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Search found 1103 matches

by T1 Terry
Sat, 25 Aug 2012, 13:53
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

Here is a Hi power cell with the side and top cut out showing the pouches. 2 in the case of this Hi power 100Ah cell but as the cell capacity grows so do the number and size of the pouches. The connections are clearly seen so the theory that one of these connections is a bit oxidised is viable in my...
by T1 Terry
Fri, 24 Aug 2012, 19:13
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

My theory, (a bit of a laugh for Monty Python fans) The 3.650v was enough to create sufficient voltage differential between the other cell pouches in cell 45 and the one with the oxidised contact to create a breakthrough path (no idea what the technical term would be). once the path was made the oth...
by T1 Terry
Fri, 24 Aug 2012, 16:09
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

"Any more specific advice about steps involved in charging idiv. batteries in this system? From a small voltage on a single cell sounds easy; But to the traction pack voltage of ~150W there is quite a difference, of course." I'm guessing you mean 150v, individual cells are still only 3v nom. each so...
by T1 Terry
Thu, 23 Aug 2012, 14:59
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

My theory: B45 is not fully charged, there is a high resistance joint somewhere, either at the terminal or internal. At around row 734 something happens, either the BMS starts to load the cell or the high resistance joint is over come by enough voltage differential, if I've got this part right it in...
by T1 Terry
Tue, 21 Aug 2012, 15:26
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

I can sort of explain why some cells are high and some cells are low, the charger looks at total voltage across all the cells and charges to an average, if a few cells go high during charging all the other cells must remain low for the average voltage to remain the same. I'm guessing the cells that ...
by T1 Terry
Tue, 21 Aug 2012, 00:20
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

My guess with the logger is it still had old files in memory and it ran out f space. We use 30 sec logging and can record for up to a week. You need to do the control shift and control alt to spread out the graph using the mouse wheel to find the 24hr points to separate the days but the graphs give ...
by T1 Terry
Sun, 19 Aug 2012, 22:58
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

Here is an example of exactly this problem with 3 week old pack under a 1C load ... These cells are in pack that has cycled 24/7 for over 12 mths now, they power my house and solar recharge. ... I don't use a BMS system as I have had issues with friends systems that not all the BMS boards discharge...
by T1 Terry
Sun, 19 Aug 2012, 15:25
Forum: Members Machines
Topic: barnard's Toyota MR2 - now Mr240
Replies: 213
Views: 29203

barnard's Toyota MR2 - now Mr240

I think the cells that drop voltage under load are simply not being fully recharged or able to hold full charge after each charge cycle, I assume that is what most other are suggesting. Here is an example of exactly this problem with 3 week old pack under a 1C load http://forums.aeva.asn.au/uploads/...
by T1 Terry
Mon, 18 Jun 2012, 20:31
Forum: The Lounge
Topic: Howto convince your partner to let U build an EV
Replies: 33
Views: 4845

Howto convince your partner to let U build an EV

Actually I've already trialled that using 5 lithium ferrous cells in series charged from nom 12v solar panels to recharge 4 cells of a demo pack. The results were outstanding, the limitation was the 1/0 cable used as it would only flow 85 amps but that was enough for proof of concept. I did try 4/0 ...
by T1 Terry
Sun, 17 Jun 2012, 03:45
Forum: The Lounge
Topic: Howto convince your partner to let U build an EV
Replies: 33
Views: 4845

Howto convince your partner to let U build an EV

Thanks Richo, that was it, now to find a copy.

T1 Terry
by T1 Terry
Sun, 19 Feb 2012, 01:04
Forum: Technical and conversion discussion
Topic: Using a Mosfet as a switch
Replies: 7
Views: 1274

Using a Mosfet as a switch

Thanks everyone. Using the relay to control an input rather than a load reverses everyhing but Eric's " Connect the most positive part of the of what ever you are switching to the "+" and the least positive to the "-" was the easiest for me to follow. It's also handy to know that the reverse flow wi...
by T1 Terry
Fri, 17 Feb 2012, 16:20
Forum: Technical and conversion discussion
Topic: Using a Mosfet as a switch
Replies: 7
Views: 1274

Using a Mosfet as a switch

thanks for the answers so far, I found a diagram of the relay, hope this sheds some light on the subject, I tried to post it earlier but my 'puter chucked a wobbly.
Image

by T1 Terry
Fri, 17 Feb 2012, 11:32
Forum: Technical and conversion discussion
Topic: Using a Mosfet as a switch
Replies: 7
Views: 1274

Using a Mosfet as a switch

When using a Mosfet as a switch, what affect if any would reversing the polarity of the source and drain have? I'm trying to use solid state relays as extensions for solar regulation and charge control and I'm getting rather confused as to which way around the connections should go if the relay was ...
by T1 Terry
Mon, 28 Nov 2011, 16:12
Forum: General EV Discussion
Topic: Newbie - Convert Ford Laser GL Wagon - or not?
Replies: 10
Views: 1974

Newbie - Convert Ford Laser GL Wagon - or not?

