Search found 3249 matches

by jonescg
Oct 13 2018 4:50am
Forum: Large EV General Discussion
Topic: RIPPY KART
Replies: 17
Views: 963

Re: RIPPY KART

Nice one Danny!

How do you find the 'diff' now? Must turn a lot nicer compared to a fixed axle kart?
by jonescg
Oct 12 2018 6:31am
Forum: E-Scooter and Motorcycle General Discussion
Topic: jonescg's E-max 110s lithium conversion
Replies: 46
Views: 8118

Re: jonescg's E-max 110s lithium conversion

In my honest opinion, find 60 Ah of the most garden variety LiFePO4 and use that. Any more than 3 kWh is a waste - the scooter is not much fun to ride long distances anyway. I spent about $1600 on a new battery for my scooter, so that's good value. I can't begin to thing of how sore my bum would be ...
by jonescg
Oct 12 2018 1:58am
Forum: Resources & EV Related Parts and Services
Topic: Battery Packs - Where to buy them
Replies: 149
Views: 49825

Re: Battery Packs - Where to buy them

EIG weren't known for being cheap. What is the application? E-moto? E-Scooter? E-car? A 100 Ah LiFePO4 cell will be okay with 100 A for several minutes, but they sag pretty bad under heavy load. If 350 A is your target peak current they will be OK, but 200 Ah would be safer. The pouch cells I use ar...
by jonescg
Oct 11 2018 7:25pm
Forum: Resources & EV Related Parts and Services
Topic: Battery Packs - Where to buy them
Replies: 149
Views: 49825

Re: Battery Packs - Where to buy them

Rods pricing is pretty similar to EV Works, maybe a little more expensive (by like 5% or so). He's pretty good on follow up too. I can certainly build a battery that will do what you want but it will be about three times your budget - cells aren't cheap for little guys. I will be bringing some large...
by jonescg
Oct 10 2018 11:03pm
Forum: Resources & EV Related Parts and Services
Topic: Battery Packs - Where to buy them
Replies: 149
Views: 49825

Re: Battery Packs - Where to buy them

Ribfeast wrote:
Oct 07 2018 11:47pm
Ditto, for larger packs, eg 200Ah 48V. In Australia or that will ship to Australia affordably :)
How much do you want to spend? If you're happy with LiFePO4 I'd suggest EV-Power in WA, otherwise I can build you a battery with more amps than most motors can handle.
by jonescg
Oct 09 2018 8:16pm
Forum: Battery Technology
Topic: batteries with screw terminals?
Replies: 27
Views: 820

Re: batteries with screw terminals?

I build LiPo packs with screw terminations, but here's the catch: Building repairability into the pack means not gluing the cells in place inside the enclosure. This makes them less robust and more susceptible to fretting and physical damage... creating a reason to repair it :) If you built modules ...
by jonescg
Oct 06 2018 6:31am
Forum: E-Vehicles General Discussion
Topic: Tesla 21700 cells - same but different?
Replies: 7
Views: 600

Re: Tesla 21700 cells - same but different?

The larger capacity means lower part count - it's just logical. But the cylinders are still cheaper and easier to mass produce than pouches or prismatics. Currently anyway. I'm just wondering why we're seeing claims of over 300 Wh/kg. In fact I'm yet to see more than 260 Wh/kg in real life from any ...
by jonescg
Oct 05 2018 2:17am
Forum: E-Vehicles General Discussion
Topic: Tesla 21700 cells - same but different?
Replies: 7
Views: 600

Tesla 21700 cells - same but different?

I've been trying to find a blog or something on the interwebs about the energy density of the Panasonic 21700 cells used in the Model 3. We know that the volume of the cell has gone up by ~50%, so there's more mass as well, and therefore, more active material. The proportion of non-active material t...
by jonescg
Oct 04 2018 3:21am
Forum: Battery Technology
Topic: PSA: dont underspec your strips
Replies: 26
Views: 1383

Re: PSA: dont underspec your strips

Matador wrote:
Oct 03 2018 5:54pm
So I think the idea that the solder could melt under high discharge rate is not a real life problem. It's irrelevant.
Yep - I used soldered busbars on Voltron and we were pushing 28 C peaks, or 280 amps from the 2p pack. Nothing melts, but the cells get warm.
by jonescg
Oct 02 2018 3:36am
Forum: Vendor Relations Corner
Topic: Ovartech
Replies: 7
Views: 730

Re: Ovartech

Great to see you got some useful data from it Ian!
Is it like the TC converters which use a digital input to switch them on? Or are they fed by a PTC circuit so they always give a soft start?
by jonescg
Oct 02 2018 2:06am
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 33
Views: 4028

Re: My DIY battery storage system

11.5 m by 7.5 m and 4.2 m high at the peak 8) I might even put a mezzanine on the eastern end for storing crap, and it creates a sort of clean space for electronics and battery fabrication. The PIP inverter is just for short term inverting - I plan on installing a Goodwe 5048D-ES and connecting the ...
by jonescg
Oct 01 2018 9:07am
Forum: Battery Technology
Topic: PSA: dont underspec your strips
Replies: 26
Views: 1383

