question

esteban-moreno avatar image

Absorption to Float triggered at 40% or 60% of SoC (Multi + BMS + VE Smart Lithium LiFePo4 300ah Battery)

Multiplus is going from ABSORPTION to FLOAT charging state when the SoC is at 40% o 60%, which should actually been triggered when the battery is fully charge, if I'm not wrong.

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Multiplus settings are the recommended ones for Lithium batteries. So floating is at 13.5v and absorption is at 14.2v.

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- Could it be the Absorption time?


Any help would be really appreciate!!! thanks in advance to this great community.

Lithium Batteryfloat
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1641564806774.png (95.7 KiB)
1641564855094.png (76.4 KiB)
5 comments
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Adding the lapsus between the different charging states from today! It should be 1Hr of absorption and the 1hr of interval until the next absorption, right? thanks.

1641566997730.png (21.7 KiB)
Why are you not using the Smart Shunt as the battery Soc meter?
The smart shunt is in place! it shows 0.01 always, but actually it's passing the information on the advance reports in the VRM. Actually I search why it's showing like that and I did not found an actual explanation. Do you know what could it be?

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Here is the SHUNT information, which is the same SoC that is on the multiplus dashboard!

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It might be worth checking via remote console that the Smart shunt has been selected as the battery monitor.

Settings > system setup > battery monitor. Select Smart Shunt.

Which device should I use for Soc calculation?

1 Answer
rdcat avatar image
rdcat answered ·

Is your smartshunt correctly calibrated / zero'd?
If that voltage is wrong, then all else will be wrong
Multiple adsorbtion is bad for Lithium. less time is better.

If you have DC loads or solar, then the SOC meter (battery monitor) in the Multi should be OFF.

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