# Power loss and efficiency as a function of load (AC to DC / DC to AC) for MultiPlus-II 48/4K5 or 6K5

**URL:** <https://community.victronenergy.com/t/power-loss-and-efficiency-as-a-function-of-load-ac-to-dc-dc-to-ac-for-multiplus-ii-48-4k5-or-6k5/54857>\
**Category:** Q&A and troubleshooting\
**Tags:** multiplus-ii, diy\
**Created:** [13 March 2026 11:22 UTC](https://community.victronenergy.com/t/power-loss-and-efficiency-as-a-function-of-load-ac-to-dc-dc-to-ac-for-multiplus-ii-48-4k5-or-6k5/54857 "2026-03-13T11:22:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MichiR](https://avatars.discourse-cdn.com/v4/letter/m/838e76/32.png) [@MichiR](https://community.victronenergy.com/u/MichiR)\
**Post date:** [13 March 2026 11:22 UTC](https://community.victronenergy.com/t/power-loss-and-efficiency-as-a-function-of-load-ac-to-dc-dc-to-ac-for-multiplus-ii-48-4k5-or-6k5/54857/1 "2026-03-13T11:22:09Z")

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Are there more detailed informations available regarding power loss and efficiency of the new Multiplus II 48V 4k5 and 6k5, presented as a diagram or table, especially at lower loads for a 48 V battery?

- Loading battery from AC (AC to DC)
- Discharging battery to AC (DC to AC)

I think about information similar to that found for the older Multiplus models in this link?

[https://www.victronenergy.com/upload/documents/Output-rating-operating-temperature-and-efficiency.pdf](https://www.victronenergy.com/upload/documents/Output-rating-operating-temperature-and-efficiency.pdf)

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<div class="post-metadata">

**Author:** ![MichiR](https://avatars.discourse-cdn.com/v4/letter/m/838e76/32.png) [@MichiR](https://community.victronenergy.com/u/MichiR)\
**Post date:** [13 March 2026 11:27 UTC](https://community.victronenergy.com/t/power-loss-and-efficiency-as-a-function-of-load-ac-to-dc-dc-to-ac-for-multiplus-ii-48-4k5-or-6k5/54857/2 "2026-03-13T11:27:33Z")

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Ideally, a direct comparison between MultiPlus-II 48/5000 and 4k5 / 6k5.