AEVA Forums

It does sound like it could be a loss of motor current capability in the controller. 5 years is a bit young for a Curtis to start packing it in (most seem to go for about a decade) but if it has been running hot, that may have aged it faster. A lot of electrical components have their lives halved fo...

Normally, high resistance connections on the battery side of the controller have more of an effect at high speed - where power and hence battery current is higher - rather than low speed acceleration. At low speeds the battery-side currents are quite low compared with the motor currents, so in your ...

The Zeva precharger utilises a solid state relay for switching precharge. It's tough to get them rated for voltages much higher than that. However your circuit above would avoid that problem. Hi all http://forums.aeva.asn.au/smileys/smiley1.gif The CPC1968 I use in the higher voltage precharger is ...

Lapsed rego won't make much difference for the licensing process because when the time comes to get it re-licensed as an electric vehicle, the car has to pass a normal pit inspection anyway. You'd just have to get a Temporary Movement Permit to get it down to the pits if it is out of license. Howeve...

Hi all, I recently purchased an Alltrax AXE4834 motor controller from EV Works on behalf of a client for use in an electric trolley, but they ended up wanting more torque so I had to upgrade them to a controller with more amps on tap. As such I now have a spare AXE4834 here, near new, with only a mo...

Reminds me of an old saying: There are three types of liars in the world. Liars, damned liars, and battery manufacturers! It's a pity there's no regulation on claims of battery capacity. Wouldn't it be great if there was an online database of independent test results for all the various cells availa...

Seems like a reasonable hypothesis. I can confirm that damaging devices from shoot through as a result of diode turn-off being slower than transistor turn-on is a real danger when using gate resistors around 10ohms (relative to your 100nC gate charge). I've blown up devices in similar ways before. I...

Capacitive load hey... so, turn it into a proper buck converter with added output inductor, and switch faster (like 20kHz)? Edit: On further consideration, I don't see how a capacitive load could explain the blown freewheel diode as well as the IGBT. The load might have acted enough like a short cir...

This seems to be almost twice the consumption of higher efficiency AC motored EVs with regen braking etc. A point worth noting for the EV conversion industry. I think we're talking apples and oranges here. The Focus is not a small car. An more interesting comparison, I think, is with the production...

Hi TJ,

Rated for 60degC - a little marginal for a cooling circuit I'll admit, certainly couldn't use it to water cool an ICE, but it is probably good to keep EV gear running below this temp anyway!?

Hi all, I recently looked into getting a small pump for the water cooling circuit in my RX7, and after a bit of a hunt found a model with the right specs from a company called Tri-win. Unfortunately their minimum order was 5pcs, so I have 4pcs spare! So, does anyone need a cheap water pump (for moto...

Here in OZ, Huber Suhner may be an option. Check the Automotive Products catalogue link on the right of this page: http://www.hubersuhner.com/en/Products/Low-Frequency/Signal-and-Power-Cables e.g their "Radox" series screened battery cable, available up to 150sqmm. It may be hideously expensive thou...

Pretty sure that is the primary difference, the LEVs don't have a coil economiser so use a bit more power when energised.

I'm more a fan of the EV200. Using 2W instead of 15W for the coil means they run cooler and should last longer.

The manual does list "hardware over-current protection", so I wonder if it would do it if I dialed down the maximum current in the software? I think at the moment I don't have a maximum current set. That does sound like a hardware over-current system tripping. Most modern controllers have a softwar...

Kellys don't last long enough to be second hand http://forums.aeva.asn.au/smileys/smiley2.gif (Sort of joking, though I have witnessed a lot of failures over the years. Also the ones in the little silver cases lack the sustained power you need in a car, and the bigger ones seem to have a clumsy curr...

Oh man. I just need to vent.. After the driveshaft coupling came apart again a few weeks back, I had a new extra-beefy one made at great expense. Installed that today, went for a test drive, coupling seems good.. Then the Zilla packs it in again with the same old comms error which I thought was fixe...

The 0.47uF capacitor across IGBT probably isn't doing much harm nor good, except maybe harm to itself, and possibly a small amount of snubbing. Either way I'd be inclined to remove it, or put it in series with say a 10ohm resistor to make a proper RC snubber. What's your switching frequency? If you'...

Don't be overambitious Or accept that your project will end up taking longer, costing more, and with a higher chance of failures. Simple designs are easier to build, maintain, and are usually more reliable. Unless you enjoy extensive troubleshooting, it is best to use well-proven, off the shelf com...

Doesn't look like something that'd be too hard to make. Here's a piece of copper stock that might do the trick? http://www.ebay.com.au/itm/Copper-Bar-3-4-dia-x-250-mm-Steam-Sculpture-OG-/251255416967?pt=AU_Supplies&hash=item3a7ffd6887&_uhb=1#ht_500wt_1057 Edit: Or, get one of those 35mm ones and cut...

It is a very slick machine, I like it a lot. Way out of the price range of normal people, but a great demonstration of things to come. I look forward to the day when I can get a 4WD electric car with torque vectoring (or I might just have to make one). I think it is a shame though that the thing end...

It will be interesting to see how low you can get the current usage on this device. Adding any current draw at all to my 75mA will make the battery flatten even quicker. I note that according to the manual, the FGD+ draws about 35mA - so there is about half my usage! The low voltage cutout draws ve...

I certainly agree that the IOTAs are not an ideal solution, being originally designed to run off AC, and being far from weatherproof. But they've always been good value and have been used in a *lot* of EVs over the years, for the most part giving pretty reliable service. Back when I was with EV Work...

For the RX7 I'm using an IOTA DLS-55 HV DC/DC converter. I have two contactors in the vehicle, one (with precharge) for the motor controller, and an auxiliary contactor mid-pack (located at the +ve side of the rear pack) which effectively splits the pack voltage in half, and stops all loads on the H...

I'll get the prototype into the RX7 today and see how it goes. If it works as it should, I'm happy to send one your way for mates' rates http://forums.aeva.asn.au/smileys/smiley1.gif It basically has a comparator holding a power MOSFET closed whenever input voltage is above 12V, with a very slow res...

Hi all, First, the big news: The RX7 passed its pit inspection today and is officially road legal & licensed! http://forums.aeva.asn.au/smileys/smiley32.gif Not the most trouble-free process, quite a few hiccups along the way, but great to have this milestone done so I can start driving the car regu...