dalathegreat / battery-emulator Goto Github PK

I have the problem that my Kostal Plenticore Plus can only process the BYD battery via the RS485 interface. Unfortunately, the byd modbus that is already included in the software does not work. what can I do?

First of All: Thanks for the great, great work.

today i uploaded the Software to LilyGo-Board. Everthing just fine.
But wenn ik open the Serial Monitor i only see weird characters.
Anyone else had this problem before and knows how to solve it?

Thanks in advance

Hi,
What would be need to be integrated with a JK BMS DIY battery?
What is the part I have to change in code?
I would like to connect the Fronius inverter with my ome brew batteries
and I would like to share it too.
Thnaks in advance!

It would be nice to limit charge/discharge power based on the battery temperature, e.g. ramping the power from the stated BMS power capacity at 40 degrees C to 0 W at 50 degrees C. Similarly at low temperature, ramp from BMS max power at -10 and 0 W at -20

I just wanted to throw this out there since I think the battery I want to add support for (ioniq 5) uses CAN-FD messages. I am still trying to get a working setup for this myself, but the hardware will need to support CAN-FD as well as the software.

thanks,
charles

Hi,

I would like to use the battery mentioned above with my Fronius GEN24 (I bought it together with a GoodWe inverter before I found this nice project :-( )
Any hints where I can find some more detailed documentation about the can-protocol (in addition to PYLON-CAN.h/cpp)?

Thanks!

Cheers
Nils

Evening all,

Is is possible to leave the battery in the car and use the LilyGo, some electronics to simulate the Chademo signals the correct solar inverter ( 50Hz, single phase <5kW, with the RS485 for me) and a Chademo cable. I know these can be bought, but not that available in the UK and pricey.

https://www.researchgate.net/figure/Flow-diagram-of-the-CHAdeMO-chagrining-protocol_fig4_319162700

Insulation test an issue!

https://www.thingiverse.com/thing:121581

Would have to make waterproof, more sturdy etc.

Thanks for your attention.

I am testing 5.2.0. MQTT battery voltage is 0V in my Home Assistant.

Seems to be a bug in the following line.

"battery_voltage" is an integer. Divide it by 10.0 resulting in no voltage data sent in my setup.

The following works for me since I am not interested in a voltage decimal.
((float)cell_min_voltage) / 1000, battery_voltage / 10);

Can anyone suggest the best way to source a Nissan Leaf 62 kWh battery in(to) Europe ?
Anyone experience importing new replacement battery packs them from China ?
e.g.
https://www.augenergy.com/index.php?route=product/product&path=61&product_id=79

With version 4.4.0 I have a SOH of 0%. Versions up to 4.3.0 We did not have this issue. It was hardcoded. But Is the current SOH correct?

The code at lines 59 to 65 of BYD-MODBUS.cpp which sets the value of bms_char_dis_status is not in SOLAX-CAN.cpp so the battery always shows as idle. Copying it into SOLAX-CAN.cpp around line 150 solves the problem but perhaps this code should be in NISSAN-LEAF-BATTERY.cpp anyway?

Hi!

I purchased a LilyGO, and is attempting to add this software to the board.

I use Arduino IDE on MacOS Big Sur, and I get this error while sending the software to the Board

Sketch uses 296717 bytes (22%) of program storage space. Maximum is 1310720 bytes.
Global variables use 83020 bytes (25%) of dynamic memory, leaving 244660 bytes for local variables. Maximum is 327680 bytes.
esptool.py v4.5.1
Serial port /dev/cu.usbmodem54FC0513701
Connecting......
Chip is ESP32-D0WDQ6-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 08:b6:1f:c0:df:b4
Uploading stub...

A fatal error occurred: Failed to write to target RAM (result was 01070000: Operation timed out)
Failed uploading: uploading error: exit status 2

I realize I haven't inserted any SD-Card, but as I understood it it should not be needed?

Nice job!

I like the LilyGo TCAN board as it seems to have everything needed apart from wired ethernet.

