Search found 474 matches

by 4Springs
Yesterday, 19:08
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 9
Views: 656

Re: Low Cost BMS for Home Storage Batteries

I've done some work on the BMS module board to fit the Brighsun cells. Here is the version I made for my car: CellTopBMS-SE130AHA_1.jpg I had some notes on this version: 1. The board was a bit wide at the terminals. Some boards had to be trimmed a bit narrower to sit on top of a certain type of batt...
by 4Springs
Sat, 18 Aug 2018, 05:54
Forum: Nissan Leaf
Topic: Non OEM Leaf battery upgrade?
Replies: 14
Views: 200

Re: Non OEM Leaf battery upgrade?

Nice - any idea on price? With a bit of research, maybe a clever simple cooling system could be added too. Or in my climate - a battery heater! I assume that battery warming pads wouldn't be too hard to fit in. These are the ones I use in my home-build: https://wolverineheater.com/products/model-bh-...
by 4Springs
Sun, 12 Aug 2018, 16:28
Forum: Technical and conversion discussion
Topic: Reverse-cycle (heat pump) heating
Replies: 18
Views: 2041

Re: Reverse-cycle (heat pump) heating

Cold again, so I've been working on this heatpump, trying to get it more efficient. I've decided to put a heatsink on the evaporator coils around the motor. I had various ideas, but eventually settled on something fairly cheap and simple. Took quite a lot of work to make though. I bought some alumin...
by 4Springs
Sun, 12 Aug 2018, 15:01
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 9
Views: 656

Re: Low Cost BMS for Home Storage Batteries

Hi Chris, I haven't looked on here for years, been busy with other stuff, but i am wondering if this project ever got off the ground? Nice to know my old BMS stuff still has relevance! Neville Hi Neville, good to hear from you! Every couple of months I'm at a car show somewhere, showing someone the...
by 4Springs
Tue, 31 Jul 2018, 15:07
Forum: Nissan Leaf
Topic: Nissan Leaf Battery Flattening Test
Replies: 3
Views: 196

Nissan Leaf Battery Flattening Test

Has anyone had their Nissan dealer recommend that they flatten their battery on a routine basis? A member has had this advice, that he should run the car almost flat, then turn on the heater flat-out until the car completely dies. Then charge it up again, and repeat a couple of times over the follow...
by 4Springs
Sun, 29 Jul 2018, 06:58
Forum: Blade EVs
Topic: LONG DISTANCES IN A BLADE
Replies: 11
Views: 732

Re: LONG DISTANCES IN A BLADE

Newbie Question: Is it possible to range extend a Blade by carrying a little generator in the boot? Find out what current the Blade charger draws. Then check just how "little" a generator is that will supply that current continuously. Generators are often sold on the peak power output, but you shou...
by 4Springs
Fri, 20 Jul 2018, 15:22
Forum: Renewable Energy and Storage (Non-EV)
Topic: Brighsun 220Ah cells
Replies: 20
Views: 927

Re: Brighsun 220Ah cells

When I made the comment about making a "u-shaped" version, I naively thought that it would just be a bit of tweaking in the design software, post to the manufacturer and get a few spat out. I'd forgotten about the setup costs. That said, what kind of overhead is involved? With this batch of specifi...
by 4Springs
Sun, 15 Jul 2018, 06:13
Forum: Hyundai
Topic: Hyundai Australia Kona EV info
Replies: 32
Views: 2013

Re: Hyundai Australia Kona EV info

reecho wrote:
Sat, 14 Jul 2018, 14:57
And this car will put the biggest dent in all the Model 3 pre-orders that Tesla have in Australia.
If it gets here before the Model 3. Based on past experience I'm not holding my breath!
by 4Springs
Thu, 12 Jul 2018, 16:40
Forum: Hyundai
Topic: Hyundai Australia Kona EV info
Replies: 32
Views: 2013

Re: Hyundai Australia Kona EV info

Hey - according to that article it has wireless inductive charging!! :o
by 4Springs
Thu, 12 Jul 2018, 16:36
Forum: Hyundai
Topic: Hyundai Australia Kona EV info
Replies: 32
Views: 2013

Re: Hyundai Australia Kona EV info

I Repeat it's a hatchback. Yeah, you don't have to repeat it. I will though - it's a hatchback. A very nice looking hatchback that might just fit our needs. As long as it can tow (like the ICE Konas) and as long as the seats fold down to make a flat cargo space (unlike the ICE Konas). We'd be repla...
by 4Springs
Sun, 01 Jul 2018, 06:31
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 9
Views: 656

Re: Low Cost BMS for Home Storage Batteries

I think the best thing to do is put them all in parallel and leaver them like that for a week while the all reach the same state of charge. Should make the balancing job a bit easier. I did this with the LFP cells for my car. 45 of them. The way I did it was to loosely put bolts in the terminals, l...
by 4Springs
Tue, 26 Jun 2018, 17:57
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 9
Views: 656

Re: Low Cost BMS for Home Storage Batteries

Hi Christopher, This looks like a great project. I'd like to help, but the soldering puts me off, I've never been much good at it. I followed your link to the BMS you made for your car and read in the Wiki that another option could be to get the whole board manufactured. Would this add much to the ...
by 4Springs
Sun, 24 Jun 2018, 06:17
Forum: General EV Discussion
Topic: Offer for all members Friday 9am WST
Replies: 13
Views: 845