With the auto the motor can be running at a low speed when the vehicle is stationary, a little lossy but it will drive the air con compressor and power steering pumps so no additional items to buy there, just mount the originals with a few plates and brakets. No bump between acceleration and deceler...
by T1 Terry
Sun, 27 Nov 2011, 15:34
Forum: General EV Discussion
Topic: Newbie - Convert Ford Laser GL Wagon - or not?
Replies: 10
Views: 1974

Newbie - Convert Ford Laser GL Wagon - or not?

I have never seen one and I owned a mechanical repair workshop very close to the ford dealership right up till '98. That makes it rare enough to be worth bring back to life, plenty big enough to fit the batteries in, a future kid transporters and shopping vehicle that would cost little to run. Bein...
by T1 Terry
Sat, 26 Nov 2011, 21:16
Forum: Members Machines
Topic: Weber and Coulomb's MX-5
Replies: 1698
Views: 369435

Weber and Coulomb's MX-5

You could remove the extension housing on the gearboxes and swap over the worm drive gear on the output shaft. If you thought swapping the speedo gear mad a mess, you haven't experienced anything yet :lol: Might be a job for a workshop with a vehicle hoist. The ratio adaptor would probably be easier...
by T1 Terry
Sat, 26 Nov 2011, 13:56
Forum: Admin Notices
Topic: PM's
Replies: 10
Views: 2947

PM's

I was more referring to some sort of a flag appearing on the forum pages when I logged in to tell me there is a PM, I guess I missed the PM notifications in my emails, thankfully Weber sent me one a few days ago telling me about one of my typos (thanks Weber) and I saw the email notification for tha...
by T1 Terry
Fri, 25 Nov 2011, 11:06
Forum: Admin Notices
Topic: PM's
Replies: 10
Views: 2947

PM's

Has this problem with no notification of a PM been fixed yet? I just discovered I have PM's dating back mths and I have sent quite a few PM's and never received a reply, I'm guessing they have had the same problem, well I'm hoping that's why I never got an answer anyway    http://forums.aeva.asn.au/...
by T1 Terry
Thu, 24 Nov 2011, 22:58
Forum: Batteries, charging, management and monitoring
Topic: LiFePo for noobs
Replies: 6
Views: 1263

LiFePo for noobs

I have 720Ah of Winston cells @ 12v nom. as my house power supply. Yesterday morning the state of charge meter read 17%, there was a 25 amp load on the batteries and the terminal voltage was 12.9v, when the fridges cycled off the load dropped to 2.5 amps and the terminal voltage immediately climbed ...
by T1 Terry
Mon, 21 Nov 2011, 14:52
Forum: Scooters, mopeds and electric toys
Topic: electric bike kit supplier suggestions
Replies: 33
Views: 18371

electric bike kit supplier suggestions

Thanks David, The wifes bike is hub gears so no sprocket cassette to adapt to a rear hub motor. If the weight on the front wheel is an issue when riding it looks like I'm back to a belt drive for the left hand side of the rear wheel. Anyone know of a pancake motor type kit for this type of set up? T...
by T1 Terry
Mon, 21 Nov 2011, 13:07
Forum: Scooters, mopeds and electric toys
Topic: electric bike kit supplier suggestions
Replies: 33
Views: 18371

electric bike kit supplier suggestions

Hi David, Is yours a front or rear wheel kit? Do you find the weight of the hub adversely affects the feel/handling? An in hub kit would be the easiest to install but if it affects the ride feel then maybe the added effort of a motor and belt drive would be a better solution. The wife has a "pretty"...
by T1 Terry
Sat, 19 Nov 2011, 22:40
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 441
Views: 63682

Low cost BMS

Just on the drawing thing, a print screen and paste to power point is much easier to work with. Every thing can be moved around and size adjust, duplicated or completely deleted. The text boxes have spell checker and the saved JPEG file is much clearer from poer point than from paint.

T1 Terry
by T1 Terry
Fri, 18 Nov 2011, 18:54
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 441
Views: 63682

Low cost BMS

It would interesting to fit a cell logger across 6 cells and see if the voltage changed between cells while under load. Theoretically each block of 3 cells should remain the same voltage if they evenly shre the load, that is if I understand the whole thing correctly. I've tried it on my 4 x 90Ah cel...
by T1 Terry
Fri, 18 Nov 2011, 13:41
Forum: Electric motors and controllers
Topic: Kelly HIM, 156V induction motor controller
Replies: 10
Views: 2384

Kelly HIM, 156V induction motor controller

Once again I would say the downside is the max voltage. 156V will probably be the peak or fully charged battery pack voltage. IF you recharge to 3.6V per cell that is 43 cells or 138V nominal. This equates to around 100Vac. For a 4-pole with peak around 4500RPM this is a nominal motor voltage of 33...
by T1 Terry
Sun, 30 Oct 2011, 04:49
Forum: Batteries, charging, management and monitoring
Topic: Estimating Range
Replies: 6
Views: 1575

Estimating Range

Here is a chart from Fullriver for their 105Ah AGM batteries, it should be fairly typical, don't worry too much about the red circle and line, I think it was for a post on another forum to show the 50% SOC at a 1C discharge rate http://forums.aeva.asn.au/uploads/1713/Fullriver_DC105ah_2AGM.JPG T1 Te...