# Controller and module compatibility

**URL:** <https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456>\
**Category:** diyBMS\
**Created:** [11 January 2023 05:49 UTC](https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456 "2023-01-11T05:49:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![garethb](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/g/858c86/32.png) [@garethb](https://community.openenergymonitor.org/u/garethb)\
**Post date:** [11 January 2023 05:49 UTC](https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456/1 "2023-01-11T05:49:54Z")

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Hi, I’m in need of some new modules so looking at ordering. I currently use the ESP8266 based controller with v4.21 modules.

Can I use the v4.5 (or 4.4 depending on parts) versions on the modules with the legacy controller?

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**Author:** ![JoshyJS](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/joshyjs/32/21270_2.png) [@JoshyJS](https://community.openenergymonitor.org/u/JoshyJS)\
**Post date:** [11 January 2023 12:07 UTC](https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456/2 "2023-01-11T12:07:05Z")

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Yes.

Do you need one?

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**Author:** ![garethb](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/g/858c86/32.png) [@garethb](https://community.openenergymonitor.org/u/garethb)\
**Post date:** [11 January 2023 23:19 UTC](https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456/3 "2023-01-11T23:19:50Z")

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Thanks @JoshyJS and mixing 4.21 modules with 4.5 modules wouldn’t be an issue I take it then?

I’m needing at least 4. Do you have spares?

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**Author:** ![JoshyJS](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/joshyjs/32/21270_2.png) [@JoshyJS](https://community.openenergymonitor.org/u/JoshyJS)\
**Post date:** [11 January 2023 23:54 UTC](https://community.openenergymonitor.org/t/controller-and-module-compatibility/22456/4 "2023-01-11T23:54:25Z")

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Stuart did not construct diffrend systems. All Versions are compatible.

I do not have futher PCBs. I changed to 1.9f and sold my 4.4 all.