batteries

LiFe batteries should work good in that temperature range. They can last as long as 5000 cycles if you don't discharge them too deeply.

Do you really need 200-300 hp? Most people go with about 50 hp peak... 200 hp is only needed if you are dragracing etc!

But 300 hp = 224 kW, and lets say you use thundersky batteries, that can pulse 5 C current, then you will need 44,8 kWh total energy storage in your batteries (independent of your battery configuration, but higher voltage is to prefer to minimize losses). That is a huge amount of energy, and it will cost. There are batteries than can discharge far more pulse current though!

Your range will depend on car and how you drive, but I would guess about 300 Wh/km to be sure! The 44,8 kWh battery would thus take you at least 150 km, but probably further.

ragnar said:

think you for your answers.. and yes i was thinking about a dragracing car.. I want to change my Renault Megane Berlingo II 2004 model into a RWD car with electric motor after maybe 3-4 years when the car will be not so expensive I think it will be a cool project and use it as a daily drive and as a track car only to play on.. so 150+km per charge is good.. but what do you mean by "They can last as long as 5000 cycles if you don't discharge them too deeply" is that I can charge them 5000 times if i don´t run them to low on volts..?


Best regents Ragnar / and a big think you jockepocke

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Cool, keep us updated!

It means they will last (have at least 70/80 or someting % of their energy storage left) for 5000 discharges/charges from 100% full to 30% full. If you disharge them less, they will last much longer!

Here are the numbers for some lithium batteries:
http://www.a123systems.com/a123/products

http://www.thunder-sky.com/pdf/2010723131435.pdf

http://lithiumstorage.com/images/SkyEnergy_100Ah.jpg

Oh, almost forgot! http://www.chinaheadway.com/en/productsh.asp?id=195

ragnar said:

Ok, so you seem to know a bit about EV cars and stuff.. I´m just a newbie so I have been looking for parts like motor and vacume for the breaks and control for the motor.. where can i get this all is there any online shop that sells every thing that i need? and has 2-300hp motors and batteries and control´s and every thing and maybe some instructions or simple blue prints of the setup i can see or can i get blueprints somewhere on the internet? to she the wiring and the setup..?

Best Regents and thanks. Ragnar

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There are lists of shops in the forum, and many shops also advertise on this site.
http://www.diyelectriccar.com/forums/showthread.php?p=80303

Searching the internet might help you find something good too!


About the wiring it is much up to you, but when you buy battery monitoring system, controller, motor, charger etc they will most likely come with wiring diagram. If you know a bit about electronics (many times what you learnt in school will take you further than you think) from before this should not be a problem! Actually the wiring in a dc-setup is simpler than many would think.

About the motor, that power might be hard to find, but with electric you can just allow more and more current to increase power, until your motor melts/burns

Many people use series wound motors for their huge torque capability, but I would recommend an AC setup if you can afford (they are more efficient and have no wearing parts) or brushless (about the same advantages). Compared to the series motor they also have the advantage of regenerative braking, which means you charge the batteries when slowing down, as the motor works as a generator. A sepex motor have higher efficiency and regen. as well, but are harder to find, especially in that power!

Buy a multimeter if you don't already have one! They come in VERY handy!