Search found 662 matches

by 4Springs
Yesterday, 17:57
Forum: Electric motors and controllers
Topic: DC Motors - Shunt?
Replies: 17
Views: 189

Re: DC Motors - Shunt?

Speed control is quite simple. I presume all inverters take a torque command (at least the leaf and my inverters do) and will send speed feedback. All you need to do is have a set point for your speed work out the difference between your set point and the speed feedback from the inverter and multip...
by 4Springs
Thu, 03 Dec 2020, 04:09
Forum: Electric motors and controllers
Topic: DC Motors - Shunt?
Replies: 17
Views: 189

Re: DC Motors - Shunt?

Does it have to be a new motor? Could you use a 2nd hand ev/hybrid motor and inverter. I know EV wrecks are hard to come by in Australia but might be an avenue to look down. Might even be worth the freight to import something Good point. A single Outlander motor would probably be a good size. Outla...
by 4Springs
Wed, 02 Dec 2020, 17:56
Forum: Electric motors and controllers
Topic: DC Motors - Shunt?
Replies: 17
Views: 189

Re: DC Motors - Shunt?

I think Kelly do some half bridge controllers that can support regen on DC motors, but only for PMDC. SepEx can do regen but need a different sort of controller again. Shunt and Series DC motors can't do regen because there's no permanent or separately excited magnetic field for the rotor to spin i...
by 4Springs
Tue, 01 Dec 2020, 18:30
Forum: Electric motors and controllers
Topic: DC Motors - Shunt?
Replies: 17
Views: 189

Re: DC Motors - Shunt?

Ok, so from the comments above it looks like a DC motor could be used in this application, as long as the controller can handle regen current. Let's look at prices. I've found some examples from the EV Works website. All out of stock, but the list prices give an indication. For instance the Zeva MC1...
by 4Springs
Sun, 29 Nov 2020, 06:11
Forum: Electric motors and controllers
Topic: DC Motors - Shunt?
Replies: 17
Views: 189

DC Motors - Shunt?

I'm intending on converting a tractor to electric. Tractors have some specific requirements that are a bit different to cars, so I'm looking at motor options. I'm wondering if a shunt wound DC motor would be suitable. Tractors use a hand throttle, you set it at a particular position and then leave i...
by 4Springs
Sat, 21 Nov 2020, 16:40
Forum: Other
Topic: Hilux conversion
Replies: 18
Views: 284

Re: Hilux conversion

francisco.shi wrote: Sat, 21 Nov 2020, 16:11 You are using a brushed motor right?
That would make it use up a bit more power and you wouldn't get regen braking.
Correct, and a good point. This is a very flat area, and I don't think that regen is really worth it for me, but it can make a difference for some folk.
by 4Springs
Sat, 21 Nov 2020, 13:02
Forum: Other
Topic: Hilux conversion
Replies: 18
Views: 284

Re: Hilux conversion

I want to put enough battery into it to have an effective range unloaded of 400Km+. As I understand it I will need about 75kwh of battery and serious motor. My smaller ute (I kept the 4WD) gets about 25 kWh/100 km. So I'd need 100 kWh to go 400 km. Your ute is larger, so probably worse aerodynamics...
by 4Springs
Tue, 17 Nov 2020, 12:13
Forum: General EV Discussion
Topic: Life Cost of EVs and the government take...
Replies: 28
Views: 473

Re: Life Cost of EVs and the government take...

I agree with your reasoning, but struggle to understand why people are trying to compare the Kona EV with the ICE Kona. The shape is the only thing they have in common. To 80km/h, I have given a hard time to Golf GTI and big V8s. Although I have never tried the ICE Kona, I’m pretty sure it can’t do...
by 4Springs
Sun, 15 Nov 2020, 07:20
Forum: General EV Discussion
Topic: Life Cost of EVs and the government take...
Replies: 28
Views: 473

Re: Life Cost of EVs and the government take...

I did some back of the envelope numbers for the Kona, but not as detailed as yours. I like your emphasis on what tax is taken, I think that would make a good basis for an article. For our 35,000 annual kilometres the break-even was about 7 years. Our electricity was priced at 9c/kWh though, which is...
by 4Springs
Sat, 14 Nov 2020, 14:29
Forum: General EV Discussion
Topic: getting small business to share their powerpoints
Replies: 17
Views: 298

Re: getting small business to share their powerpoints

AEVA developed a series of brochures some years ago to help you approach businesses. This one is a nice introduction, and includes a bit on Plugshare: https://aeva.asn.au/files/146/.
by 4Springs
Mon, 26 Oct 2020, 06:32
Forum: Batteries, charging, management and monitoring
Topic: Chargers being turned off
Replies: 19
Views: 499

Re: Chargers being turned off

I have had to turn chargers off when they are charging at full pace and have had nothing go wrong. That may have been just good luck! Me too. Lately, I've been turning power outlets on and off with a timer to charge during off peak times. I've done this with an Outlander EVSE, a Gelco EVSE (both ty...
by 4Springs
Tue, 20 Oct 2020, 17:51
Forum: Hyundai
Topic: Urgent advice for Kona EV owners
Replies: 21
Views: 596

Re: Urgent advice for Kona EV owners

You'd think they'd be passionate and informed about the cars they sell. Certainly not in my experience! A recall is not a particularly unusual thing, it's not like they'd all be running around panicking. For instance this one, also Hyundai, also potential for a fire, also recommended 'don't park in...
by 4Springs
Sun, 11 Oct 2020, 08:29
Forum: Hyundai
Topic: How many Kona or Ioniq EVs in Australia?
Replies: 13
Views: 494

Re: How many Kona or Ioniq EVs in Australia?

