# ESS with 4th Multiplus on one Cerbo GX

**URL:** <https://community.victronenergy.com/t/ess-with-4th-multiplus-on-one-cerbo-gx/28667>\
**Category:** DIY\
**Tags:** gx\_device, cerbo\_gx, ess, diy\
**Created:** [12 April 2025 19:22 UTC](https://community.victronenergy.com/t/ess-with-4th-multiplus-on-one-cerbo-gx/28667 "2025-04-12T19:22:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ea7777777](https://avatars.discourse-cdn.com/v4/letter/e/bcef8e/32.png) [@ea7777777](https://community.victronenergy.com/u/ea7777777)\
**Post date:** [12 April 2025 19:22 UTC](https://community.victronenergy.com/t/ess-with-4th-multiplus-on-one-cerbo-gx/28667/1 "2025-04-12T19:22:15Z")

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Hi,  
I have an ESS with three Multiplus 2 in a three-phase system. . To charge the battery using a generator, I bought a fourth Multiplus and already installed it.

I read somewhere that I just need to plug the fourth Multiplus into the VE bus. If I do that, the other three Multipluses immediately go into error mode and disconnect the ESS. They only start up again when I unplug the fourth Multiplus.

Is this not possible and do I need a second Cerbo GX? Or is it configured false? In that case, how to configure it correctly?

Thanks!

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**Author:** ![DuivertNL](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/duivertnl/32/279_2.png) [@DuivertNL](https://community.victronenergy.com/u/DuivertNL)\
**Post date:** [12 April 2025 19:34 UTC](https://community.victronenergy.com/t/ess-with-4th-multiplus-on-one-cerbo-gx/28667/2 "2025-04-12T19:34:33Z")

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You can not connect it with ve bus, i have seen others using a usb mk3 cable to connect it to the cerbo, and seems to work for monitoring the multiplus

But it will stille be an unsupported configuration