Search found 109 matches
- Sun May 05, 2024 8:44 pm
- Forum: General
- Topic: Mercedes Benz 48V MHEV BSG - Help needed
- Replies: 12
- Views: 6178
Re: Mercedes Benz 48V MHEV BSG - Help needed
The current comes from shorting the winding which will then rise in voltage on release. To do what you want you could pick up a Ebike controller or similar with regen and use that to charge the battery, you would have to make your own controller for the armature winding using a pwm of some kind and ...
- Sat May 04, 2024 6:06 pm
- Forum: General
- Topic: Mercedes Benz 48V MHEV BSG - Help needed
- Replies: 12
- Views: 6178
Re: Mercedes Benz 48V MHEV BSG - Help needed
That sounds exactly right, the rectified output must always be below battery voltage to avoid charging while the battery is full, otherwise when you were revving the engine the diode bridge in the mosfets would be rectifying it into dc back into the battery whether it needed charge or not. The motor...
- Fri Nov 24, 2023 3:01 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
Thats the wrong type of Prius battery, you want 2015 onwards Li-ion, Using the nickel metal hydride cells is a pita as you rightly said.
- Thu Nov 23, 2023 5:33 pm
- Forum: Tesla
- Topic: Help identify Tesla gen3 charger DC voltage divider circuit
- Replies: 1
- Views: 720
Re: Help identify Tesla gen3 charger DC voltage divider circuit
you should look up the IC's datasheets until you find something like a DC Voltage Isolation Sensor it will likely be connected to a long string of resistors, I can see several likely candidates on that board.
- Thu Nov 23, 2023 5:24 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
It makes sense now, you are building a hybrid so you want the highest C rate for both charging and discharging You will always need a BMS, you cannot skip this part no matter what anyone says, its asking for problems. There are a lot of hybrid packs out there, they are really cheap because no one kn...
- Thu Nov 23, 2023 3:44 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
as a rule of thumb as the cells get smaller the C rating gets higher and vice versa, with the slight exception of the new tesla cells which have different cell termination, this is why I think you see such low C rating for LFP chemistry because they are designed for energy storage, if you had a 280a...
- Thu Nov 23, 2023 3:13 pm
- Forum: General
- Topic: BMS questions
- Replies: 3
- Views: 1173
Re: BMS questions
Bexanders BMS should work with your pack have a look on the forum for it.
- Thu Nov 23, 2023 2:14 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
You explained it pretty well yourself, the LFP batteries that are sold with low C are designed for solar, generally LFP have high C rating compared with Li-Ion especially for charging, I may be wrong but i thought this was common knowledge? What LTO cells are you comparing the C rate with? the Toshi...
- Wed Nov 22, 2023 7:09 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
with no LFP that I can find able to deliver 8-10C, I'm left with Lithium Ion, and LTO. Sure, I am very surprised by that, LFP chemistries are well known for their high C rating, and you should be fine with the higher temps as long as your design is ok, they really struggle in low temperatures. Most...
- Wed Nov 22, 2023 2:05 pm
- Forum: Battery Managment (BMS)
- Topic: LTO battery management
- Replies: 18
- Views: 3529
Re: LTO battery management
The energy density of LTO is quite low, and I imagine the quality will vary quite a bit, would it not be just as easy to get LFP? You could probably find whole modules designed for EV conversions on there.
- Fri Nov 17, 2023 1:08 am
- Forum: Classifieds
- Topic: gone: 6x eltek charger, at least 1 working... + housing and cooling
- Replies: 7
- Views: 1286
Re: free: 6x eltek charger, at least 1 working... + housing and cooling
If these are like the eltek power chargers I have, they should be mounted to a cold plate (wc) or heat sink, do you have a model number for them?
- Thu Nov 16, 2023 4:15 pm
- Forum: News
- Topic: Electric cars catch fire in Florida after flooding
- Replies: 21
- Views: 11208
Re: Electric cars catch fire in Florida after flooding
These are just growing pains, as the chemistry and application progresses it will become safer, Look how far we have come in the last 10 years, the progress has been astounding, and they are competing with 100+ years of ICE technology. Saying all that it really is surprising that the battery packs a...
- Sun Nov 12, 2023 2:40 am
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
Im currently using a resistor divider on the 5v line to emulate a voltage, the inverter has an ACPL-C87AT DC Voltage Isolation
Sensor onboard and i can use that or a can bus value it transmits from it.
Sensor onboard and i can use that or a can bus value it transmits from it.
