Communication between BYD Battery and Kostal Plenticore Inverter

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Mar 7, 2018
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Having just had a bit of a holly sh** moment... puzzling about 3 byte floats...

I started programming on a Z80 (Sharp MZ80K)... I started in the twilight zone !!
 

Korishan

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Jan 7, 2017
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6,527
Usually takes me longer than 3 bites to eat a float. I try to savoir the flavor, and not get an ice cream headache :p
 

huntworker

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Feb 16, 2021
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@huntworker, what is the final goal of this project? You want to build some monitoring system or connect some other battery to your inverter using this protocol.
I am trying to use a battery from an EV, maybe BMW i3 or even the tesla battery. i3 would be nice since the voltage is in a good range. With a Tesla battery I would need to use the whole pack with 60 to 100 kWh to have a good voltage, which might be a bit oversized. :D
So am trying to simulate the BYD battery for the existing Kostal inverter.
I also thought about using another inverter. I like the Victron pars for its uninterruptible power supply and fast transfer switches. But they are using only single phase concepts. So I would need 3x the MultiPlus || and the SmartSolar RS to have a tree phase system which lead to additional cost for the inverter of around 7 k€. With this system I would have the UPS but thats not worth it.

I am working as electrical engineer for a german company which builds cell management controller, battery management controller and battery junction boxes for different OEMs so I know what I am doing. :)
Only unusual thing for me is to not having a description of the protocols and buses.
 

yasko

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Nov 10, 2017
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OK. I got it. So, we are running on the same track here :) That is pretty similar to what I've done with a Goodwe inverter in my project.
BTW, I'm curious what do you think about this brand of inverters? They are well priced, and for about 1700-1800 euro, you can get a 10kW 3 phase HV hybrid inverter with UPS functionality.
 

huntworker

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Feb 16, 2021
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OK. I got it. So, we are running on the same track here :) That is pretty similar to what I've done with a Goodwe inverter in my project.
BTW, I'm curious what do you think about this brand of inverters? They are well priced, and for about 1700-1800 euro, you can get a 10kW 3 phase HV hybrid inverter with UPS functionality.
I didn't know Goodwe when I installed my setup.
In the meantime I got in touch with the 48V 3,6kW version GW 3648-EM which has quite interesting data. I like the home consumption measurement with its current transformers. In my case it was "more complicated" with the Kostal smart energy meter which does direct measurement, so all the current need to go though the device.
From technical data and for sure compared to the price, they are pretty good. I do not have any data for durability but expect them to be similar to others.

Your project is very similar to mine, respect for the work you did!
 

hopfi2k

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Jun 21, 2021
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Silent lurker here. Having read the thread with great interest. Wondering if this has materialised into a custom sort of "BYD-BMS-emulator"? Would love to know how this developed!
 

Jagganaut

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Jun 23, 2021
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I am trying to use a battery from an EV, maybe BMW i3 or even the tesla battery. i3 would be nice since the voltage is in a good range. With a Tesla battery I would need to use the whole pack with 60 to 100 kWh to have a good voltage, which might be a bit oversized. :D
So am trying to simulate the BYD battery for the existing Kostal inverter.
I also thought about using another inverter. I like the Victron pars for its uninterruptible power supply and fast transfer switches. But they are using only single phase concepts. So I would need 3x the MultiPlus || and the SmartSolar RS to have a tree phase system which lead to additional cost for the inverter of around 7 k€. With this system I would have the UPS but thats not worth it.

I am working as electrical engineer for a german company which builds cell management controller, battery management controller and battery junction boxes for different OEMs so I know what I am doing. :)
Only unusual thing for me is to not having a description of the protocols and buses.
It is exactly what i intend to install for our home location as well.
Multiple tesla modules are already here due to the fact, that we are reapiring hv-packs.
Before putting them again into real cars, my idea is to use them in our own pv-installation.
The boosttech BMS looks good from easy-installation perspective so i would like to bring these guys
into that thread to assist in that adoption into some piece of usable communication between the plenticores
and the battpack.
After that i would even consider to abandon our PowerWall2 from past referals.
@huntworker If you are located in germany maybe we can combine our efforts ... ;-)
 
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