# Multiplus II GX + CAN Battery + AC and DC solar charging + EVCS / Smartshunt YES or NO?

**URL:** <https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491>\
**Category:** DIY\
**Tags:** multiplus\_2\_gx\
**Created:** [21 December 2025 11:46 UTC](https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491 "2025-12-21T11:46:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bwouters](https://avatars.discourse-cdn.com/v4/letter/b/e480ec/32.png) [@bwouters](https://community.victronenergy.com/u/bwouters)\
**Post date:** [21 December 2025 11:46 UTC](https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491/1 "2025-12-21T11:46:40Z")

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Hello,

I have the below system with the Multiplus GX correctly communicating to my Dyness Battery over CAN Bus.

I do NOT have a smartshunt connected to the battery as I assumed the BMS from the battery communicates total load correctly over the CAN protocol to my Multiplus GX who displays it on the monitoring.

Can somebody confirm to me this is a correct assumption? (If I look at the below numbers I am missing +\_ 50W but to me thats possible due to various conversion losses)

 ![image](https://europe1.discourse-cdn.com/victron/original/3X/5/5/55ecfeed27c40e2bc3bd1c81fdb6d7aa1397c4c8.png)

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**Author:** ![mac](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mac](https://community.victronenergy.com/u/mac)\
**Post date:** [21 December 2025 17:54 UTC](https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491/2 "2025-12-21T17:54:24Z")

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> [@bwouters](#):
>
> I assumed the BMS from the battery communicates total load correctly

Depends on the BMS, in most cases a smartshunt is added for a more correct reading.

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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:** [22 December 2025 05:47 UTC](https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491/3 "2025-12-22T05:47:20Z")

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Typically a shunt is not needed with a bms controlled battery, select the battery bms as current monitor

The missing watts are a conversion and the multiplus its own needed power and also the vrm is “moment” view / calculation so never accurate

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**Author:** ![bwouters](https://avatars.discourse-cdn.com/v4/letter/b/e480ec/32.png) [@bwouters](https://community.victronenergy.com/u/bwouters)\
**Post date:** [22 December 2025 06:05 UTC](https://community.victronenergy.com/t/multiplus-ii-gx-can-battery-ac-and-dc-solar-charging-evcs-smartshunt-yes-or-no/50491/4 "2025-12-22T06:05:48Z")

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Thanks for clarifying. This is what I assumed indeed.