Re: PSA: dont underspec your strips

Most folks will know that I'm a fan of the pouch cell and the convenience that the tabs offer for interconnects. But 18650 cells are popular and they have good energy density, so if you're going to build a pack with them, you might as well do the best you can. As the OP has noted - the overall resis...
by jonescg
Oct 01 2018 7:54am
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 33
Views: 4028

Re: My DIY battery storage system

I have moved house! Better than that, I've bought a house! Really nice place in the Perth hills with a beautiful big workshop. I've already put the rails up for solar on the shed roof. ShedPVsml.jpg The shed has the best aspect to the north, albeit with a bit of shade in the morning. The house is an...
by jonescg
Oct 01 2018 7:45am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 620
Views: 37741

Re: Tesla Model 3

I'm still at a loss as to how some folks can be so down on Tesla. Tesla are making arguably the most successful, desirable EV, and it's outselling all premium brands in it's class. They are ramping up production to somewhere between 3000 and 5000 per week. The company is about to hit pay dirt some t...
by jonescg
Oct 01 2018 12:50am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88850

Re: Assembled Hi-Power LiPo battery packs - any interest?

I've been working on a 96s2p battery pack for some uni students. The battery will eventually be used for dyno testing their powertrain but it's just as likely to end up in the car. 3.5 kWh, 355 volts and 10 Ah. It has a vestibule with contactors, fuses and precharge hardware. Three of the four modul...
by jonescg
Sep 21 2018 3:16am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Are two batteries better than one?
Replies: 12
Views: 414

Re: Are two batteries better than one?

You can charge a single battery with two chargers just as easily.
by jonescg
Sep 21 2018 2:47am
Forum: Battery Technology
Topic: Issue about battery voltage & discharge port
Replies: 13
Views: 341

Re: Issue about battery voltage & discharge port

Quite likely there is a fuse in there which has popped.
by jonescg
Sep 20 2018 5:12am
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 144
Views: 6555

Re: Supercapacitors vs batteries. Capacity.

But, but, I thought supercaps didn't explode or burn...?
http://forums.aeva.asn.au/viewtopic.php?p=69713#p69713

:shock: :shock: :shock: :shock:
by jonescg
Sep 18 2018 7:13pm
Forum: Large EV General Discussion
Topic: jonescg's eCRX pre-build thread!
Replies: 81
Views: 13961

Re: jonescg's eCRX pre-build thread!

Arlo1 wrote:
Sep 18 2018 10:54am
jonescg wrote:
Sep 17 2018 7:00am
But it would also be good to save about $8000 in inverter spend.
You should be able to do one of my kits for about 1/2 of this or less.
I'm sure I can get it cheaper - but not as cheap as a home-brew.
by jonescg
Sep 18 2018 8:47am
Forum: Battery Technology
Topic: How does ambient Temperature affect LiFePO4?
Replies: 7
Views: 290

Re: How does ambient Temperature affect LiFePO4?

Warmer = higher operating voltage = more power.

I see about 60 km range on my scooter in winter (10-20'C) versus a comfortable 65 km in summer (20-38'C)
by jonescg
Sep 17 2018 7:00am
Forum: Large EV General Discussion
Topic: jonescg's eCRX pre-build thread!
Replies: 81
Views: 13961

Re: jonescg's eCRX pre-build thread!

Yeah it might seem like staling, but the reality is I would take just as long, if not longer if I wasn't set up for the job but started anyway. Batteries are sorted - just have to find a way to make them fit. I can go for range or power. Not sure which is better, but in all reality range will be the...
by jonescg
Sep 17 2018 3:27am
Forum: Large EV General Discussion
Topic: jonescg's eCRX pre-build thread!
Replies: 81
Views: 13961

It's been 5 years since the last post!

And I'm FINALLY in a position to start planning the conversion... I was about to start a thread asking about Nissan Leaf motors, but then I remembered I have an unfinished build thread here :oops: . So what's happened since the last post? Well I moved house three times, even moved to a different cit...
by jonescg
Sep 04 2018 12:33am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88850

Re: Assembled Hi-Power LiPo battery packs - any interest?

Looks like there is some interest in more of these high power LiPo cells. So it's time for another order! MOQ is 550 cells, but I can get a 5% discount if I order 1000. That makes the landed price $15.45 + GST Australian orders only, sorry. I am happy to build a battery and ship it to anyone in the ...
by jonescg
Sep 03 2018 6:57am
Forum: E-Scooter and Motorcycle General Discussion
Topic: IXXAT AND DVT
Replies: 5
Views: 277

Re: IXXAT AND DVT

I ship internationally and have these kits in stock (IXXAT and DVT together). Let us know. I got these for people like you in the forums, so you didn't have to buy expensive ones from other places. Travis, Will these kits talk to the Zero motorcycle? Quite a few folks have orphaned Zeros here in Au...
by jonescg
Sep 02 2018 7:35am
Forum: Battery Technology
Topic: LiFePO4 in 18650 format?
Replies: 37
Views: 1138

Re: LiFePO4 in 18650 format?

I'll have a look. My work has asked me to source some cells for an underground mining application. They have explicitly asked for LFP chemistry for safety reasons. Why 18650 format? Well that's the hill we've decided to die on apparently so that format will have to do. I still think NMC or LCO are f...