DIYBMS v4

frbuceta · 2024-09-18T11:38:47.999Z

Hello community!

Does anyone know of a box to put the AIO inside and not have them in the air.

I bought this one for the controller on AliExpress but I can’t find it for the All In One modules.

Thanks in advance

ITman496 · 2024-09-20T23:25:44.227Z

EDIT: I reflashed the firmware to the one that is 4.5v ref and now its fine. I am guessing that it was assembled by stuart as a 4.5v but flashed with 4.096v ref firmware by mistake. All good now!

Hello! I just got a 4.90 all-in-one that I purchased off of the shopify page going. It appears to not be allowing me to calibrate it and is reading wrong… it reads 2.97 volts per cell when its actually 3.27v per cell. I’m not sure what I did wrong as these came pre-flashed from stuart directly…

They do not listen or respond to my calibration settings either which is a bit annoying, if I could set the multiplier to 1.095 then all would be good.

What do I do? I really hope I don’t have to pull it out of the enclosure as its incredibly tight where it is and would take a lot of work I was hoping to avoid…

stuart · 2024-09-21T13:05:23.941Z

Glad you got it working, the calibration function does work for the v4.9 modules as they shouldn’t need any calibration!

Sorry about the firmware mixup, I think a handful of modules went out like that.

ITman496 · 2024-09-21T14:02:19.350Z

Makes sense! And no worries, the issue wasn’t as hard to deal with as I was worried about. Now its only disagreeing with my fluke by 0.01v across the entire pack, so… I think pretty dang accurate!!

CzarofAK · 2024-10-04T13:42:56.608Z

Did anybody make a shrinked 4S diybms of the v490? or do you use just the “old” v450? The addon balancer is pretty tempting, but the board is oversized for 4S.

mrchar · 2024-10-16T05:07:33.270Z

Hello, I have used last firmware 240805 for 4.61 to start comm RS485 with Axpert King II 5kVA. It take aprox 1min to start comm, on inverter is blinking batery - this is OK, but

comm disapear after 30s on inverter is blinking error 61 - no comm with batery
in this short time invertor show almost full charged batery, in real it has 51V only (16pcs LiFePo), pylontech has 15 cells, right? It looks like invertor did not accept settings from DIYbms.

I use A and B on RS485, no ground
Invetor has 50.05 and 19.16 firmware if someone knows what can help

mrchar · 2024-10-17T06:51:17.618Z

I do not use external thermometer.
Can I break off temp sensor from module and use it as external?

mrchar · 2024-10-28T11:17:05.561Z

mrchar:

Hello, I have used last firmware 240805 for 4.61 to start comm RS485 with Axpert King II 5kVA. It take aprox 1min to start comm, on inverter is blinking batery - this is OK, but

comm disapear after 30s on inverter is blinking error 61 - no comm with batery

in this short time invertor show almost full charged batery, in real it has 51V only (16pcs LiFePo), pylontech has 15 cells, right? It looks like invertor did not accept settings from DIYbms.

I use A and B on RS485, no ground
Invetor has 50.05 and 19.16 firmware if someone knows what can help

The problem is solved. There were cable problem. I used cut ethernet cable - it has problem to communicate. I use shield plus 2 wires and it work now.

macgeeknz · 2024-10-31T01:33:03.280Z

Down here in New Zealand, I’ve just received fresh out of the parcel from JLC these boards beautiful in black soldermask I can confirm D1 was auto-placed incorrectly, however JLC spotted it and reached out to me to confirm which orientation was correct before we entered production, and so we flipped it 180 just in time.

To get through SMA without doing most of the fiddly stuff myself I had to sub in a couple of slightly different parts, incl changing voltage reference AZ432AN to the still-available AZ431L. Hopefully it works out ok!

I also subbed the LEDs for ones selected from the ‘basic parts’ library instead, to save the additional extended-parts fee for each type.

Now I get to tackle the attinys with my oversized 1990s iron!

