DIY battery to Growatt high voltage (MOD 8000TL3-XH)

[tmlarsson]

Morning. I found this great project yesterday and started to wonder a bit about how the integration between a battery and an inverter actually works.

A bit of background. I have MOD 8000TL3-XH inverter but am reluctant to buy growatts battery as i recon 3000EUR (including swedish 50% grant) for 10kWh battery is quite expensive. Hence, I have been thinking about getting a victron system as I would be able to install 3 multiplus 3000 and 10kWh diy lifepo4 battery for the same amount (roughly).

However, in the meantime, getting a diy battery integrated into the growatt inverter would be awesome. I get that you can get the comminication between a bms and the inverter, but how would you make sure that the voltage input is in the accepted range?

As I understand, the ARK XH BMS block includes a dc-dc step up converter from ~48v to 400v. I would assume that this is still needed even if you managed to use your own 48v battery? Can we hack the ark xh bms block to accept e.g. a daly bms? That would be quite nice indeed.

[ai-republic]

Hi, it should be possible but you would need something hooked up after the BMSes which usually handle the 48V to step up the DC voltage to 400V. You'll need to research that :)

[LaurisK]

Hello everyone,
Are you sure about 48V DC - DC? To me it seems that this family uses 600-950V ARK or APX battery packs. since this topic is a bit interesting for me too. As I would like to connect self made battery pack to Growatt MOD 10KTL3-XH BP with not growat BMS/battery packs.

[romanbetwo]

Hi guys, "new to the pool" .. So I have growatt SPH10000 . I am running 3 LV batteries in serial- each 10kWh .. Its enough to wake up SPH and DC circuit and discharge/charge almost at 4kW ((52Vx3)*25A). I am currently running Lead Battery settings for SPH but it would be nice to have BMS communication , problem here is that growatt has Low Voltage Cut for lead acid at 12V max .. that means If battery goes down to this level underprotection of battery pops up and BMS (on each battery) will shut the battery down.

Each battery supports mulitple protocols including growatt LV CAN, but SPH 10000 is HV CAN. Can I be the test pilot for this one ?
Battery POWLAND has RS485 + CAN + RS232. Batteries have DIP switches config for "master battery and rest of pack"

I use Pi4 with 64b os
Waveshare USB CAN A (shows me cant open /dev/ttyUSB0 - inverter and /dev/ttyUSB1 - master BMS)

Goal here is (if its possible) sum all battery voltage + SOC and comm with SPH to be able to set SOC discharge and charge limits.
Current lead acid setup handles pretty good all 3 batteries are almost the same %SOC but sometimes it shut down due to undervoltage protection, as I mentioned LV cut on growatt is 10-12V for Lead acid

• to explain how this works
  12x 12V lead acid batteries in serie > 144V /enoughe to "wake" SPH
  is the same as 48x 3V Lifepo cells - but has different LVCut
  And also you have to play with max CV (charging voltage) to not exceed 160V .. there is a component on each LV BMS that will insta-short&break to protect the battery :)

I mean it survive like 90% of all time, but when consumption is high durring night - battery goes to 0 - UVP(under voltage protection) you need to manualy power it up.

mail me for more info - bee2twoo at gmail.com