Search found 368 matches

by joromy
Tue Sep 20, 2022 6:25 pm
Forum: General
Topic: EV conversion with everything made from wood
Replies: 3
Views: 185

Re: EV conversion with everything made from wood

Didn't see all of this video, but I was immediately thinking that this was a mockup.
Maybe he is going to the "Burning man (car) festival" :D
by joromy
Wed Jul 06, 2022 7:23 pm
Forum: General
Topic: Drive mode selector using Arduino
Replies: 2
Views: 396

Re: Drive mode selector using Arduino

Thank you for sharing, have been looking for something like this. I alredy have a Teensy as my main ECU/display.
Simple is good ;)
by joromy
Wed Jul 06, 2022 6:02 pm
Forum: Getting Started
Topic: Tesla SDU capacitor size / precharge
Replies: 10
Views: 1264

Re: Tesla SDU capacitor size / precharge

alexbeatle wrote: Tue Jun 28, 2022 7:15 am
So in the 75kWh pack =>
14modules * 25.2Vmax per module = 352.8Vmax per pack
Imax = 352.8V / 23ohm = 15.34A
So the the pre-charge contactor would just need to handle 15.3A peak. Correct?
Yes, looks sane to me. If the capasitors is seen as full short?
by joromy
Wed Jul 06, 2022 5:36 pm
Forum: Tesla
Topic: Tesla Charger alternative firmware
Replies: 287
Views: 27742

Re: Tesla Charger alternative firmware

There's a few different ways to do it! The simplest, I think, is to route L1 to all 3 modules by default (for single phase operation) - that can be done with a single DPDT relay. Then the charger works in single phase mode as normal, so CP current limit divided by 3 to each module. This relay can b...
by joromy
Tue Jul 05, 2022 1:29 pm
Forum: Battery Managment (BMS)
Topic: New BMS for bq76PL455A based batteries
Replies: 144
Views: 7762

Re: New BMS for bq76PL455A based batteries

I hav struggled with the same noise problems, with isolating comm just with capasitors. It is not a good solution in noisy enviroment! It's to high impedanse, and that is bad in noisy enviroment. You want low impedance opto coupler, or a digital isolator. This is used on the tesla battery boardit is...
by joromy
Thu Jun 30, 2022 7:10 am
Forum: General
Topic: Kilovac contactor has a high resistance
Replies: 14
Views: 541

Re: Kilovac contactor has a high resistance

I would not trust it, trow it away! A contactor should always show 0 ohm, if it's closing properly, with right voltage and working economizer. You say you could use the economizer on the other contactor, then you could try to bypass the economizer and connect 12V directly on the Kilovac coil? Just f...
by joromy
Tue Jun 14, 2022 7:05 am
Forum: General
Topic: Precharge and Contactor Control [SOLVED]
Replies: 26
Views: 1302

Re: Precharge and Contactor Control [SOLVED]

E46Driver wrote: Mon Jun 13, 2022 2:17 pm But doesn't STM have internal pulldown 30K already?
Yes, don't know if that is enabled, but this is a mystery?
by joromy
Mon Jun 13, 2022 7:37 am
Forum: General
Topic: Precharge and Contactor Control [SOLVED]
Replies: 26
Views: 1302

Re: Precharge and Contactor Control [SOLVED]

E46Driver wrote: Mon Jun 13, 2022 3:11 am Hey joromy, thats interesting. I tried both a 10K pulldown and pullup - but neither worked for me. However, I did that AFTER the ULN chip.
You must put pulldown on the STM chip!!
And it's not pin13 is pin2.
by joromy
Fri Jun 10, 2022 1:18 pm
Forum: General
Topic: Precharge and Contactor Control [SOLVED]
Replies: 26
Views: 1302

Re: Precharge and Contactor Control [SOLVED]

Can someone scope the chain? STM32 pin, uln pin, I'm out of lab for a while I got the same problem with high impedance load. Could be "crosstalk" but not sure? A 10k pulldown worked for me. Also very important to have 12V all time on COM of the ULN chip!!! Measurements: OUT_DCSW PC13 comi...
by joromy
Fri Jun 10, 2022 1:05 pm
Forum: Inverter Firmware
Topic: Inverter Firmware v5.14.R
Replies: 23
Views: 4023

Re: Inverter Firmware v5.14.R

I got the same problem with high impedance load.
I don't think this can be version related.

Moved to more appropriate place: https://openinverter.org/forum/viewtopi ... 309#p41309
by joromy
Wed Mar 09, 2022 12:29 pm
Forum: Classifieds
Topic: Ford ranger ev inverters
Replies: 2
Views: 585

Re: Ford ranger ev inverters

Long shoot, do you still have them?
by joromy
Thu Jan 13, 2022 3:59 pm
Forum: Projects
Topic: Locost 7 Upgrade
Replies: 7
Views: 1195

Re: Locost 7 Upgrade

Wow, great project.
I guess you are swapping motor and inverter with openinverter and leaf motor
by joromy
Sat Dec 18, 2021 1:31 pm
Forum: Projects
Topic: Nova Autotest Car
Replies: 14
Views: 1735

Re: Nova Autotest Car

Is this a feature that could be useful for you?