Question: Looking at the schematic it should be possible to power this board upto 16V (the absolute max for the on board regulator). The FET in line is capable with handling even more. So why the note that one shouldn't go beyond 12.3V?

https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/0bfb757dffda995c507f8ee7bad2773715c2ed87/Software/Software.ino#L230

should be

Serial2.begin(9600, SERIAL_8N1, RS485_RX_PIN, RS485_TX_PIN);

GitHub.docx
How do i Total the grand Total column to give me one number as now its showing individual totals.

Thanks

On my Leaf 62kWh battery, SOC and GIDS shows very strange values after a few days of running grid support services through Checkwatt. SOC/GIDS is suddenly not affected by slight charge/discharge (1A) while battery and cell voltage remains correct and increases with low rate charge/discharge as well as larger loads. SOC and GIDS only changes if charge/discharge rate is significant.

In my setup this leads to SOC/GIDS of around 65% while the true charge of the battery is at the full 96%. It also means the true SOC can be pushed outside the software set limits. Bad news on more than one level.

This issue likely occurs because of the way Checkwatt controls the battery SOC with Solax inverters. They always aim for 65% which means the battery is constantly changing between charge/discharge at a very low level to stay at 65% SOC (at the inverter). The leaf BMS does not like this and bugs out after a few days. A reboot of the BMS resets the SOC/GIDS values but might put the true SOC outside the configured limits which is not good.

We need to improve software checks to make this, and similar scenarios impossible. Some basic checks are in place. This will avoid bad battery failures but does not truly solve the problem as the battery will be put in fault mode until manually rebooted.
When installed in a car the BMS power is cut for two minutes every 24 hours.

A simple timer or otherwise controlled 12V input could reboot the BMS on a certain interval, e.g. break 12V power 1 minute every 24h. The software needs to handle this scenario correctly to make sure everything continues to operate after a reboot. I have not yet properly tested this approach but it should work without any large code additions.
I would like an integrated solution much like the contactor control. If using contactor control and dual can the lilygo is out of available pins. If dual can is not needed, I suggest "borrowing" on of those pins.
I'm working on an all-in-one hardware solution to replace the lilygo and I intend to make room for another 12V "channel" in addition to the three needed for contactor control.

The fault mode could be delayed with a software mod to make the 64-65-66% percent interval to be virtually larger but this is a very specific addition and most likely not useful in any other setups.

Values from battery
Real SOC%: 53% , GIDS: 355 (x77Wh) , Battery gen: 2 , Max cell voltage: 4152mV , Min cell voltage: 4119mV , Cell deviation: 33mV Values going to inverter
SOH%: 94% , SOC% scaled: 42% , Voltage: 396V , Max discharge power: 30000W , Max charge power: 11000W , Max temp: 22°C , Min temp: 21°C
BMS Status: Active, Idle, Power: -11880W

Hi Dala!

Great effort on this, is there anyway to help out and try to add support for Growatt Inverters?

I wonder why you're using a manual switch for A/B/C/D instead of a (cheap) 4 relay board to control them for the precharge/charge sequence?

You can't respect the tight timing with manual switch (hard to switch on and off in less than 0.3s).

Hi, it appears that Sungrow does not detect SOC and charging power when running even though the system recognizes the emulated battery.

Has anyone experienced anything similar? I can see the SOC, SOH and some voltage but the inverter does not display the power going to battery - but instead it lists it as house consumption (9kW consumption on forced charge).

Is there something missing in the communication when the Lily's expected to send something back to the inverter, causing all power from grid to be interpreted as consumption?

Hi Dala,

Apologies if this is the wrong forum to raise this issue but I have a AZE0 24kwh leaf battery and lilygo working and reporting to the fronius inverter.

I've been waiting for my installer to complete the upgrade to the gen24 plus from his end, so the battery hasn't been charging or discharging. Currently using the manual pre-charge, contactor method until the SSR arrive.

As of recent the lilygo is throwing error code 7, no matter the restart sequence. Do you know if this is an issue with the battery going into a sleep mode due to not seeing any discharge/charge for a week whilst being on and communicating?

