# off-Grid system being charge limited when a generator is ON

**URL:** <https://community.victronenergy.com/t/off-grid-system-being-charge-limited-when-a-generator-is-on/52147>\
**Category:** Q&A and troubleshooting\
**Tags:** pv\_inverter, cerbo\_gx, multiplus, diy, offgrid\
**Created:** [22 January 2026 14:35 UTC](https://community.victronenergy.com/t/off-grid-system-being-charge-limited-when-a-generator-is-on/52147 "2026-01-22T14:35:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RogelioFrioelectric](https://avatars.discourse-cdn.com/v4/letter/r/b3f665/32.png) [@RogelioFrioelectric](https://community.victronenergy.com/u/RogelioFrioelectric)\
**Post date:** [22 January 2026 14:35 UTC](https://community.victronenergy.com/t/off-grid-system-being-charge-limited-when-a-generator-is-on/52147/1 "2026-01-22T14:35:34Z")

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Hello, I have a problem with an off-grid system consisting of three Multiplus 24/3000/70 units with 24V 1650Ah OPzS battery, a 4.5kW Fronius Symo inverter, and a CerboGX.

Everything is connected, and the solar charges the battery, which discharges when there is no solar.

 ![image](https://europe1.discourse-cdn.com/victron/original/3X/7/f/7ffb7be93ff48872f37482b011f9ba4fd3413998.jpeg)

The charging on solar works correctly and it uses as much as it can to charge the battery

But when the Generator is running (This is a 7,4KW Generator), the charging current does not exceed 40A.

 ![image](https://europe1.discourse-cdn.com/victron/original/3X/7/b/7ba153f1ce33fd00e7acb50c4dec6871fb70e0ca.png)

Furthermore, when the generator is running but there is still solar power available, it seems that the solar energy is being used by the generator instead of the battery.

 ![image](https://europe1.discourse-cdn.com/victron/original/3X/f/b/fb7043d51303ad56e0073d855cbe7d27cde69c59.png)

On the multiplus is configured ESS and PowerAssist

this behavior is the same with the battery at 40% or at 88%

Do you know what might be wrong?

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**Author:** ![MikeD](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/miked/32/1522_2.png) [@MikeD](https://community.victronenergy.com/u/MikeD)\
**Post date:** [22 January 2026 18:29 UTC](https://community.victronenergy.com/t/off-grid-system-being-charge-limited-when-a-generator-is-on/52147/2 "2026-01-22T18:29:17Z")

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> [@RogelioFrioelectric](#):
>
> On the multiplus is configured ESS and PowerAssist

You should NEVER use ESS with off grid system.  
Exporting power to a generator can terminally damage the generator.

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<div class="post-metadata">

**Author:** ![RogelioFrioelectric](https://avatars.discourse-cdn.com/v4/letter/r/b3f665/32.png) [@RogelioFrioelectric](https://community.victronenergy.com/u/RogelioFrioelectric)\
**Post date:** [23 January 2026 06:49 UTC](https://community.victronenergy.com/t/off-grid-system-being-charge-limited-when-a-generator-is-on/52147/3 "2026-01-23T06:49:54Z")

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I deactivated Exporting to the grid on the Cerbo because of that,  
Before using ESS i was using “Support for FV inverter”, the behavior was the same

What do you think i should use instead os ESS?