Search found 56 matches

by themelon
Apr 21 2018 8:32am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 1144
Views: 107988

Re: Tesla Model 3

. . . .when most people say the word Tesla they think about a highly desirable fancy Electric car so Tesla got the branding nailed down for sure. Tesla should listen to you on that. But both the Model S and the Model 3 are efforts away from that into the relatively cheap, eventually. The branding t...
by themelon
Apr 19 2018 3:48pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 1144
Views: 107988

Re: Tesla Model 3

. . . .when most people say the word Tesla they think about a highly desirable fancy Electric car so Tesla got the branding nailed down for sure. Tesla should listen to you on that. But both the Model S and the Model 3 are efforts away from that into the relatively cheap, eventually. The branding t...
by themelon
Apr 18 2018 4:43pm
Forum: Battery Technology
Topic: Straight Answer on Using Lithium Power Tool Batteries
Replies: 6
Views: 1257

Re: Straight Answer on Using Lithium Power Tool Batteries

Most of the time at least one of the extra contacts is a temperature signal from the internal BMS in the battery. Normally this is only used by the charger to let the battery cool off before charging.
by themelon
Apr 18 2018 9:03am
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 179
Views: 28771

Re: Buick Lacrosse 2012 e-assist moto-alternator

many ATVs are 40 HP or below, for instance LT-Z 400 was 36 HP, Kymco 500 (AWD) was 36, only the 600+ cc engines normally had 50 HP or more. For me in an ATV the goal is to have at least the same thrust than weight (without driver) even if it makes the final speed to be a little low. For instance th...
by themelon
Apr 17 2018 11:45am
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 179
Views: 28771

Re: Buick Lacrosse 2012 e-assist moto-alternator

superb pictures! 400A (IGBT) seems good for this motor, although in the Delta setup it can manage more (but with less efficiency) BTW: I uploaded some videos of e-vehicle testing on a rolling road dyno e-kart: https://youtu.be/VThKHwb1Tv4 e-ATV https://www.youtube.com/watch?v=ksymUROLMeo Thanks! I ...
by themelon
Apr 15 2018 3:51pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 179
Views: 28771

Re: Buick Lacrosse 2012 e-assist moto-alternator

Has anyone made or seen any effort to use the OEM inverter, or at least some of it's components, for the eAssist Gen1 motor? It is in a somewhat unusual package in that the DC to DC converter and inverter are in the same case and the common controller board for the two is ~60% of it with the other b...
by themelon
Apr 11 2018 9:58pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

These are decent BMS. I would not be afraid to buy more of them. http://i1055.photobucket.com/albums/s515/rkenders/EV%20Stuff/BMS/24S%20smart%20BMS%20-%20LCD/BMS%20LCD%20screens%201.jpg Working good enough that I ordered more. Thinking of listing them on eBay. Have to mark them up but won't have to...
by themelon
Apr 11 2018 3:07pm
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

Educated...LOL...no not really. I did go to school for an EE in the late 80's, but otherwise any "education" I have is becasue I read about subjects that I want to know about. Anyone can do what I have done...if they stick to it. I remember not so long ago having no idea how mosfets work ...
by themelon
Apr 11 2018 12:43pm
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

What I was worried about was continuous charging from the alternator. The voltage issue isn't really an issue as my truck is pretty much dead on 14.4-14.5 all the time so 6s should cover it nicely with margin. There is probably something else in the circuit that makes it not an issue that I'm not t...
by themelon
Apr 11 2018 12:17pm
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

Not I. :D They were installed in an engine compartment for a two month test. Wasn't driven over an hour. After return from a short vacation they were dead and swollen. Must have been enough draw to kill 22ah. After that, I don't know the story. Whether swollen during charge or what. Doubt if it was...
by themelon
Apr 11 2018 11:42am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

I'm pretty sure this BMS is vaporware. INWO checked into getting something like it and they didn't exist. https://www.aliexpress.com/store/product/Cascading-High-Power-Smart-Protection-Board-Li-ion-Titanate-LiFePO4-Lithium-Battery-22S-24S-Cell-BMS/2856009_32856365318.html When I try to buy this one...
by themelon
Apr 11 2018 11:31am
Forum: Large EV General Discussion
Topic: Go Kart Update
Replies: 77
Views: 14296

Re: Go Kart Motor to compete against DD2 Petrol Motor

It's to bad something like the smaller one. It is the motor out of a first gen GM eAssist mild hybrid platform. It is likely under-powered at 15kW: https://endless-sphere.com/forums/download/file.php?mode=view&id=232134 This one would be awesome but it is way to heavy. Chevy Spark EV trans-axle,...
by themelon
Apr 11 2018 10:31am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

