Search found 583 matches

by 4Springs
Sat, 08 Feb 2020, 17:28
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 247
Views: 43884

Re: 4Springs' Brumby

I'd go with the PET sheet because it gives you electrical isolation as well. The aim is the keep the cells above 0*C when charging and I believe the PET sheet will not conduct the cold from outside the way the aluminium would and therefore provide a more even heat. I've gone with the PET - mainly b...
by 4Springs
Sat, 01 Feb 2020, 13:58
Forum: Hyundai
Topic: Hyundai Kona road Noise
Replies: 11
Views: 563

Re: Hyundai Kona road Noise

Hi All, Within a week I sourced 2 rolls of Jaycar AX-3687 sound deadening and put it all around on the metal in the boot area and over the metal area just behind the back seat. I was careful to leave the plastic shield over the sticky mastic near any wiring, so the sound deadening did not stick to ...
by 4Springs
Fri, 31 Jan 2020, 18:35
Forum: Hyundai
Topic: KONA EV tailgate story
Replies: 9
Views: 390

Re: KONA EV tailgate story

Interesting. We don't have to slam ours. Might be able to be adjusted?
by 4Springs
Thu, 30 Jan 2020, 15:11
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 247
Views: 43884

Re: 4Springs' Brumby

Ok, so I've done an experiment. It looks like I should put something between my Nichrome and my cells. The two options are plastic or aluminium sheet. Plastic is thinner, cheaper, an electrical insulator, easier to cut and less likely to damage the cells. But it is a relatively poor conductor of hea...
by 4Springs
Thu, 30 Jan 2020, 14:38
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 247
Views: 43884

Re: 4Springs' Brumby

Could you use a heater element from a bag sealer? They are a thin strip about the thickness of the tape. I would expect the thickness to be thin enough that you will not mark the cells. They are pretty thin, I hadn't thought of them. Even though I got the idea of the PTFE sheet from my experience w...
by 4Springs
Thu, 30 Jan 2020, 13:12
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 247
Views: 43884

Re: 4Springs' Brumby

I'd be reluctant to intentionally deform the surface of the cells. Is there not a flat tape version of the same stuff? Haven't found any, but that doesn't mean much. I've dismantled a module that has been assembled compressed for 5 days. IMG_0384.JPG IMG_0381.JPG I can feel the lines with my finger...
by 4Springs
Thu, 30 Jan 2020, 08:06
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 247
Views: 43884

Re: 4Springs' Brumby

I have been planning (and doing) something that I really should run past the educated folk here. I've made up heaters for my cells consisting of resistance wire. So like Nichrome, but a different metal. The idea is that I run wire up and back in a pattern, then sandwich this between cells. I'll hook...
by 4Springs
Mon, 27 Jan 2020, 18:33
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Alternatively, the master can tell the CMUs what the average cell voltage is, and they can all bypass at that voltage, provided that voltage is above the rested 98% SoC value. Ah, now that is interesting. And something that I could implement... In my case the master tells each CMU when and how much...
by 4Springs
Mon, 27 Jan 2020, 18:24
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

The resistor type balancers work when the cell reaches X voltage and burns what ever value the resistors used can handle. That method relies on the charge current being reduced to less than the resistor burn off rate plus the load at the time ...... that would require accurate cell voltage monitori...
by 4Springs
Sun, 26 Jan 2020, 18:43
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

I presume daisy chain buss was selected to keep the wire length down, reducing noise pickup? You are still using 9600 baud? I copied the original design, so I didn't really choose. But daisy chain suits my vehicle, which has three separate battery boxes. If I used a spaghetti BMS then I'd most like...
by 4Springs
Sun, 26 Jan 2020, 03:55
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

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: 247
Views: 43884

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: 247
Views: 43884

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: 247
Views: 43884

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: 247
Views: 43884

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: 30
Views: 1869

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: 30
Views: 1869

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: 247
Views: 43884

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: 247
Views: 43884

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: 2398

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: 578

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: 718

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: 9997

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: 662

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: 9997

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...