AEVA Forums

Hi, it has been a while since I have been on this forum. However just letting people from Adelaide know that I have finally bought an i MiEV. I have had it for a week and done around 300Km already.
Rod.

Hi futurespec, Rick (I think) at ozscootersdirect.com.au imported and complied these scooters a few years ago. They don't sell them anymore, as far as I know. However, he might still be able to help you out. I bought mine from him, and I had no trouble getting it registered in South Australia (Austr...

Well it appears that my comments have at least got this blog going again. Regarding the issue of Aerodynamic drag and Cars vs Bikes: The formulae is Fd=0.5*ρ u^2 Cd A where Fd is the force of drag (Newtons). ρ is the mass density of the fluid (air in our case). u is the velocity of the object relati...

Hi, I hope you didn't think I was trashing your idea, as I was previously going down a similar path. Being an Electronic design engineer with a Power Electronics background, I was just offering some free advice based on my experience. I did have a project to convert a brand new SACHS 150 Express. Ho...

Unfortunately the reality of the Laws of Physics may clog up your pipe dreams. You can not simply apply a high voltage to a stock motor and expect to get more RPM, as the motor winding insulation will simply breakdown due to the higher voltage. Also the centrifugal forces increase with the square of...

Hi Sauron, Yes I have the same issues. I was originally going to flip the wheel over, (as it's a drum brake, no major swing arm mods). I was also going to use the clutch lever to control the rear brake, (scooter style). However I am quite enjoying having a foot brake at the traffic lights. The Clutc...

Hi Bevo, I'm pretty sure I can help with the answer. In those states where you can still ride a restricted motorcycle/scooter on a car license the motorcycle compliance plate must show the vehicle to be in "Category LA". Repowering the vehicle as electric, will not change the category of the vehicle...

Hi again, The voltage drop is most likely due to the negative temperature coefficient of Lead acid batteries which is typically -3mV per degree Celsius per cell. There are 6 cells in a 12V battery, and we have 4 batteries in series, hence the coefficient will be -3mV times 24 or -72mV. The 2.7 V dro...

Hi all, Balancing the Lead Silicone batteries will help prevent future damage due to overcharging of individual cells only if the overall charging voltage is correct that is between 54.0 to 55.2 Volts. Charging to 58.7 Volts (14.675 V per 12V battery) is overcharging even for a flooded lead acid bat...

Hi, The maximum current output is the same during "Full Charge" and "Float charge" modes. However it is the battery that determines what current it will accept at the particular charging voltage. At the float voltage the current will be lower, than at the higher but damaging "charge" voltage. This i...

Hi David, I don't think that should be happening. Can you check the charging current, and voltage on each battery? As you might have a high resistance battery, or an open circuit. Also I am concerned that the two 6.8V Zener diodes will discharge your batteries, as they are not very ideal devices. Fo...

Thanks for the Heads up Eric. Unfortunately at 25Kg, the D&D motor will be too heavy and too big for my motorcycle application. Also the effeciency is not great, as is the case with most motors with field windings, compared with permanent magnets. I will have to see if I can find out the particulars...

WARNING: This response is a bit long, and contains personal ranting. It is known that some early LP cells (white), (not the Yellow LFP LiFePO4 cells), had some "reported" problems (probably true). These were a different chemistry, so it is not likely to be relevant. <RANT> Also I know how easy it is...

Hi Matt, I was wondering what motor(s) you were thinking of going with for your Motorbike conversion. I'm planning on using 1 or 2 Perm PMG-132 motors, at 72V nominal. The best quote I have so far is $925 + $135 postage (USD). There is a possibility to save a bit with a larger order, although need t...

I have absolutely no idea about that. I would make a lot of sense though.
Regards Rodney

Hi all, I am also looking to purchase 24 Thunder Sky LFP90AHA batteries soon. I've had some quotes from Rod Dilkes at EV Power Australia Pty Ltd (www.ev-power.com.au Ph +61 8 97572998) being just under $AUD 1.50 per AH +GST. This is for 90+ AH cells. Apparently it is more expensive to buy the 40 and...

Hi, I also have a SWEI SW0008. The supplied charger appears to be designed for flooded Lead Acid batteries. It will overcharge your batteries , until it switches to float mode. In my case the upper voltage limit (about 58V, 14.5V per battery) used to detect "full charge" was not reached, not helped ...

Hi my is Rodney, I have just registered with this website. I have had an interest in EVs for many years. I am currently a Maths, Physics and Technology teacher, following a 10 year career as an Electronic Design Engineer. I currently own a Registered SWEI SW0008 Electric scooter, and I am in the pre...