Hi Leigh,Hi All!
I have been following these forums for about a year now and I am considering taking the plunge and converting a vehicle.
I am aiming to convert a London TX4 taxi into an electric vehicle and I am hoping you can all help me out Specs here.
The main aims of my project is to have a vehicle that can:
- Range around the 100 miles.
- Have a 5C recharge time.
- Not extortionately expensive.
- Has a battery life similar or the same as LiFePo4.
I initially want to be able to use this vehicle as a personal vehicle but if it is successful I want to start a small business converting taxis in the UK!
One of my main aims is to have the vehicle fast recharge within 10 minutes, I am looking at a charge rate of 200Kw. I am looking to have a large battery unit at my house to power at these kind of rates.
Ideally I am looking at LiFePo4 chemistry battery's that can charge at 5C rates but I have seen other chemistries (such as Enerdel) which might be affordable (and available). I am looking for 80% DOD on the cells to extend battery life.
- Do any of you have suggestions of different manufacturers that are available at the moment?
- I know that CALB CA cells do 3C charging but could they do 5C comfortably with an 80% charge?
There is an issue with the vehicle running in the region of 2,500kg (5,500lbs) when the vehicle is completed. I am trying to get the vehicle weight down as much as possible but I reckon I will only be able to shed around 500kg maximum. Does this mean I will be running a pack at around 50Kw?
I plan to buy the DMOC inverter and Siemens AC motor from EVTV, I plan to have high Re-gen on the vehicle as I will be using it in the city and I will be start-stopping all the time.
I want to keep the charger externally to the vehicle (200kw) would be a crazy waste of space in the taxi (!)
Does anyone have a preferred charger that I can run several in parallel?
I know the SAE level 3 DC charging is proposed to have 400a and 400v charging ability so i would like to match that.
From there I was going to use a standard DC-DC converter the Borg Warner single speed transmission.
The main issue I will need help with is the weight and battery choices I need to work with.
If you guys have any suggestions I would be grateful.
That's an ambitious project. I'll comment on one aspect. I'm unsure as why you need a 10 minute charge, but at 200 kW assuming 100% efficiency, you will store 33.3 kWh. I doubt that will be sufficient energy for a reliable 100 mile range on the heavy vehicle in traffic with the required creature comforts. I suspect the charging system to be similar in complexity and cost as would be the vehicle conversion.