- Sat Nov 11, 2023 10:52 pm
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
That worked well, the thermistor value is populated in the place that it should, but with extra 0 readings that i need to remove. Im having trouble with the contactors, your code originally read the precharge pin directly but as i am now using pwmWrite thats not possible so i changed that to checkvo...
- Sat Nov 11, 2023 10:13 pm
- Forum: General
- Topic: Configuring battery to 650V - considerations
- Replies: 13
- Views: 4375
Re: Configuring battery to 650V - considerations
Forget about using the buck / boost for traction purposes, you would get more power and efficiency with a single 300v battery, you would be limited to 30kw max at around 80% eff... is there any reason you need to use the 450h at 650v rather than 325v? You should get a good amount of power even at th...
- Sat Nov 11, 2023 7:13 pm
- Forum: General
- Topic: Configuring battery to 650V - considerations
- Replies: 13
- Views: 4375
Re: Configuring battery to 650V - considerations
650v is used by the 450h so it must be rated for higher than that https://openinverter.org/wiki/Lexus_GS4 ... 20the%20GS.
- Sat Nov 11, 2023 6:17 pm
- Forum: General
- Topic: Configuring battery to 650V - considerations
- Replies: 13
- Views: 4375
Re: Configuring battery to 650V - considerations
Im talking bout creepage distance between two conductors or any bare metal case etc.. you don't want a breakdown between two conductors and you want a margin of safety. The cable does matter, I would have thought you want minimum 1000v DC rating double insulated cable, if you are recycling parts fro...
- Sat Nov 11, 2023 1:46 pm
- Forum: General
- Topic: Configuring battery to 650V - considerations
- Replies: 13
- Views: 4375
Re: Configuring battery to 650V - considerations
its possible to use a contactor to split the pack into 2 and then use 2 separate chargers, you need to make sure your isolation clearance and cable rated voltages are enough.
- Fri Nov 10, 2023 6:45 pm
- Forum: General
- Topic: Isolation Monitor - Suggestions?
- Replies: 55
- Views: 10942
Re: Isolation Monitor - Suggestions?
There is a separate isolation detection module in the imiev and outlander phev, i don't know whether they are CAN based or outputs an analogue signal. EDIT, the detection module grounds the contactor so it should be relatively easy to use. http://mmc-manuals.ru/manuals/i-miev/online/Service_Manual/2...
- Fri Nov 10, 2023 2:43 pm
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
Im trying to get the thermistor value into the existing cellblock temp in the code but i don't know where to call for it, I got it to read and serial print data in the loop so i know its working but I want to make use of the high and low cell functions to put in some hardware protections for high an...
- Tue Nov 07, 2023 10:58 pm
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
The lack of a datasheet for the contactors is problematic. Doing some testing has left me wondering whether the contactors need PWM after all, it seems the hold off setting needs to be a lot higher than i have seen with other contactors. The contactors are driven from a BTS723GW on the existing PCB,...
- Sun Nov 05, 2023 5:12 pm
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
Did you also implement PWM for economiser control of your contactors? you mind sharing your code for this? it may be easy for you, programming is not something I find easy. I have tried modifying the code to use an extra pin for the contactor and analogwrite with a delay going from value 255 then 50...
- Sun Nov 05, 2023 3:28 pm
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
tidy setup, do you have contactor control on that board? I think this will need to be changed to reflect the number of modules and whether they are series / parallel if((batteryVoltage > 300) && (compareVoltage > batteryVoltage) && (millis() - lastMillisContactor > 500)) I also found...
- Fri Nov 03, 2023 1:11 am
- Forum: Inverters / Motor Controllers
- Topic: Help me communicate with Azure Dynamics DMOC445 or I sell it
- Replies: 15
- Views: 6879
Re: Help me communicate with Azure Dynamics DMOC445 or I sell it
RS232 gives inverted signals compared with TTL You can grab a couple of transistors and resistors create a transmit and receive inverting amplifier and connect it to the USB TTL and it will probably work just fine. I had exactly the same with my lebowski controller with the gibberish you describe on...
- Fri Nov 03, 2023 12:56 am
- Forum: Hyundai/Kia
- Topic: Kia Niro BMS
- Replies: 146
- Views: 33960
Re: Kia Niro BMS
Thankyou for the clear explanation and help getting this up and running. I hopefully should be able to handle the coding for the additional contactor and economizer control myself. There are some thermistors in the pack in a couple of places handled directly by the micro on the BMS, im not sure how ...