# Combining 4 or more LiFePO4 batteries BMS data to Cerbo GX **URL:** \ **Category:** DIY\ **Tags:** 3-phase, pv\_inverter, bms, vrm, offgrid, diy\ **Created:** [4 October 2024 07:47 UTC](https://community.victronenergy.com/t/combining-4-or-more-lifepo4-batteries-bms-data-to-cerbo-gx/6312 "2024-10-04T07:47:06Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![Maarten](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@Maarten](https://community.victronenergy.com/u/Maarten)\ **Post date:** [15 December 2025 19:29 UTC](https://community.victronenergy.com/t/combining-4-or-more-lifepo4-batteries-bms-data-to-cerbo-gx/6312/21 "2025-12-15T19:29:27Z")
I want to do the same bit i can only use 2 usb ports on the Cerbo. How did you do it? ---
**Author:** ![HRVermeulen](https://avatars.discourse-cdn.com/v4/letter/h/90ced4/32.png) [@HRVermeulen](https://community.victronenergy.com/u/HRVermeulen)\ **Post date:** [25 August 2026 05:36 UTC](https://community.victronenergy.com/t/combining-4-or-more-lifepo4-batteries-bms-data-to-cerbo-gx/6312/22 "2026-08-25T05:36:54Z")
@Sten I know this post is rather old, but curious how you wired up your RBS. Do you use the relay in the Victron system to provide a pulse with power from the busbar / battery to turn it off in case of for example smoke detection? ---
**Author:** ![Sten](https://avatars.discourse-cdn.com/v4/letter/s/73ab20/32.png) [@Sten](https://community.victronenergy.com/u/Sten)\ **Post date:** [25 August 2026 11:14 UTC](https://community.victronenergy.com/t/combining-4-or-more-lifepo4-batteries-bms-data-to-cerbo-gx/6312/23 "2026-08-25T11:14:26Z")
The relay can be programmed to different situations. Take a look in the manual. my REC BMS is controlling the relay with one wire Mode 4. > **[TBS\_TBP\_Manual\_Rev5endf.pdf](https://tbs-electronics.com/wp-content/uploads/2025/06/TBS_TBP_Manual_Rev5endf.pdf)** > > 1361.60 KB [Previous page](https://community.victronenergy.com/t/combining-4-or-more-lifepo4-batteries-bms-data-to-cerbo-gx/6312.md?page=1)