BMV and discharge floor impact on SOC reading

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siletzspey asked Feb 20, '21

BMV and discharge floor impact on SOC reading

Section 3.4 of the Victron BMV-7xx manual says "The battery state of charge indicator scales between the configured discharge floor and 100% state of charge and reflects the effective state of charge."

Is this saying the discharge floor setting does impact the XX.X% SOC display and/or the battery-fill [====] display?

The BMV manual seems pretty clear that the "discharge floor" setting DOES impact the "time left" display. The BMV manual seems contradictory if the "discharge floor" setting impacts the SOC and battery-fill displays however.

Thanks,

--tg

BMV Battery Monitor SOC discharge level

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Answer 1 · 2021-02-20T07:35:36Z

seb71 answered · Feb 20, 2021 at 07:35 AM

The "discharge floor" setting only applies to "time to go/time remaining".

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siletzspey commented · Feb 20, 2021 at 05:37 PM

Hi seb71. Section 3.4 of the manual clearly says the "discharge floor" does influence the "state of charge indicator".

Having re-read the manual, the nuance appears to be that the LCD panel consists of a state of charge "display" showing nn.n% in the center, and a separate state of charge "indicator" showing [====] in the bottom right.

It seems the discharge floor influences the [====] "indicator" but not the nn.n% "display".

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seb71 siletzspey commented · Feb 20, 2021 at 06:33 PM

If you "scroll" (with +/- buttons) the display to SOC, it will show SOC (as a %). This is not influenced by the "discharge floor".

If you scroll the display to Time-to-go, it will show the time-to-go/remaining time (in h). This is influenced by the "discharge floor".

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Answer 2 · 2021-02-20T18:39:49Z

Stefanie (Victron Energy Staff) answered · Feb 20, 2021 at 06:39 PM

Hi @siletzspey,

the end of section 3.4 in the manual is a bit misleading or wrongly spelled. When I read the German (as a native German language speaker) language manual, it makes way more sense to me.

What is meant is the battery "indicator" in the bottom right hand corner. It measures the difference between the lowest set discharge floor and a 100% SOC and reflects the effective SOC. It's just a visual indicator based on discharge floor. Example: battery SOC is 100% - Discharge Floor is set to 50% - Indicator is showing all bars. Now battery SOC is down to 75% with the same discharge floor. Indicator will show only half of the bars. If that makes sense to you.

It has NO impact to the overall state of charge as shown in the numerical display.

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