Search found 53 matches

by Astroboy
Fri, 02 Jan 2015, 04:16
Forum: Batteries, charging, management and monitoring
Topic: Solar car cover
Replies: 79
Views: 4832

Solar car cover

I just submitted a note to Melbourne Airport supporting the addition of charge facilities.
I used their contact us page.
Hope it helps move the idea higher on their wish list.
by Astroboy
Fri, 28 Nov 2014, 02:36
Forum: Batteries, charging, management and monitoring
Topic: Solar car cover
Replies: 79
Views: 4832

Solar car cover

I do have some roofracks, and am investigating making up a calapsible ally frame that would hold rigid panels on the roof and down over the windscreen. The trick will be getting enough to get our 500watts, and have the whole thing fit in the boot and not take 1/2 a day to set up! As well as making ...
by Astroboy
Wed, 26 Nov 2014, 03:52
Forum: Batteries, charging, management and monitoring
Topic: Solar car cover
Replies: 79
Views: 4832

Solar car cover

Being the proud owner of an Outlander PHEV, and finding the staff parking company less than enthusiastic in setting up charging facilities at work, I am investigating the viability of a solar car cover. I would speak to the company's neighbours. There may be people more enthusiastic about electric ...
by Astroboy
Thu, 20 Nov 2014, 03:23
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

Huzzah! - the mid-pack contactor drops out in START! Which would not normally be the cause for celebration, but it is if you think you may have found the original problem that has caused you $4000 in repairs! ... That should give you some peace of mind. Now you can be confident that your current co...
by Astroboy
Sat, 15 Nov 2014, 06:18
Forum: Batteries, charging, management and monitoring
Topic: Veefill Good Design Award
Replies: 22
Views: 1778

Veefill Good Design Award

I am surprised there are no bollards in front of the charger.
How long will it be before a car accidentally mounts that small kerb and bashes into the charger?
by Astroboy
Sat, 15 Nov 2014, 06:09
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

...Then the next time you have to access the pack you could fix/modify the mid pack contactors setup to make it work with the ACC connection. ...but remember that in most cars the ACC is turned off while you START the car... 4Springs has his mid pack contactor wired so that it comes on with ACC but...
by Astroboy
Sat, 15 Nov 2014, 04:41
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

... Out of interest, the controller capacitor is discharged in my car by a circuit that powers a flashing red light. Arber gave me the idea - he said just use a plug pack power supply. This is really neat - I got an old phone charger made to run from 240VAC and connected it to the 150VDC. It produc...
by Astroboy
Sat, 15 Nov 2014, 01:31
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

So there is always current going through the pre charge relay and the controller caps are always charged? What turns the controller power off completely? The current only energises the precharge lockout relay while the controller caps get their initial charge. Once the caps are charged the drive co...
by Astroboy
Fri, 14 Nov 2014, 22:21
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

I may have missed something here but the way the circuit is drawn, the "precharge" relay always has controller current going though it. Therefore it always has less than 30 volts across it. As I said - sorry if I missed something obvious. While the capacitors in the controller are precharging the c...
by Astroboy
Fri, 14 Nov 2014, 02:54
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

So these tests narrow it down to something to do with START. My ON has 12V during START as well. My ACC does not. While writing this I have thought of something. My mid-pack contactor comes on with ACC and stays on at ON. What if it drops out during START? I'm pretty sure that there are some wires ...
by Astroboy
Thu, 06 Nov 2014, 05:01
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

I think this amended circuit should fix that problem. Without any addition of components either! Neat. http://forums.aeva.asn.au/smileys/smiley20.gif I won't bother putting in another LED in case of failure myself; my LED is already in place and having it fail would not cause the circuit to stop wo...
by Astroboy
Wed, 05 Nov 2014, 06:11
Forum: Electric motors and controllers
Topic: Simple Precharge Circuit
Replies: 21
Views: 3404

Simple Precharge Circuit

Nice setup, i like the use of a not ready light. I was puzzled by the precharge relay until i followed through your step-by-step description and realised it isn't what i would expect to be called a precharge relay. When i think of a precharge relay i think of the relay that controls the precharge cu...
by Astroboy
Wed, 05 Nov 2014, 05:21
Forum: Batteries, charging, management and monitoring
Topic: Problem TC Charger
Replies: 30
Views: 2633