I have also measured resistance when the 12v is off and the lilygo unpowered and it reads 60 ohm.

Edit:
Have opened the pack up and provided power, ground and connected to CAN direct and problem persist. Using a Link LX OBD2 reader and leafpsy yielded a CANBUS error and wouldn't connect either.
May actually be a dead LBC, will source a replacement and see if the problem persists.

Noting I had a car charger hooked up to a motorcycle battery which may have overcharged the little battery and in turn over volted the LBC.

Hi
regarding these defines
does anyone know how exactly the function of these features?
thx in advance

//#define CONTACTOR_CONTROL //Enable this line to have pins 25,32,33 handle automatic precharge/contactor+/contactor- closing sequence
//#define PWM_CONTACTOR_CONTROL /
//#define SERIAL_LINK_RECEIVER //Enable this line to receive battery data over RS485 pins from another Lilygo (This LilyGo interfaces with inverter)
//#define SERIAL_LINK_TRANSMITTER

i plan to use the battery as a house battery without solar, but charge when electricity is cheap and then use the battery when its expensive

what chargers can be used? i tried to look for a 3phase charger that ouputs 400v but they are hard to find, most are 48V or below

inverters.... are there any that accept the full pack voltage?

or do i have to reconfigure the battery for a lower voltage?

Not sure if it is intended or not?
Yes it is possible to change settings on the fly however upon reboot setting return to original coded values.
I don't see it as an issue, more as being useful for testing settings without recompiling and then once happy with settings, commit and recompile.

BTW great work

I have many errors and warnings when compiling the software.
Am i doing something wrong..
Attaching part of the compile result file.
Compile errors.txt

The CRC calcualtion returns 0 if you include the actual CRC which is normally the last byte.

uint8_t calc_crc8( uint8_t *data, uint8_t len ) {
	uint8_t crc = 0;
	uint8_t i;
	
	for ( i = 0; i < len; i++) {
		crc = crctable[ (crc ^ data[i]) ];
	}
	return crc;
}

The use case for checking a received frame of 8 bytes, could look like;

  case 0x1DB:
    if ( calc_crc(&rx_frame.data.u8[0], 8) ) {
      CANerror++;
      break; //Message content malformed, abort reading data from it
    }

instead of

  case 0x1DB:
    if(is_message_corrupt(rx_frame))
    {
      CANerror++;
      break; //Message content malformed, abort reading data from it
    }

BONUS
The use case for transmitting a frame thats requires a CRC, Like 0x50C which has a DLC of 6 to keep the SOC alive

LEAF_50C.data.u8[5] = calc_crc8( &LEAF_50C.data.u8[0], 5); //crc of bytes[ 0-4 ]

Note: This code is tested, but not in the arduino environment, it's in a Zilog chip :)
I've converted names etc to match your's hopefully I got them right.

Given that there is quite a good availability of second hand Tesla Model S & X battery packs and there has been experimented quite a lot with the individual cells I was wondering if it it’s possible to make it compatible with this solution.
I love the concept that a whole pack can stay intact with all the safety guards (E.g. pyro fuses) and am evaluating which packs to consider, this one is on top of my list.

I am seriously looking at buying a SunGrow SH10RS, single phase 10kW Hybrid, which are similar to other models you show as working.

I want to experiment with different batteries, different chemistries, different voltages, and so on. I'm fine with coding and electronics, CAN bus, modbus, BMS and high volt batteries. I have no experience with these Hybrid inverters and the "packaged batteries / powerwalls" like the BYD etc.

Question 1:

The Sungrow SH6.0RS has a Battery voltage range of 80 to 460V and a charge / discharge battery current of 30 Amp, and maximum power of 6600W. using the BYD emulator, Does the SG inverter care what the voltage is, as long as I stay within 80-460V? So is it responding only to SOC (and current maximums)? I may want a 150V batttery, or use different chemistries which will have different curves etc, and so on.

