Search found 642 matches

by 4Springs
Thu, 03 Sep 2020, 06:13
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

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: 54652

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: 146

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: 71132

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: 54652

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...
by 4Springs
Tue, 18 Aug 2020, 09:38
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

I drove it yesterday until the lowest cell reached 3.1 V under load. Then I drove the 1 km or so home after that. I managed 106 kM. Did you let the pack sit after that to see what the voltage settled to? This time I did, and found that the lowest cell had come back up to 3.17 v after about 30 mins....
by 4Springs
Tue, 18 Aug 2020, 09:32
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

I've made some adjustments to the BMS, and the charger is now charging to the limit, whereas previously the BMS was turning it off at a lower limit. This added a few extra kWhs to the pack, but it is still not fully charged. I took it for another test drive, and managed a more respectable total of 1...
by 4Springs
Mon, 17 Aug 2020, 19:25
Forum: Batteries, charging, management and monitoring
Topic: Caps over terminals?
Replies: 5
Views: 232

Re: Caps over terminals?

No, these are terrible. You should not use them at all. I can take them off your hands for you, please send them now!
by 4Springs
Wed, 12 Aug 2020, 05:35
Forum: Batteries, charging, management and monitoring
Topic: what is peoples thoughts on Active Equalizer Balancer Boards?
Replies: 16
Views: 1044

Re: what is peoples thoughts on Active Equalizer Balancer Boards?

Samsung SDI 63AH CELL Nominal Cell Voltage,3.7V Capacity 63AH Erergy WH 233 Cell weight, 1.8KG Cell dimensions, 175mm, 145mm, 25mm C rating 1.5C continuous 5C burst current Stud Size M8 Configuration was 8S 2P 63AH cells 2020-08-03 noon . . . . . . . . . . . . . . . . . . 2020-08-11 noon 4.02 . . ....
by 4Springs
Mon, 10 Aug 2020, 06:32
Forum: Technical and conversion discussion
Topic: tractor conversion
Replies: 37
Views: 2157

Re: tractor conversion

It really picks up nicely when you put your foot down too. The next video from YouTube had the tractor with its engine noisily idling away, it'll be much nicer to work around it once the conversion is finished. It makes me wonder why we don't have more commercial electric farm equipment already (bu...
by 4Springs
Mon, 10 Aug 2020, 05:38
Forum: Technical and conversion discussion
Topic: tractor conversion
Replies: 37
Views: 2157

Re: tractor conversion

pirpy wrote: Mon, 10 Aug 2020, 01:59 Zapi in pump mode, no regen, I need reversing and breaking contactors for regen.
Still 32 V
https://youtu.be/8LywRt-vLU8
Ah, that looks better. Nice demonstration of going quite slow.
I just noticed your signature and I'm impressed. I only have 2 cows!
by 4Springs
Sun, 09 Aug 2020, 19:01
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

But did the charger take the full 3.3 kW for all 11 hours, or nearly all? Usually the charge current and therefore power will taper off towards the end. Probably the full rate for the 11 hours, but with room for a little doubt. There are actually two chargers, and I can only monitor the consumption...
by 4Springs
Sun, 09 Aug 2020, 18:33
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

I did some measurements a while ago because the state of charge did not seem to match what was on the data sheet. ... So if you are stopping at 4v then you are probably only using about 50% of the capacity Now you tell me! If I use your table with my charging figures above, I only charged to about ...
by 4Springs
Sun, 09 Aug 2020, 18:16
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

Now I have some figures from charging this pack, to compare with the discharge figures. When I started driving (discharging), cell voltages were around 3.95 V. I need to fine tune the charging algorithm in the BMS to get them up a bit higher. I drove for 106 km, which I estimate to be about 20 kWh b...
by 4Springs
Sun, 09 Aug 2020, 08:14
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 316
Views: 54652

Re: 4Springs' Brumby

I've finally finished reassembling the battery modules. The cells are now 4 in parallel, 43 in series. Fully charged, this would be 179 V. But my charger doesn't charge that high, it cuts out at 172.2 V. This will therefore charge the cells to a maximum of 4.00 V per cell, or about 90% state of char...
by 4Springs
Thu, 16 Jul 2020, 18:51
Forum: Technical and conversion discussion
Topic: EV Ute Conversion - direct drive options
Replies: 9
Views: 393

Re: EV Ute Conversion - direct drive options

Mate, we at AEVA never discourage folks from embarking on a conversion project. Speak for yourself, I'm sure I've discouraged plenty of folks by sending them to my build thread! Here it is, the thread for my Brumby: https://forums.aeva.asn.au/viewtopic.php?f=33&t=2418 As Chris said, you'd need a mo...
by 4Springs
Sat, 04 Jul 2020, 06:43
Forum: i3
Topic: CCS1 Adapter Cable
Replies: 10
Views: 694

Re: CCS1 Adapter Cable

Ok, I reckon this is pretty interesting, so I made a news post on the main AEVA website. You can view it here: https://aeva.asn.au/news/fast-charging-your-bmw-i3/ Hopefully this advertises the idea a bit further. As a branch secretary, I send an email to our membership each month with these sorts of...
by 4Springs
Thu, 02 Jul 2020, 15:24
Forum: i3
Topic: CCS1 Adapter Cable
Replies: 10
Views: 694

Re: CCS1 Adapter Cable

I know someone who might be interested, but I'd need an indicative price.
by 4Springs
Sun, 21 Jun 2020, 15:10
Forum: Charging Infrastructure
Topic: We developed a charger. Please advise
Replies: 22
Views: 850

Re: We developed a charger. Please advice

The 1st gen EVs (leaf, imiev, i3, etc) came to australia with type 1 ports, so the first roll out of charge stations were type 1. There are still a significant number of type 1 charge stations in Australia, though no new ones are being installed. But are there any Type 1 sockets installed? The only...
by 4Springs
Wed, 17 Jun 2020, 18:57
Forum: Technical and conversion discussion
Topic: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4
Replies: 66
Views: 2150

Re: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4

I was just thinking about the cars cabin heater, since the motor is liquid cooled, i wonder if it would be possible to connect the cabin heater to the motors cooling system. Not sure how cold it gets where you are, but I can give you some real-world experience. On a cold day, my motor doesn't get a...
by 4Springs
Thu, 11 Jun 2020, 13:00
Forum: Technical and conversion discussion
Topic: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4
Replies: 66
Views: 2150

Re: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4

I have a 720 CCA Acid battery already in the car, and that can power my car fridge/freezer all night and still leave enough power to start the ICE in the morning, have been looking at Automotive deep cycle batteries as well, to replace the factory 12V system battery. found these https://www.century...
by 4Springs
Thu, 11 Jun 2020, 12:50
Forum: Technical and conversion discussion
Topic: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4
Replies: 66
Views: 2150

Re: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4

As always with EV conversions the biggest expense will be the Traction motor battery packs, On average I do about 150 to 160 Klm's a day for work, so i am going to require enough batteries to give me at least a 300 to 350 Klm's range, As you say, the biggest expense. Off the top of my head, 350 km ...
by 4Springs
Wed, 10 Jun 2020, 19:06
Forum: Technical and conversion discussion
Topic: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4
Replies: 66
Views: 2150

Re: Pro's & Con's of Converting My EFi 2000 Toyota Hilux 4x4 into an EV 4x4

Rob You mentioned: "Most EVs have a separate 12V battery for "house" electrics and charge that with DC-DC charger powered by the traction pack." Are these what you where referring to ? https://www.evworks.com.au/start-saver-battery No, Rob's talking about something like this: https://www.evworks.co...
by 4Springs
Wed, 10 Jun 2020, 18:32
Forum: Hyundai
Topic: 2020 Ioniq
Replies: 96
Views: 6773

Re: 2020 Ioniq

jonescg wrote: Tue, 09 Jun 2020, 21:49 Oh, the really good numbers are downhill. The higher numbers are uphill. There's about a 250 m elevation difference between home and work.
I was sure you were going to say that the good numbers are Katherine, and the higher numbers are Chris. :D
by 4Springs
Tue, 09 Jun 2020, 07:52
Forum: Technical and conversion discussion
Topic: tractor conversion
Replies: 37
Views: 2157

Re: tractor conversion

The Voltage is around 72 V. It's not so much getting the energy, back, it's maintaining constant rpm during downhill. In low gear you could easily explode the motor. This is a good thought! I'm also looking at converting a tractor, and I had assumed that DC was the only way to go. Here was my reaso...