Label your axes Chris!
by 4Springs
Fri, 02 Oct 2020, 05:37
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 626
Views: 70628

Re: Prelude conversion project - some questions

jonescg wrote: Thu, 01 Oct 2020, 08:17 Which is good, as this gives me a decent location to start filling the whole thing with encapsulating resin.
Will you encapsulate the connecting plates as well? Or leave those un-potted and open to a cooling breeze?
Are you talking plain old resin, or some kind of thermally conductive goo?
by 4Springs
Sat, 26 Sep 2020, 15:28
Forum: Charging Infrastructure
Topic: Destination chargers for Motels, etc: Suggested install?
Replies: 8
Views: 985

Re: Destination chargers for Motels, etc: Suggested install?

Nagaman wrote: Sat, 26 Sep 2020, 15:16 Yeah I’m hoping the mods fix it.
I'm a bit slow. Didn't realise what a mod was! Finally realised that I am one....
by 4Springs
Sat, 26 Sep 2020, 13:28
Forum: General EV Discussion
Topic: EV Charging Space Etiquette
Replies: 22
Views: 866

Re: EV Charging Space Etiquette

Chuq wrote: Sat, 26 Sep 2020, 09:38 This is another option that I've seen around recently: https://www.needtocharge.com/
Ah, it even works if you're not signed up!
I just sent you a message without having an account myself. Sorry, but you knew it would happen...
by 4Springs
Sat, 26 Sep 2020, 06:00
Forum: General EV Discussion
Topic: EV Charging Space Etiquette
Replies: 22
Views: 866

Re: EV Charging Space Etiquette

Regarding Charge space etiquette, I wish people would leave a card on their dash with name & phone #. It would be nice knowing how long you may have to wait (particularly in the single car NRMA stations in outer/rural areas). Checking in on Plugshare.com is a ready-made way of doing this. You can n...
by 4Springs
Mon, 21 Sep 2020, 06:14
Forum: Hyundai
Topic: Has Anyone Swapped Out The Nexen Tyres on Kona?
Replies: 33
Views: 2166

Re: Has Anyone Swapped Out The Nexen Tyres on Kona?

Trying to work out whether to change out the tyres on delivery or not (at least I might get something back for the Nexen tyres). Another vote for doing it on delivery. Without actually testing this, I reckon our Kona has a greater stopping distance than our 1992 Brumby. Wide, soft tyres on the Brum...
by 4Springs
Sun, 20 Sep 2020, 08:18
Forum: Hyundai
Topic: Frunk/Froot for Kona
Replies: 32
Views: 4140

Re: Frunk/Froot for Kona

I don't know about where you are but the local libraries near me have 3d printers and you can go there with a usb and they will print stuff for you. Its dirt cheap as well, basically just the cost of the filament. Thanks for the tip! It turns out that there is a 3D printer in the public library in ...
by 4Springs
Sat, 19 Sep 2020, 15:36
Forum: Hyundai
Topic: Frunk/Froot for Kona
Replies: 32
Views: 4140

Re: Frunk/Froot for Kona

I bought a 30 litre container from Bunnings, 3D printed some posts that use the rubbers from the engine cover to mount to the car. The 3D printed posts have slots for aluminium bars 2mm X 25mm , unfortunately Bunnings sell 1mm and 3mm bars so I had to double up the 1mm bars. I will modify and print...
by 4Springs
Thu, 03 Sep 2020, 06:13
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 57197

Re: 4Springs' Brumby

What is the cell voltage when fully charged? 4.02 - 4.03 V So not full (4.166 V). This voltage should equate to about 90% if you believe the published specs, or about 50% if you believe Francisco's table. I'm putting in about 35 kWh out of the rated 40 kWh, or 87%. There are two ways I can see to i...
by 4Springs
Wed, 02 Sep 2020, 19:24
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 57197

Re: 4Springs' Brumby

With the balancers operating all the time, how do you determine the difference between cell voltage and cell capacity? Is the cell voltage and charge capacity linear like a lead acid cell, assuming ther is no surface charge involved? I'm not sure that the difference is of any consequence, and yes, ...
by 4Springs
Thu, 27 Aug 2020, 07:45
Forum: General EV Discussion
Topic: Vehicle servicing by dealer, or find another option?
Replies: 14
Views: 498

Re: Vehicle servicing by dealer, or find another option?

Hi to everyone, I'm in Perth and have a MG ZS EV on order arriving some time in the next few months. The question is do I get it serviced by the dealer or do I go looking for an alternative as I live in Joondalup about 35km. North of the dealer? I'm always a fan of the local mechanic. We don't quit...
by 4Springs
Tue, 25 Aug 2020, 19:36
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 443
Views: 73342

Re: Low cost BMS

One weakness in the calibration algorithm that I've implemented is that it is stored in volatile memory. So if the board is ever disconnected, or if the watchdog timer reboots it, it will lose the calibration. I've learned a bit more about the PIC microprocessors, and I'm now using non-volatile sto...
by 4Springs
Tue, 25 Aug 2020, 18:58
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 57197

Re: 4Springs' Brumby

Does your BMS sense high cell voltage to stop the charging as well as the total battery voltage? Yes. The way it was set up with LFP cells was that it would turn the charging current down when the first cell reached the voltage at which it started bypassing. The lower charge current was about the s...