In the case of the SH10RS, it supports up to 50Amps max, which is beyond a single BYD HVM pack, will the inverter care if I set the emulator to 50 amps even though the std BYD HVM is max 30 Amps(if I remember right) ?

Question 2:

It is my understanding that the Fronius inverter and attached battery is Not isolated. Would any know if the SunGrow SHx.0RS inverters are isolated from the battery?

Flow chart for relay powering status indicates CAN messages to send at certain stages. Two issues:
1/ It is not made clear that 0x1D4 is the message with the signals
2/ There is a typo/lack of consistent terminology. Image states BTOFN, dbc file says BTONFN

https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Images/BatteryControlWiring.png

Looking for software to add leaf battery to a huawei sun2000 hybrid inverter

https://openinverter.org/wiki/Tesla_Model_3_Battery

Is there any way to intergrate into the tesla model 3 battery, I know ingen have a controller that has full control of the penthouse.

What would be required to emulate a BYD H or HVL batteries? I'd like to be able to use this with a SMA SBS6.0-US-10 inverter and SBS-ABU-200-US-10 / BUUM3-US-10 whole-home transfer switch in Canada. SMA details are here on approved equipment: https://files.sma.de/assets/275666.pdf. BYD documentation here: https://www.bydbatterybox.com/downloads#

Hi, I have issues connecting 485 communication to from liligo to sungrow hybrid inverer.
Has anyone experience from this?
Modbus Framesize errors when monitoring the communication..

PROBLEM

When an OTA update fails for some reason, onOTAEnd() doesn't seem to be called, resulting in that we stay in an "updating" state with no CAN. The communicated state to the inverter is also UPDATING, so it's happy even though we're not updating any values from the battery BMS.

STEPS TO REPRODUCE

Start an OTA update, disconnect from wifi on the sending computer

PROPOSAL FOR SOLUTION

Implement an OTA timeout independent of the onOTAxxx functions, that restores CAN or performs a reset

What if we want to contribute to add support for other batteries? How can we do that?

Example e golf

Hello Dala,
Thanks for sharing another nice project.
What do you think is it possible to use same approach and connect Leaf using CHAdeMO to Hybrid inverter as HV battery? in theory we would be able to charge Leaf with DC from panels, and use car for emergency backup. I must admit, that most expensive part will be the CHAdeMO plug :)

Hi all,

Just looking into the compatibility of emulating the BYD HVS battery with a GoodWe GW6000-EH via Canbus. Everything is hooked up as expected between the inverter and the LilyGo, simulating battery data until I can prove comms with the inverter.

I've scoped the canbus signal and have the following Goodwe inverter output shown below

0x151 00 47 4F 4F 44 57 45 00
0x191 04 04 00 17 00 01 04 00

I'm assuming the 0x151 signal should have a 0x01 in byte[0] but this doesn't seem to be the case. Has anyone come across this before? A box of beers for anyone who can steer me in the right direction!

Cheers

Any chance of getting the giv energy inverters added?

I have a gen 2 (GIV-HY3.6-G2) version and would like a leaf battery adding to it.

This project is amazing!

I have a Maxus eEdeliver 2022 battery pack, any information on that one available yet?

The CAN code is a bit strange on this board. If there is not someone alive on the CAN bus to ack the messages that the board sends, then the entire board will crash. The problem is that after the watchdog resets the board, the crash will continue to happen (since the code will try to send more CAN messages right away). After restoring the wires the board starts working again.

In proper CAN terminology, I believe this is called a BUS error state.

Steps to reproduce:

• Setup LilyGo board with a CAN device connected (I use Kvaser reader for testing)
• Setup terminating resistors to get 120Ohm in both ends (LilyGo has one built in)
• Start the program, for instance with "LEAF Battery" enabled.
• Observe how the green status LED on the board is blinking slowly, indicating that the board is alive
• Remove terminating resistor OR one CAN wire
• Intended behaviour: Board stays operational with pulsing green LED
• Actual behaviour: Board freezes up, the LED stays solid green on the board, indicating a crash

This isn't really a problem, since the Inverter that is connected should act accordingly and shut everything down in a CAN failure situation. But it would be very nice if the LilyGo could stay ON in this bus error state, since the board now can control contactors. In the event of CAN failure, after 60seconds the LilyGo enters faulted state, and in this state contactors are opened. So this bug is preventing this shutdown process from happening. Again, not a massive problem since the inverter will shut down the charge process.