Problem TC Charger

... Edit: oops, I forgot to mention that U1 and U2 are opto-isolators, with the "obvious" polarity http://forums.aeva.asn.au/smileys/smiley5.gif Edit2: Pins 6 and 7 refer to the 7-pin round connector. Also, it's important that you use a laptop that isn't grounded, or that the pack is well isolated ...
by Astroboy
Wed, 05 Nov 2014, 04:35
Forum: Technical and conversion discussion
Topic: Red Tape
Replies: 13
Views: 1776

Red Tape

Further thoughts... If the fault is the motor wires and its an AC motor type, then the fault current will be AC not DC and the multimeter in DC measure mode will not show AC current. Or if the charger has a fault and the AC input side is faulting to the DC battery output side. ... They say with the...
by Astroboy
Thu, 16 Oct 2014, 20:52
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

I am looking at doing something like that. A modified master board mounted near the battery pack doing Ah counting. It will connect into the comms line of the BMS. It would act just like the cell top modules. Waiting for a request from the actual master module asking for the Ah count and probably cu...
by Astroboy
Wed, 15 Oct 2014, 03:30
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

Finally finished enough cell top modules (53) to cover the number of cells going into the car (48). All built and tested. Here's some pictures of the result. Not shown in the picture is the many sleepless nights, strained eyes and singed fingers. http://forums.aeva.asn.au/smileys/smiley18.gif I used...
by Astroboy
Sun, 12 Oct 2014, 07:58
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 58
Views: 18149

Weber & Coulomb's LyteFyba BMS

Coulomb, that through hole piezo seems massive. Any reason for not using a much smaller surface mount piezo? If you could use a smaller piezo then you should be able to get the capacitor further away from the bypass (load?) resistors. Load resistors get quite hot and capacitors usually don't live lo...
by Astroboy
Sat, 11 Oct 2014, 07:29
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 58
Views: 18149

Weber & Coulomb's LyteFyba BMS

The snap off sections sound like a neat idea, especially with the number of load circuits reducing as each snap off section is removed. Less load for smaller capacity cells and higher load for larger capacity cells. Sounds good to me. Will be interesting to see the PCB. When i look at schematics the...
by Astroboy
Sun, 27 Jul 2014, 00:33
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

Maybe it would be best to have it on a trailer that could hook to different EVs and adapt charging... That way DMV couldnt say anything, since what you tow on a trailer is a cargo after all! most places having a motor running in s trailer when driving is illegal but i think this may get around it <...
by Astroboy
Tue, 15 Jul 2014, 05:06
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

Nevilleh wrote: I must say I'm enjoying reading this thread! Almost moved to do another car conversion.

So which car would you do this time?
Something you already have or something bought specifically to convert?
by Astroboy
Sat, 12 Jul 2014, 06:30
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

Couple of things. Firstly the sample 16F1847 chips i requested from Microchip arrived and one was used in yet another master module. (have built 3 now) And the chip is indeed a drop in replacement for the 16F1827. It even runs the hex file that was compiled for the 16F1827 without issue. So all the ...
by Astroboy
Mon, 07 Jul 2014, 00:48
Forum: Batteries, charging, management and monitoring
Topic: Can I fix my TC/Elcon charger myself?
Replies: 28
Views: 2934

Can I fix my TC/Elcon charger myself?

that is a poor attempt at cooling i must say but it is cheap adding a good heat sink at the manufacturing level would have only cost a few cents more and you would save a bunch in warranty clames i just dont get the way things are made these days pushing every thing to its limits i was always taugh...
by Astroboy
Thu, 03 Jul 2014, 05:16
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

@4springs I was just about to post a long winded reply (really, me?) when i re-read you comments and realised i misunderstood. I thought you were saying use the existing master module but you were saying use an additional/spare master board as the basis for the SOC sensor module. I would not have th...
by Astroboy
Wed, 02 Jul 2014, 09:32
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

... By the way I did have a comms failure "in the wild" a week or so ago. I don't have the display in the cabin with me, just the fault LED, so I rely on that to let me know if anything is (or has been) wrong. The only indication that there was a problem was that my fuel gauge was not showing full ...
by Astroboy
Wed, 02 Jul 2014, 09:22
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 384
Views: 39770

Low cost BMS

Huh that is not a bad idea actually. LEM would be mounted on a side PCB powered by 12V. Optocouplers would be used to output signal to cell comms for isolation. You could also use a boost converter to fully supply 5VDC from one cell. Only i dont know how much it drains. You dont want that cell unba...