DIYBMS v4

obinek · 2021-02-25T09:36:26.614Z

Yes Stuart, ambient temperature here in Nigeria is about 32°C midday

stuart · 2021-02-25T11:38:34.530Z

obinek:

Nigeria

Good to see diyBMS is travelling the world!

Chapulino · 2021-02-26T15:43:08.426Z

hi Stuart
For some 310Ah Lifepo4 batteries that I just bought, I am thinking of putting 2 or 3 modules per cell to triple the discharge capacity, going from 850mAh to 2.4Ah. does it make sense, or is it a nonsense?

stuart · 2021-02-26T19:26:43.380Z

It should work, although they may fight over each other as the voltage changes

stuart · 2021-02-27T10:16:25.078Z

3 posts were split to a new topic: Connections for ext temperature sensor

stuart · 2021-02-27T10:15:59.030Z

2 posts were split to a new topic: Optoisolator U2

intike · 2021-02-27T19:39:48.855Z

While my PCBs are not here yet, i have installed the firmware to the controller (Wemos D1 mini) and while the router see the DIY BMS controller (after given the user and password from the internet at 192.168.4.1), i can not log in yet with his ip adres shown in the router. Is it really necesary to have it plugged in in the controller to be able to log in??

machka · 2021-02-28T06:59:07.047Z

Hello from newbie,

First of all i would like to say thank you for such a great project which makes me excited. İ have completed payment jlcpcb 30 v4.2 modules and 5 controller. İ programmed controller and it works fine but due to pandemic i couldn’t get usbasp programmers for modules. İs there any change to program modules over d1 mini? Or any other advise? İ searched over internet but may be unlucky couldn’t find.

Thanks for all.

image1512×2016 1.17 MB

Chapulino · 2021-02-28T12:03:47.602Z

You could try programming an arduino, I’m not sure it can be done but you can investigate it, surely there is a lot of literature about it on the net I located this

roboticshelper.blogspot.com

Arduino as an usb asp programmer

Hello my name is ashish(ash) welcome to arduino as an usbasp programmer toutorial 1.get ur arduino and avr chip to be programmed r...

Nick81nrw · 2021-02-28T12:07:07.355Z

Hi all, I have since the beginning of 2020 the DIYBMS v4 in use, which was the first version that could be assembled via JLCPCB. In March I have loaded the controller with version 4.2, so I still have the white GUI. Now I wanted to update the controller. Do I have to update the boards as well?
By the way, the BMS runs like a charm, thanks again Stuart for the development

stuart · 2021-02-28T13:28:51.061Z

Nick81nrw:

Do I have to update the boards as well?

Yes, the latest code is a major change, so both module boards and controller need upgrading. The instructions are in GITHUB.

stuart · 2021-02-28T13:29:09.301Z

I’ve just launched a new version of the modules boards - v4.40

Heres a video all about them…

Chapulino · 2021-02-28T15:04:47.884Z

The idea of the included temperature module but that can be separated has seemed brilliant to me. I see that you have changed it to a 10k thermistor that is very easy to obtain and much cheaper than the 47K ohm ones, which I acquired for 4.21. I have already ordered the first 20 to test them. What discharge capacity does the 4.40 850mAh have as the 4.21 or does it have a little more?

stuart · 2021-02-28T15:16:00.242Z

Chapulino:

discharge capacity does the 4.40

CHIP RESISTOR - SURFACE MOUNT 3.3OHMS ±1% 3/4W 1210 ROHS,
4 in series with 4 in parallel gives 3.30 Ohm equivalent resistance
16 resistors provide 16*0.75W=12W of power disipation.
Balance current:

1.27A at 4.2V and 5.35W power
1.21A at 4.0V and 4.84W power
1.13A at 3.75V and 4.26W power

Sid1 · 2021-02-28T16:36:27.811Z

I still have 2 controllers and 14 modules over. Only the ATTINY 841 is missing from the modules.
If someone still needs some, I could give them away cheaply.
I wanted to build 2 power banks, but then decided to only use one.
I am from Germany.

IMG_20210228_16520913000×4000 2.34 MB

SOLD / Verkauft !

patalhetas · 2021-02-28T17:01:02.062Z

U are from ?

Sid1 · 2021-02-28T17:07:23.463Z

Germany
I’ll write that in my first post again, sorry I forgot

patalhetas · 2021-02-28T17:26:06.824Z

U want to sale all ?

Sid1 · 2021-02-28T17:47:44.696Z

yes, i don’t need the parts anymore

patalhetas · 2021-02-28T18:03:15.764Z

pm send