Help wanted! :)

Hello,
Came across this project and looks great, giving it a try I am encountering an issue, firstly I am using Arduino IDE 2.2.1 and the latest version 4.1.0 of BYD-Battery-Emulator-For-Gen24, I have tried different battery / fake config by uncommenting choice in USER_SETTINGS.h and still receive the below error, have checked config.h in src/devboard and the pin assignments are present and correct, I believe there is probably something I need to do but cannot find any pointers any help would be welcome, thanks for any assistance:

C:\Users\Chris\Downloads\BYD-Battery-Emulator-For-Gen24-4.1.0\BYD-Battery-Emulator-For-Gen24-4.1.0\Software\src\lib\miwagner-ESP32-Arduino-CAN\CAN.c: In function 'CAN_init':
C:\Users\Chris\Downloads\BYD-Battery-Emulator-For-Gen24-4.1.0\BYD-Battery-Emulator-For-Gen24-4.1.0\Software\src\lib\miwagner-ESP32-Arduino-CAN\CAN.c:181:44: error: 'CAN_TX_IDX' undeclared (first use in this function)
181 | gpio_matrix_out(CAN_cfg.tx_pin_id, CAN_TX_IDX, 0, 0);
| ^~~~~~~~~~
C:\Users\Chris\Downloads\BYD-Battery-Emulator-For-Gen24-4.1.0\BYD-Battery-Emulator-For-Gen24-4.1.0\Software\src\lib\miwagner-ESP32-Arduino-CAN\CAN.c:181:44: note: each undeclared identifier is reported only once for each function it appears in
C:\Users\Chris\Downloads\BYD-Battery-Emulator-For-Gen24-4.1.0\BYD-Battery-Emulator-For-Gen24-4.1.0\Software\src\lib\miwagner-ESP32-Arduino-CAN\CAN.c:186:43: error: 'CAN_RX_IDX' undeclared (first use in this function)
186 | gpio_matrix_in(CAN_cfg.rx_pin_id, CAN_RX_IDX, 0);
| ^~~~~~~~~~

exit status 1

Compilation error: 'CAN_TX_IDX' undeclared (first use in this function)

Your definition is: static uint16_t battery_data[23];
But you are using indices from 0..23!
Greetings from Austria, I want to build a BYD replacement with single cells...

Reading the min/max temperature values out of the 0x5C0 CAN message only works for 2013-2017 LEAF battery packs. If you use a 2018+ battery, the mux will never trigger, and the default values 6.0C max and 5.0C min will be used. Needs fixing when someone starts to use 40/62kWh packs.

Can we make an option to disable the standard on AP in the webserver?

I have tested the following code and that seem to work:

#ifdef WEBSERVER_AP WiFi.mode(WIFI_AP_STA); // Simultaneous WiFi Access Point and WiFi STAtion init_WiFi_AP(); #endif #ifdef WEBSERVER_STA WiFi.mode(WIFI_STA); // Simultaneous WiFi Access Point and WiFi STAtion #endif

In "webserver.ccp" at line:
https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/8ff6209617a3f38cbfa252ecd06b2f5a0a9e945e/Software/src/devboard/webserver/webserver.cpp#L46C1-L48C33

And added these lines below in "USER_SETTINGS.h "#define WEBSERVER //Enable this line to enable WiFi, and to run the webserver" :
#define WEBSERVER_STA //Enable station that connects to WIFI //#define WEBSERVER_AP // Enable accesspoint when WEBSERVER is enabled.

