# Expanding an existing installation to three phases

**URL:** <https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260>\
**Category:** DIY\
**Tags:** multiplus-ii, beginner, multiplus\
**Created:** [28 August 2026 15:17 UTC](https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260 "2026-08-28T15:17:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![heidelberger](https://avatars.discourse-cdn.com/v4/letter/h/b9e5f3/32.png) [@heidelberger](https://community.victronenergy.com/u/heidelberger)\
**Post date:** [28 August 2026 15:17 UTC](https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260/1 "2026-08-28T15:17:18Z")

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“I am expanding my system to three phases. My existing device has the serial number HQ2247… and firmware version 508. How can I get two new MultiPlus-II 48/5000/70-50 units that are hardware-compatible (processor type) with this device?”

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**Author:** ![nickdb](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/nickdb/32/51440_2.png) [@nickdb](https://community.victronenergy.com/u/nickdb)\
**Post date:** [28 August 2026 15:41 UTC](https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260/2 "2026-08-28T15:41:35Z")

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Hi. Have a read of the hardware compatibility ID section here: A decent supplier should know what to do. Please avoid the internet retailers..

> **[Parallel, split- and three-phase VE.Bus systems \[Victron Energy\]](https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems)**

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**Author:** ![Skipper](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/skipper/32/12055_2.png) [@Skipper](https://community.victronenergy.com/u/Skipper)\
**Post date:** [28 August 2026 18:06 UTC](https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260/3 "2026-08-28T18:06:21Z")

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Sell the one you have and buy 3 new ones from the same batch.

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**Author:** ![heidelberger](https://avatars.discourse-cdn.com/v4/letter/h/b9e5f3/32.png) [@heidelberger](https://community.victronenergy.com/u/heidelberger)\
**Post date:** [30 August 2026 10:50 UTC](https://community.victronenergy.com/t/erweiterung-einer-bestehenden-anlage-auf-3-phasen/62260/4 "2026-08-30T10:50:15Z")

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Thanks, that helps me.