Hi People,

i have been trying to find out how i can get the data out of my 3 eTowers batteries. Has anyone managed to connect their eTowers directly to the RaspberryPi with Solar Assistant?

Solar assistant is vague about whether they have a working RS232 to USB cable for these batteries. I see they have a RS485 cable which they say is not tested for mutliple packs and they even say if Inverter is connected to CAN, the RS484 connection will not work.

For more information, ETowers uses Pace BMS

Edited June 27, 20242 yr by Jakac
BMS type

I got this one working. It works for packs too. i currently have one pack connected that i am trying to bring close to others.

The cable required is in two parts.

Solar-assistant/pBMS2.5 Tools <-> usb to db9 serial <-> db9 serial to RJ11 <-> battery (master for all packs)

This cable -> https://www.takealot.com/mecer-usb-to-1-serial-9-pin-port/PLID35668474

Then you will need to get the db9 to RJ11 cable. I made one and also got one from Freedomwon. Both cables worked.

You can make the cable according to this spec https://www.freedomwon.co.za/wp-content/uploads/Freedom-Won-eTower-PBMS-Tools-April-2024.pdf

@SolarAssistant is it possible maybe to mass produce this can and sell it too. I can confirm it worked well with Solar Assistant and Freedomwon Etower. This cable connects to Pace BMS serial port RS232.