I recently added initial support for Renault batteries, but this needs to be tested extensively. Please contact me if someone here is planning to use these batteries!

caeb52e

webserver.h defines bms_status and bms_char_dis_status as uint16_t but SOLAX-CAN.h defines them as uint8_t. Changing the type in webserver.h to uint8_t allows compilation for SOLAX-CAN but will not doubt break compilation for some other inverters

Hello,
first of all, I have to thank you for the perfect work.
So far I've only tried compiling in the IDE.
If I don't activate the webserver, it works fine.
If I activate the Webserver,
#define WEBSERVER
I get a compilation error:
In file included from BYD-Battery-Emulator-For-Gen24-main\Software\Software.ino:18:
BYD-Battery-Emulator-For-Gen24-main\Software\src\devboard\webserver\webserver.h:21:17: error: conflicting declaration 'uint16_t ms_status'
extern uint16_t bms_status; //Enum, 0-5
^~~~~~~~~~
In file included fromBYD-Battery-Emulator-For-Gen24-main\Software\src\inverter\INVERTERS.h:33,
from BYD-Battery-Emulator-For-Gen24-main\Software\Software.ino:9:
BYD-Battery-Emulator-For-Gen24-main\Software\src\inverter\SERIAL-LINK-TRANSMITTER-INVERTER.h:20:16: note: previous declaration as 'uint8_t bms_status'
extern uint8_t bms_status; //Enum, 0-5
^~~~~~~~~~
In file included from BYD-Battery-Emulator-For-Gen24-main\Software\Software.ino:18:
BYD-Battery-Emulator-For-Gen24-main\Software\src\devboard\webserver\webserver.h:22:17: error: conflicting declaration 'uint16_t bms_char_dis_status'
extern uint16_t bms_char_dis_status; //Enum, 0-2
^~~~~~~~~~~~~~~~~~~
In file included from BYD-Battery-Emulator-For-Gen24-main\Software\src\inverter\INVERTERS.h:33,
from BYD-Battery-Emulator-For-Gen24-main\Software\Software.ino:9:
BYD-Battery-Emulator-For-Gen24-main\Software\src\inverter\SERIAL-LINK-TRANSMITTER-INVERTER.h:21:16: note: previous declaration as 'uint8_t bms_char_dis_status'
extern uint8_t bms_char_dis_status; //Enum, 0-2
^~~~~~~~~~~~~~~~~~~

I don't dare to fix it.
How is that correct?

I still have one question:
If I define
#define SERIAL_LINK_TRANSMITTER
#define TESLA_MODEL_3_BATTERY
after connection, the BMS is activated.
If I connect the AC connector to the battery, will the AC charging work?

Thank you

In the readme you write: "You will also need a complete EV battery. See the battery compability list on which are supported." where is this list?

Battery power has the wrong value shown on the webpage.

Could the following line cause an overflow?

https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/430da0e0bd7f35e1cdde4469e814cecd5ef30641/Software/src/battery/TESLA-MODEL-3-BATTERY.cpp#L205C3-L205C68

Suggestion:

stat_batt_power = ( (volts/10) * amps);

Hi.
Acquiring this Fronius Gen24 is proving to be difficult in my area.
Has anyone tested this project with other types of inverters? Are there any alternative inverters that would be compatible? Any suggestions or shared experiences would be highly appreciated.

Problem description

The Fronius Gen24 (and other Fronius inverters also affected), will stop charge/discharge if the battery gets colder than -10°C. This is due to the original battery pack (BYD HVM), is a lithium iron phosphate battery, that cannot be charged in cold weather. When using NCM/LMO/NCA batteries, this is not a problem, since these chemistries are OK for outdoor cold use.

Suggested solution

We should freeze (pun intended), the values between -10 to -20°C, and fool the inverter that the battery is warmer than it actually is. Most EV packs have built in heaters, for instance the LEAF pack will turn the heat on at -17°C. This way we can still have a too cold shutdown at -20, which is a far more reasonable limit than -10. Incase you actually see -20°C with a LEAF pack, it means your heater has failed to kick in (and you should look into why)