question

irush avatar image

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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3 Answers
irush avatar image
irush answered ·

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

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wkirby avatar image
wkirby answered ·

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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kuban-invertor avatar image
kuban-invertor answered ·


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

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