Wish me luck…

PS, Stuart if you’re reading this, I hope you got the JLC affiliate creds on my order - I did order them from the /RSZ link, but when I tried to use the “JLC-Stuart” coupon code it said invalid code.

macgeeknz · 2024-10-31T01:44:21.963Z

I’ll try one more time to post these pics - I keep getting an error (maybe because I’m brand new here)…

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gazzaman2k · 2024-10-31T11:51:19.661Z

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so after about 4/5years ive had a failure on the diybms v4.2 a sandisk sd card burnt out stopping it from booting, this system has been on for 24/7 365days a year for like i say since it was released, just had to pop new sd card in (high endurance one this time) and off it went again

macgeeknz · 2024-10-31T19:31:23.486Z

gazzaman2k:

ive had a failure on the diybms v4.2 a sandisk sd card burnt out

Wow! I wonder what mode of failure caused that?!

SteveB1 · 2024-11-05T14:49:27.120Z

Does anybody know if you can connect to a Controller V4.6 without going via a router?
I would like to monitor the BMS on my phone but on my boat there is no WiFi network.
Can I connect to the the ESP32 via a local AP?

macgeeknz · 2024-11-05T18:53:09.002Z

SteveB1:

I would like to monitor the BMS on my phone but on my boat there is no WiFi network.
Can I connect to the the ESP32 via a local AP?

I don’t think the controller can do AP mode ( I’m a newbie though, so I may be wrong - please correct me if I am), but you could use a second ESP32 to provide that function on your boat without costing too much more or using much additional power.

Link: ESP32 Access Point (AP) for Web Server | Random Nerd Tutorials

I guess another option would be to add an LCD display, but I’m not sure if all the functionality is available from the local display or whether you need to additionally use a web client to get access to it all (others may be able to comment on this?).

SteveB1 · 2024-11-06T09:15:02.835Z

Thanks for your reply.
I’ll try adding an AP with a second ESP32 but that adds an additional power consumption to the existing load on the boat. Easy enough to set up and experiment / take some measurements.

jetronic · 2024-11-06T11:56:41.413Z

Hello everyone, there is also a new firmware with a Wifi fix.

One or the other has been affected by this, so try it out, it works well for me. No more reboots when the WLAN is off

GitHub

Release Release-2024-10-25-15-50 · stuartpittaway/diyBMSv4ESP32

Automatically generated release

Issue:

github.com/stuartpittaway/diyBMSv4ESP32

WIFI Issue - random reboot when STA is lost (investigation)

opened 11:39AM - 06 Feb 24 UTC

stuartpittaway

help wanted

This ticket is to investigate seemingly random reboots of the controller (often …related to also losing WIFI STA) with latest firmware version [Release-2023-12-27-12-02](https://github.com/stuartpittaway/diyBMSv4ESP32/releases/tag/Tag-2023-12-27-12-02) May be related to #239

macgeeknz · 2024-11-06T18:22:08.578Z

SteveB1:

I’ll try adding an AP with a second ESP32 but that adds an additional power consumption to the existing load on the boat.

Since overall power consumption is an important factor to you, you may want to consider these additional thoughts on the matter:

1 - the AP doesn’t have to be powered on all day; it only needs to be on whilst you’re using your phone to interrogate the battery (the battery will re-connect to the wifi when it comes back up, as will your phone).

2 - I haven’t don’t have any data to back up my claim, but I would imagine that if you’re only interrogating the battery from your phone for a short period a couple of times a day then the overall power consumption would actually be less than if the main controller supported AP mode and was broadcasting beacons all day long

Food for thought

SteveB1 · 2024-11-07T08:57:18.480Z

Thanks. My thoughts as well. Just need to switch on the AP when needed.
I’ve got a system working on an ESP 8266 (instead of an ESP 32) as this should use less power but I haven’t been able to test a 32 yet.

CzarofAK · 2024-11-07T16:39:41.507Z

Back to that question, what functionalities are disabled when i dont use a shunt? Can i still use the dynamic charge/discharge function to control the Cerbos DVCC?

CrAzYDr1veR · 2024-12-29T17:16:05.671Z

A long time ago i read here that you could not extend the lcd with a cable because of interference, well it actually works so if you need it you can do it.

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