Bi-directional throttle.
viewtopic.php?f=7&t=2076
by joromy
Thu Dec 16, 2021 10:15 pm
Forum: Battery Managment (BMS)
Topic: ST BMS for 14 cells
Replies: 3
Views: 957

Re: ST BMS for 14 cells

by joromy
Thu Dec 16, 2021 1:53 pm
Forum: Battery Managment (BMS)
Topic: ST BMS for 14 cells
Replies: 3
Views: 957

ST BMS for 14 cells

Got this evaluation board in the mail today.
BMS for 14 cells, can add slave boards with 14 cells.
Comes with preloaded firmware.
Christmas is saved :D

https://www.st.com/en/evaluation-tools/ ... l#overview
image.PF271263.jpg
by joromy
Fri Dec 10, 2021 8:53 am
Forum: Battery Managment (BMS)
Topic: Voltage threshold for balancing
Replies: 7
Views: 1510

Re: Voltage threshold for balancing

I think balancing before 3.95V is a waste of energy. I also think cells should never be discharged lower than 3.0V per cell. But what if I always charge to 80%, when should I then balance? (I usually charge to 4.00V, and they rest at about 3.95V) So what you actually mean is I should charge to high...
by joromy
Thu Dec 09, 2021 10:13 pm
Forum: Tesla
Topic: Tesla Charger Support Thread
Replies: 781
Views: 76391

Re: Tesla Charger Support Thread

I think the quote from "Jack Bauer" is for the AC side
by joromy
Thu Dec 09, 2021 10:01 pm
Forum: Battery Managment (BMS)
Topic: Voltage threshold for balancing
Replies: 7
Views: 1510

Re: Voltage threshold for balancing

I start top balancing 3.8V, but it depends on the quality of cells, the size of bleed resistors.. You should also consider if you want to charge them to 100% all the time, if you charge to 80-90%, you may have to start balancing at lower voltage. If your batteries need much balancing, then they need...
by joromy
Tue Nov 30, 2021 10:18 pm
Forum: General
Topic: AC batteries
Replies: 1
Views: 611

AC batteries

Found this article about AC batteries, have seen something similar before. But this is new. Is this the end for HV inverter and charger? https://www.tu.no/artikler/vil-revolusjonere-batteriteknologien/515416?key=rbasNgz1&fbclid=IwAR2fn9rp2OQoozguHN4wM4gZRatIz7QCVcSOwLW3sXsGtUJlf-fu-Wvvg4M It's i...
by joromy
Mon Nov 29, 2021 5:13 pm
Forum: Tesla
Topic: Tesla Charger Support Thread
Replies: 781
Views: 76391

Re: Tesla Charger Support Thread

janosch wrote: Mon Nov 29, 2021 4:45 pm Wow this is great! Do you have a link to the video? Who is the guy in the picture?
Not sure i snipped it a while ago. But if I'm not wrong it was "Rich Rebuilds" on YouTube
by joromy
Mon Nov 29, 2021 4:37 pm
Forum: Tesla
Topic: Tesla Charger Support Thread
Replies: 781
Views: 76391

Re: Tesla Charger Support Thread

janosch wrote: Mon Nov 29, 2021 1:54 pm We considered drilling and tapping an extra bleed screw into our Gen2 charger because of our positioning (sideways & upright & high in the cooling circuit).
Not so easy to see the waterflow.
I found this
coldplate.JPG
coldplate2.JPG
coldplate2.JPG (18.24 KiB) Viewed 3051 times
by joromy
Sun Oct 17, 2021 8:51 am
Forum: Ford
Topic: Ford ranger Electric from lead to NiMH
Replies: 3
Views: 915

Re: Ford ranger Electric from lead to NiMH

Is that the original Ford/Toyota (Panasonic) NiMh batteries?
If not you will have trouble with the dimensions, pole fitting and placement.
by joromy
Sun Oct 17, 2021 8:44 am
Forum: Ford
Topic: Ford Ranger electric maximum speed
Replies: 1
Views: 666

Re: Ford Ranger electric maximum speed

No
by joromy
Sat Oct 16, 2021 10:35 pm
Forum: Ford
Topic: Ford ranger Electric from lead to NiMH
Replies: 3
Views: 915

Re: Ford ranger Electric from lead to NiMH

I have:
Complete high and low voltage harness.
IOM
BCM
Fans

But why not change to Lipo, do you have NiMh batteries?
by joromy
Thu Sep 02, 2021 8:05 pm
Forum: General
Topic: Regen blows charger fuses ??
Replies: 9
Views: 1248

Re: Regen blows charger fuses ??

Just put a diode on the charger output. Maybe that is built in on your other charger. Yes I have thought about that but then the charger probably wont see that a battery is connected when starting to charge. Maybe connecting a diode with a 10K resistor in parallel so it can sense that battery volta...