45mph(74km/h) with a 5302 on a 20" wheel at 48V.. that's 150km/h at 100V !!.. but ....
OK.. now let see some pics of the battery construction: