Search found 598 matches

by 4Springs
Sun, 26 Jan 2020, 03:55
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 441
Views: 60276

Re: Low cost BMS

How did you go with the 200mA bypass current? 200 mA bypass current is good for my setup. 130 AH LFP. It takes a few minutes (perhaps 10-30) to equalise each charge. The charger reduces current during this stage so it is not delivering much more than 200 mA In the latest version I used 220 AH LFP c...
by 4Springs
Mon, 20 Jan 2020, 18:42
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

Finally finished a battery module! IMG_0371.JPG Screenshot at 2020-01-20 21-25-14.png So this is 30 cells, roughly 22 V, 7 kW, 30 kg. 5 cells in parallel, 6 in series. The main terminals are at the top. Other things you can see are: Black wires going to red/black Anderson connectors connect to the h...
by 4Springs
Thu, 16 Jan 2020, 17:14
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

So I read Francisco's comment and tested 2000 grit sandpaper. It takes off a bit of the layer, but not the whole lot: IMG_0366.JPG This was very similar to the scourer that I started out with: IMG_0367.JPG So I switched back to the scourer. The things in T1 Terry's link look quite similar, but onna ...
by 4Springs
Thu, 16 Jan 2020, 10:33
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

Only the copper tabs are nickel plated. I had a lot of trouble with contact overheating on the aluminium tabs until I removed the oxide and applied contact grease. Ah, thanks for the clarification. I'd started assembling without polishing. IMG_0364.jpg This stuff really does look like a plating. If...
by 4Springs
Thu, 16 Jan 2020, 06:11
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

I'm just starting to assemble these modules. I'm used to LFP cells, which have a tinned copper cathode, and an aluminium anode. I polish these immediately before assembly to remove any oxide coating. I went to polish one of these aluminium tabs, and it got duller instead of more shiny. Perhaps these...
by 4Springs
Fri, 10 Jan 2020, 15:09
Forum: Hyundai
Topic: 2020 Ioniq
Replies: 40
Views: 2396

Re: 2020 Ioniq

Interesting - this was the 38 kWh battery? Indeed it was - one of the people who ordered an Ioniq, had to wait and ended up with the new model. I've looked up the weather for that day. I'll use Hobart airport weather station. Temp Max 21°C, Min 10°C Windspeed max gust 60 km/h, more typically 30 km/...
by 4Springs
Thu, 09 Jan 2020, 17:25
Forum: Hyundai
Topic: 2020 Ioniq
Replies: 40
Views: 2396

Re: 2020 Ioniq

I had a ride in one of these to our last AEVA meeting. Two of us in the car. The meeting is 208 km away. On the way there we charged to 80% at a fast charger 41 km from our destination. We plugged into a 15 A outlet at the meeting, and the car was fully charged when we left for home. We made it home...
by 4Springs
Wed, 01 Jan 2020, 17:28
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

Are you making the BMS? I assume you are because it bolts to the end so you would have had to make the board to match the hole spacing. Yes, this is the second version of this BMS that I've made this year. The other one was for a home storage battery. That hole spacing is very tight! Looks like I'l...
by 4Springs
Tue, 31 Dec 2019, 18:43
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

Ok, based on Francisco's information, this is the battery module I've come up with. IMG_20191207_080955402.jpg I'm doing 5 cells in parallel. The module design allows any number of cells in series - you just need longer threaded rods if you want more cells. I'll be using two different size modules -...
by 4Springs
Wed, 13 Nov 2019, 18:16
Forum: Renewable Energy and Storage (Non-EV)
Topic: 4Springs' Home Battery Storage System
Replies: 15
Views: 2498

Re: 4Springs' Home Battery Storage System

SP Pro inverter/charger is in! IMG_20191112_130207146.jpg Installation took two electricians about 4 hours. We set it up with a Wizard which had an option for 16 LiFePO cells. This set quite intelligent values into the unit, which gives me a good place to start. The BMS is monitoring the cells, but ...
by 4Springs
Thu, 31 Oct 2019, 18:06
Forum: General EV Discussion
Topic: AEVA Sydney EV Expo and AGM
Replies: 3
Views: 663

Re: AEVA Sydney EV Expo and AGM

We need photos!
by 4Springs
Tue, 22 Oct 2019, 17:02
Forum: Renewable Energy and Storage (Non-EV)
Topic: AGM for home storage?
Replies: 6
Views: 769

Re: AGM for home storage?

Today I was just googling around and bumped into this AGM battery bank . And it's a lot under the price of a powerwall. But obviously it doesn't come with any BMS or inverter. And yes I'm aware that I'd need to keep the discharge to 50% for any real cycle life. A lot of the year our house uses just...
by 4Springs
Tue, 22 Oct 2019, 16:48
Forum: Technical and conversion discussion
Topic: EV Sticker for Number Plates
Replies: 56
Views: 10354

Re: EV Sticker for Number Plates

Interestingly (owning 3 EVs), I only received one set of stickers (for the Leaf). Nothing for the other 2. I wonder how accurate their records are... or were they were overwhelmed by so many EVs on their records that they had to send the sticker out in several batches? 😆 The new requirements are on...
by 4Springs
Fri, 11 Oct 2019, 18:03
Forum: Mitsubishi
Topic: 2020 Outlander PHEV
Replies: 5
Views: 736

Re: 2020 Outlander PHEV

coulomb wrote:
Fri, 11 Oct 2019, 07:45
A friend recently paid a deposit on a 2020 Outlander PHEV. It seems that they are claiming some 100 km of all-electric range.
So, based on the the claims made for the previous model, 60 km real world electric range. Perhaps 80 if you're going downhill.
by 4Springs
Sun, 06 Oct 2019, 05:07
Forum: Technical and conversion discussion
Topic: EV Sticker for Number Plates
Replies: 56
Views: 10354

Re: EV Sticker for Number Plates

This thread started in Feb 2013, now Oct 2019 and in all this time no one asked the ONE obvious question... WTF ??? I just bought a Kona and just found out totally by accident that my number plates are incomplete to the point where I could get a fine ??? I'm on the phone to Hyundai Monday morning t...
by 4Springs
Sat, 05 Oct 2019, 06:10
Forum: Renewable Energy and Storage (Non-EV)
Topic: 4Springs' Home Battery Storage System
Replies: 15
Views: 2498

Re: 4Springs' Home Battery Storage System

Is there room for more cells in that space or will you settle for the 22 kWh? Ah, you noticed that space, did you? The first design was just enough space for these cells. But a big cupboard shouldn't be much more expensive than a little one when it is being built locally, so I increased the size to...
by 4Springs
Fri, 04 Oct 2019, 18:49
Forum: Renewable Energy and Storage (Non-EV)
Topic: 4Springs' Home Battery Storage System
Replies: 15
Views: 2498

Re: 4Springs' Home Battery Storage System

If I'm doing a grid-connect system then I need a good battery box. I decided that I don't have enough time to make one myself, and do have enough money to have one made. So this is what I came up with: IMG_20190922_154736387.jpg IMG_20190923_164943686_HDR.jpg Made by a local sheet metal fabricator. ...
by 4Springs
Fri, 04 Oct 2019, 18:20
Forum: Renewable Energy and Storage (Non-EV)
Topic: 4Springs' Home Battery Storage System
Replies: 15
Views: 2498

Re: 4Springs' Home Battery Storage System

A year later, and a fair bit has happened. The most important thing is that I found an electrician who is willing to work with my 'home made' battery. This means that I can use the battery in a grid-connect system. I had previously thought that I'd be limited to a UPS style system since I'm not an e...
by 4Springs
Sat, 31 Aug 2019, 06:18
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

francisco.shi wrote:
Wed, 14 Aug 2019, 05:53
From what I have read up you need around 10psi minimum pressure to keep the cells from expanding during operation. That is about 270kg per pouch. I do not think 25kg extra will make much difference.
Wow - that is much more pressure than I had thought was required. Do you have a source for that?
by 4Springs
Sat, 31 Aug 2019, 06:16
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

Do you put a few batteries where the fuel tank was? I believe it is under the tray where your current rear batteries are and quite well protected. The fuel tank was underneath the tray at the rear. I am using that space now for the chargers. The original battery design (lead-acid) had two battery b...
by 4Springs
Sat, 31 Aug 2019, 06:01
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 30
Views: 3015

Re: How to tell a kilowatt hour from a kelvin week henry

I sometimes talk about the odometer on my car saying things like "It's done 60k km" I guess that is 60 Mm ? Like this post back in 2011: https://forums.aeva.asn.au/viewtopic.php?p=30690#p30690 Now I look at that post, I note that I didn't put spaces between the numbers and the symbols. Started out ...
by 4Springs
Sat, 31 Aug 2019, 05:47
Forum: Renewable Energy and Storage (Non-EV)
Topic: 3 phase supply but no 415v connections
Replies: 20
Views: 1297

Re: 3 phase supply but no 415v connections

brendon_m wrote:
Fri, 30 Aug 2019, 21:48
Scrap that, I have maximum dardiness.
Screenshot at 2019-08-31 07-45-22.png
Screenshot at 2019-08-31 07-45-22.png (23.22 KiB) Viewed 1247 times
by 4Springs
Sat, 17 Aug 2019, 06:12
Forum: General EV Discussion
Topic: Regenerative braking effect compared to traditional braking?
Replies: 6
Views: 787

Re: Regenerative braking effect compared to traditional braking?

This is interesting. I assume that regen cannot lock the wheels. This is because the retarding force is only applied when the motor is moving, and it gets less the slower the motor goes. If the wheels locked up then the motor would be stationary, and the regen wouldn't work. A sort of natural ABS. I...
by 4Springs
Tue, 13 Aug 2019, 18:38
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

For the back box could you rotate the cells so they are flat on the 310mm? That would fit the 137mm perfectly. Then either put more cells in the back box and less at the front or make the back box smaller. I would also keep the cells all together. The gap in the middle will make it really messy to ...
by 4Springs
Mon, 12 Aug 2019, 19:16
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 261
Views: 45140

Re: 4Springs' Brumby

How am I going to connect these cells together? Francisco has posted a picture of how he has done it: Francisco_Al.png His cells are three in parallel. What you can see here is three cells connected to the left side of an aluminium block, then the next three cells connected to the right side of the ...