BMV-712 Not showing Consumed Ah

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irush asked Mar 29, '19

BMV-712 Not showing Consumed Ah

My BMV-712 is installed and connected to a Battleborn 100Ah LiFeP04 Battery. It shows and records charge currents correctly, but during discharge (from the battery only) is shows current draw but the Consumed Ah remains at 0Ah and the Time remaining at infinite. This was tested over 24hrs with a 1.2A draw. After 24hrs, the consumed Ah remained at 0Ah and time remaining at infinite, and state of charge at 100%!!. I then connected shore power and charging began. Current (see picture below) showed -25.7A and Consumed Ah showed -11Ah with Time remaining at 1h 24m (remaining charge time). I have calibrated 0 current and sync'ed the fully charged state. I have only had 1 full discharge cycle, then lost all power as batt shutoff due to this issue, and now in a second discharge cycle.

Question is why no Consumed Ah displaying during discharge? Appears the HW is working and measuring.... Are multiple discharge cycles needed or ???

Two pictures attached from the app. First is battery discharging at 1.2A after 24 hours. Second is battery recharging after shore power plugged in.

Suggestions?

Thanks!

BMV Battery Monitor

bmv-batt-drawing.jpg (198.7 KiB)

bmv-charge.jpg (200.5 KiB)

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wkirby answered · Mar 29, 2019 at 04:48 PM

It seems to me that your shunt is wired back to front. Make sure the battery site goes on the BAT side and loads connect to the LOAD side.

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irush answered · Mar 29, 2019 at 06:11 PM

Appears to be "classic" battery cables reversed on Shunt connection! Self diagnosed!!

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Answer 1 · 2021-04-16T12:13:42Z

kuban-invertor answered · Apr 16, 2021 at 12:13 PM

Negative current values should indicate the discharge process, and without the minus sign, it means a charge

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Answer 2 · 2022-11-01T18:52:40Z

ollirita answered · Nov 01, 2022 at 06:52 PM

I know this is an old thread but mine just did the same thing. 1000W solar Victron MPPT and BMV-712 showing 0 Ah, although I have furnace, TV and lights on and running, MPPT shows around 7A draw and +39A Charge at around +500W. We changed the MPPT controller to a larger one, before that BMV was working fine.

First Picture has all the load side including solar charger and Victron smart battery monitor for temperature.

Nothing but battery negative connected to "Battery Only" side.

20221101-120114.jpg (544.3 KiB)

20221101-120119.jpg (478.5 KiB)

screenshot-20221031-115733.jpg (398.3 KiB)

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kevgermany ♦♦ commented · Nov 02, 2022 at 07:04 AM

Did you reprogram the battery settings? And has the system had a full charge since fitting the new battery.

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ollirita kevgermany ♦♦ commented · Nov 02, 2022 at 01:53 PM

Yes to both, using Victron Lifepo4 preprogrammed settings on the controller

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kevgermany ♦♦ ollirita commented · Nov 03, 2022 at 01:09 PM

Probably needed to see a full charge before it counts consumption.

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Answer 3 · 2022-11-02T17:02:42Z

ollirita answered · Nov 02, 2022 at 05:02 PM

Nevermind, this morning all is good. I guess the system had to reconfigure itself to the new controller.

Image Caption

screenshot-20221102-104857.jpg (320.1 KiB)

screenshot-20221102-105733.jpg (425.7 KiB)

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