Not I. :D They were installed in an engine compartment for a two month test. Wasn't driven over an hour. After return from a short vacation they were dead and swollen. Must have been enough draw to kill 22ah. After that, I don't know the story. Whether swollen during charge or what. Doubt if it was...
by themelon
Apr 10 2018 2:42pm
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

I like it!...as long as the battery tabs are aluminum-to-aluminum, the metal on the outside that is clamping them together is free to be steel, brass, etc... Some ideas and links littered throughout this PriusChat thread: https://priuschat.com/threads/connecting-a123-20ah-lithium-prismatic-cells.11...
by themelon
Apr 10 2018 11:47am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

Hey Circuit... I have an idea for you. Your BMS is an all in one device. How about split out the power mosfets to a separate board and then make the balancing and monitoring boards stack-able. This allows your product to reach a far broader market (people like me!!!) where 16S is flat out a show st...
by themelon
Apr 10 2018 11:16am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 32746

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery

That's my current solution...super cap boards. I just received a couple of them today not realizing that what I had ordered didn't actually have board space dedicated for mounting the caps. It has balance leads. So there is likely not much point, at least right now, in trying to get custom ones mad...
by themelon
Apr 10 2018 1:19am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

That's my current solution...super cap boards. I just received a couple of them today not realizing that what I had ordered didn't actually have board space dedicated for mounting the caps. It has balance leads. So there is likely not much point, at least right now, in trying to get custom ones mad...
by themelon
Apr 09 2018 3:28pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

i think you can get bestech to make a LFP series if you ask nicely. you can either sell them with a balance board or use them yourself but if you get 200 you can probably get your own custom ones made. Perhaps a group buy for LTO balance boards? It may not be necessary though if the SuperCap boards...
by themelon
Apr 08 2018 2:17pm
Forum: Items for Sale - New
Topic: 12v lithium battery LTO 6s* 11ah LTO cells
Replies: 17
Views: 4129

Re: 12v lithium battery LTO 6s* 11ah LTO cells

Another pack case idea. 40mm grenade ammo can....
2018-04-08 14.01.48-small.jpg
2018-04-08 14.01.59-small.jpg
2018-04-08 14.01.59-small.jpg (189.24 KiB) Viewed 3483 times
by themelon
Apr 05 2018 7:54am
Forum: Battery Technology
Topic: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc
Replies: 68
Views: 28277

Re: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc

Inwo wrote:
Apr 04 2018 6:02pm
Anyone else?
I need one more 8s for someone.
I actually have two of them but they are in my Bolt :D
by themelon
Apr 02 2018 3:41pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

in the high quality range ? define that please. For me it would mostly be about the quality of the circuit board and the accompanying software. I can always replace components like crappy FET's, resisters, and such as well as beef up high current traces and cooling since I'm only interested in them...
by themelon
Mar 28 2018 8:02am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

in theory just having a balance board with a data connection would be enough. it would not require the full bms. a fairly simple board (no mosfets or other crap) that just measures voltages and relays that to the main board would be enough and cheaper. buying 300+ euro for a dual bms option is hard...
by themelon
Mar 27 2018 10:16pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214866

Re: bluetooth BMS?

Thank you for valueable feedback. This is not a first time I hear about wire length, so I'll make sure we will be able to offer longer balancing wire kits soon (couple months?). By the way, there were several firmware updates, check release notes. Contact support for update file. It sure would be n...
by themelon
Mar 18 2018 11:58am
Forum: Battery Technology
Topic: 12s charger or supply 50.4v cc/cv
Replies: 11
Views: 1020

Re: 12s charger or supply 50.4v cc/cv

You can always use something like this: https://www.amazon.com/dp/B071LGTTRN with the higher voltage supply to step it down to exactly what you want. I just ordered one of these to try out but it only goes to 50v. Has a real nice display though: https://www.amazon.com/gp/product/B0744BT79M On that s...
by themelon
Mar 15 2018 3:21pm
Forum: Items for Sale - Used
Topic: More LTO cells ~3.5ah
Replies: 20
Views: 3300

Re: More LTO cells ~3.5ah

I'll take a sample to try out if you are still offering. My partner is on vacation for a couple weeks. He has test charged a completely dead cell @25a rate. Full capacity. I have come up with a number of uses for them and would likely not have a problem going through more than 500 cells pretty quic...