Re: Offer for all members Friday 9am WST

I'm not sure that the specifications are correct for the 220Ah version - they are exactly the same as the 460Ah version except for the weight. Even lists the capacity as 460Ah! No, hang on, I'm wrong. The dimensions are not the same, the 460Ah one is taller - as per the photos above and as per the ...
by 4Springs
Sun, 24 Jun 2018, 06:02
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 9
Views: 656

Low Cost BMS for Home Storage Batteries

Looks like I will be getting some of the ex-AVASS cells (as per the the forum topic here: http://forums.aeva.asn.au/viewtopic.php?f=16&t=5574 ). The "Low Cost BMS" is a project I used in my car, and should be ideal for these - low cost but just fancy enough to do all that is required. As is the tend...
by 4Springs
Sat, 23 Jun 2018, 06:26
Forum: General EV Discussion
Topic: Offer for all members Friday 9am WST
Replies: 13
Views: 845

Re: Offer for all members Friday 9am WST

I'm not sure that the specifications are correct for the 220Ah version - they are exactly the same as the 460Ah version except for the weight. Even lists the capacity as 460Ah!
by 4Springs
Sat, 23 Jun 2018, 06:23
Forum: General EV Discussion
Topic: Offer for all members Friday 9am WST
Replies: 13
Views: 845

Re: Offer for all members Friday 9am WST

They are very light for LFP. I can see why they were going to use them in buses. I could make a 10kWh 'generator'. Plug it into the 240V to charge up, then it provides 240V output. Use it as a range extender for the Brumby (charger on while driving), and as an AC coupled home storage battery. The ba...
by 4Springs
Fri, 08 Jun 2018, 18:45
Forum: Parts & Suppliers
Topic: Heat Conductive Materials
Replies: 7
Views: 809

Re: Heat Conductive Materials

if yuo can be sure it won't leak out the bottom or the sides, loosen it off, fill 'er up, and tighten the clamp again. No, definitely can't seal the bottom or sides. Even if I could, I doubt that it would fill the spaces well, there would be air bubbles everywhere. I'm going to have to take the she...
by 4Springs
Fri, 01 Jun 2018, 15:34
Forum: Parts & Suppliers
Topic: Heat Conductive Materials
Replies: 7
Views: 809

Re: Heat Conductive Materials

There is also goop in a tube which might be more practical to apply. AS1803-310ML Farnzy has some about $40/tube 8497400. For those following along at home, the last line of Richo's post means that the online-retailer called Element 14 sells this product. He's nicknamed it Farnzy, presumably becaus...
by 4Springs
Wed, 30 May 2018, 16:12
Forum: Parts & Suppliers
Topic: Heat Conductive Materials
Replies: 7
Views: 809

Heat Conductive Materials

Does anyone know of a heat-conductive material suitable for ensuring heat transfer between my motor and cooling coils? The motor is 270mm in diameter, and is surrounded by copper tubing which coils around it. The motor is not smooth, and the coils are not even, so there is probably little actual con...
by 4Springs
Thu, 17 May 2018, 18:05
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 57
Views: 3081

Re: Prelude conversion project - some questions

Details on that heat exchanger? It looks a neat little unit.
by 4Springs
Sun, 13 May 2018, 06:03
Forum: Batteries, charging, management and monitoring
Topic: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale
Replies: 341
Views: 18885

Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Oh dear... https://www.gumtree.com.au/s-ad/brisbane-city/building-materials/off-grid-5kw-syst-with-safe-supercapacitor-batteries-62p-w/1178196224 Very professional-looking organisation there. I'd be interested in their Lithium Iron batteries but there doesn't seem to be any info! http://polygreenso...
by 4Springs
Mon, 16 Apr 2018, 16:05
Forum: Charging Infrastructure
Topic: The Energy Retailers Strike Back. Will Cheap Off Peak Rates Kill Battery Storage?
Replies: 14
Views: 676

Re: The Energy Retailers Strike Back. Will Cheap Off Peak Rates Kill Battery Storage?

It won't be long until off peak is basically 10pm until 3pm. The battery only needs to be big enough to last until off peak starts for best economics. Our electricity product has two off-peak times, one is 10:00-16:00, the other is 21:00-7:00. Peak price is 30c, off-peak 14c, feed-in is 10c. I wond...
by 4Springs
Sat, 31 Mar 2018, 08:23
Forum: Batteries, charging, management and monitoring
Topic: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale
Replies: 341
Views: 18885

Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

https://youtu.be/m_hyyQ5-d0E Super capacitor charge test Nobody has commented on the contents of this video yet! I'm waiting with bated breath! I've charged a lithium battery or two in my time, but never a supercapacitor. The results look like what I'd expect with a battery - what would the differe...
by 4Springs
Fri, 30 Mar 2018, 11:06
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 57
Views: 3081

Re: Prelude conversion project - some questions

I'm wondering if a thermostat can be set up so that if you're parked in the sun all day, the AC can come on if needed. Seems quite energy intensive though. Doesn't sound too hard, you'll need a thermostat anyway in normal running. If you need it to run when nobody is in the car it would be much mor...
by 4Springs
Fri, 30 Mar 2018, 04:41
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 57
Views: 3081

Re: Prelude conversion project - some questions

I figure a heat exchanger just before the blower is a good place to chill the battery coolant. Being tied directly to the air conditioning, whenever the driver is hot enough to need AC, the battery will get some of it too. I'm no expert, but my thought is that having the heat exchanger after the bl...