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rotevery asked

Are My Lithium Batteries Being Overcharged?

Here are the Victron solar generation and consumption charts for my solar system from April 22, 2023 to May 5, 2023, starting from state of battery all packs being fully charged (per the local display on each battery pack). I have Quattro, 2 x 100A Smart Solar MPPTs, 2 x 10kwh Felicitysolar battery packs, 1 x 15kwh Wakatek battery pack. All battery packs 48V in parallel. Each battery pack has in-built BMS. To avoid chance of overcharging, absorption voltage is set at 55.5V while float voltage was set at 54V (I've just now reduced float to 53.6V after the period under review). Total 35kwh (nominal) of LFP battery storage capacity. Why is the power stored in batteries by the Victron Smart Solar MPPT's far higher than the power drawn from the batteries (by much more than my battery storage capacity)? Are my batteries being overcharged?


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snoobler avatar image snoobler commented ·

Broken graphics.


Answer is no. :)

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rotevery answered ·

Found out that for low loads, the graphics power will not add up unless you select "has DC" to capture the self-consumption of the Quattro and other small DC loads. For my other site where I selected "has DC" the power calculations / graphics add up. When I remove "has DC" or when the "has DC" measurement becomes inaccurate due to addition of other battery measurements (smartshunts) to the VRM screen, et cetera, the power calculations/graphics no longer add up.

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